Mitsubishi UFJ Financial (MUFG) 6-K 11 Jan 19 2018 H1 Current report (foreign) Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Sep. 30, 2018
Document And Entity Information [Abstract]
Document Type	6-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	H1
Trading Symbol	MUFG
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, 2018	Mar. 31, 2018
ASSETS
Cash and due from banks		¥ 35,663,868	¥ 32,648,387
Interest-earning deposits in other banks		39,157,102	43,209,662
Cash, due from banks and interest-earning deposits in other banks		74,820,970	75,858,049
Call loans, funds sold, and receivables under resale agreements		12,143,047	6,622,281
Receivables under securities borrowing transactions		3,113,172	9,268,756
Trading account assets (including assets pledged that secured parties are permitted to sell or repledge of ¥6,558,587 and ¥6,644,591 at March 31, 2018 and September 30, 2018) (including ¥15,007,706 and ¥14,615,221 at March 31, 2018 and September 30, 2018 measured at fair value under fair value option)		36,087,519	35,186,689
Investment securities:
Available-for-sale debt securities (including assets pledged that secured parties are permitted to sell or repledge of ¥11,358,439 and ¥8,489,557 at March 31, 2018 and September 30, 2018)		31,162,510	32,833,114
Held-to-maturity debt securities (including assets pledged that secured parties are permitted to sell or repledge of ¥414,857 and ¥537,098 at March 31, 2018 and September 30, 2018) (fair value of ¥3,620,672 and ¥4,198,492 at March 31, 2018 and September 30, 2018)		4,187,966	3,582,941
Equity securities (including assets pledged that secured parties are permitted to sell or repledge of ¥1,650 and ¥1,505 at March 31, 2018 and September 30, 2018) (including ¥6,699,943 and ¥7,063,987 at March 31, 2018 and September 30, 2018 measured at fair value)		7,605,948	7,238,194
Total investment securities		42,956,424	43,654,249
Loans, net of unearned income, unamortized premiums and deferred loan fees (including assets pledged that secured parties are permitted to sell or repledge of ¥898,186 and ¥849,589 at March 31, 2018 and September 30, 2018)	[1]	117,663,232	117,035,895
Allowance for credit losses		(634,609)	(764,124)
Net loans		117,028,623	116,271,771
Premises and equipment-net		1,000,835	1,013,588
Accrued interest		352,113	324,624
Customers' acceptance liability		209,314	183,084
Intangible assets-net		1,021,853	1,011,119
Goodwill		431,155	441,334
Deferred tax assets		67,603	68,704
Other assets		10,891,622	10,666,064
Total assets		300,124,250	300,570,312
LIABILITIES AND EQUITY
Deposits: Domestic offices, Non-interest-bearing		24,231,019	24,406,759
Deposits: Domestic offices, Interest-bearing		122,896,999	125,195,310
Deposits: Overseas offices, principally interest-bearing		45,750,803	46,072,524
Total deposits		192,878,821	195,674,593
Call money, funds purchased, and payables under repurchase agreements		27,948,501	20,587,137
Payables under securities lending transactions		1,900,033	8,170,218
Due to trust account and other short-term borrowings (including ¥264,783 and ¥241,320 at March 31, 2018 and September 30, 2018 measured at fair value under fair value option)		10,193,094	10,267,282
Trading account liabilities		11,825,979	12,222,331
Obligations to return securities received as collateral		3,427,158	3,176,962
Bank acceptances outstanding		209,314	183,084
Accrued interest		192,090	165,921
Long-term debt (including ¥333,985 and ¥355,154 at March 31, 2018 and September 30, 2018 measured at fair value under fair value option)		27,881,157	27,069,556
Other liabilities		7,718,464	7,407,413
Total liabilities		284,174,611	284,924,497
Commitments and contingent liabilities
Mitsubishi UFJ Financial Group shareholders' equity:
Capital stock-common stock authorized, 33,000,000,000 shares; common stock issued, 13,900,028,020 shares and 13,827,607,320 shares at March 31, 2018 and September 30, 2018, with no stated value		2,090,270	2,090,270
Capital surplus		5,685,427	5,740,165
Retained earnings:
Appropriated for legal reserve		239,571	239,571
Unappropriated retained earnings		8,071,376	4,945,733
Accumulated other comprehensive income, net of taxes		(272,240)	2,477,315
Treasury stock, at cost-737,772,882 common shares and 745,634,063 common shares at March 31, 2018 and September 30, 2018		(528,271)	(522,872)
Total Mitsubishi UFJ Financial Group shareholders' equity		15,286,133	14,970,182
Noncontrolling interests		663,506	675,633
Total equity		15,949,639	15,645,815
Total liabilities and equity		300,124,250	300,570,312
Consolidated VIEs [Member]
ASSETS
Cash and due from banks		3,366	130
Interest-earning deposits in other banks		18,601	23,161
Trading account assets (including assets pledged that secured parties are permitted to sell or repledge of ¥6,558,587 and ¥6,644,591 at March 31, 2018 and September 30, 2018) (including ¥15,007,706 and ¥14,615,221 at March 31, 2018 and September 30, 2018 measured at fair value under fair value option)		446,481	477,583
Investment securities:
Total investment securities		1,964,307	1,952,683
Net loans		16,127,864	16,550,107
All other assets		217,976	187,329
Total assets		18,778,595	19,190,993
LIABILITIES AND EQUITY
Total deposits
Other short-term borrowings		16,401	28,451
Long-term debt (including ¥333,985 and ¥355,154 at March 31, 2018 and September 30, 2018 measured at fair value under fair value option)		524,478	510,948
All other liabilities		99,091	84,040
Total liabilities		¥ 639,970	¥ 623,439
[1]	The above table includes loans held for sale of ¥226,923 million at March 31, 2018 and ¥238,564 million at September 30, 2018, respectively.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - JPY (¥) ¥ in Millions	Sep. 30, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Trading account assets pledged that secured parties are permitted to sell or repledge	¥ 6,644,591	¥ 6,558,587
Trading account assets measured at fair value under fair value option	14,615,221	15,007,706
Available-for-sale debt securities pledged that secured parties are permitted to sell or repledge	8,489,557	11,358,439
Held-to-maturity debt securities pledged that secured parties are permitted to sell or repledge	537,098	414,857
Held-to-maturity debt securities, Fair value	4,198,492	3,620,672
Equity securities pledged that secured parties are permitted to sell or repledge	1,505	1,650
Equity securities measured at fair value	7,063,987	6,699,943
Loans, net of unearned income, unamortized premiums and deferred loan fees, pledged that secured parties are permitted to sell or repledge	849,589	898,186
Due to trust account and other short-term borrowings measured at fair value under fair value option	241,320	264,783
Long-term debt measured at fair value under fair value option	¥ 355,154	¥ 333,985
Common stock, authorized	33,000,000,000	33,000,000,000
Common stock, issued	13,827,607,320	13,900,028,020
Common stock, stated value
Treasury stock, shares	745,634,063	737,772,882

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - JPY (¥) shares in Thousands, ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Interest income:
Loans, including fees		¥ 1,236,933	¥ 1,098,107
Deposits in other banks		83,569	57,768
Investment securities		201,580	185,852
Trading account assets		233,857	224,262
Call loans, funds sold, and receivables under resale agreements and securities borrowing transactions		62,959	36,109
Total		1,818,898	1,602,098
Interest expense:
Deposits		323,884	240,723
Call money, funds purchased, and payables under repurchase agreements and securities lending transactions		142,906	72,657
Due to trust account, other short-term borrowings, and trading account liabilities		73,942	41,919
Long-term debt		145,113	126,553
Total		685,845	481,852
Net interest income		1,133,053	1,120,246
Reversal of credit losses		71,060	186,568	[1]
Net interest income after reversal of credit losses		1,204,113	1,306,814
Non-interest income:
Fees and commissions income		705,438	701,916
Foreign exchange losses-net		(99,407)	(3,025)
Trading account profits (losses)-net		(332,431)	69,428
Investment securities gains-net	[2],[3]	422,998	176,149	[1]
Equity in earnings of equity method investees-net		140,014	88,717	[1]
Other non-interest income		63,078	44,282
Total		899,690	1,077,467
Non-interest expense:
Salaries and employee benefits		577,915	568,320
Occupancy expenses-net		88,484	88,567
Fees and commissions expenses		155,522	146,625
Outsourcing expenses, including data processing		137,912	136,326
Depreciation of premises and equipment		44,664	46,159
Amortization of intangible assets		114,484	116,878
Impairment of intangible assets		667	16,591	[1]
Insurance premiums, including deposit insurance		46,696	45,103
Communications		29,557	28,158
Taxes and public charges		51,786	45,152
Other non-interest expenses		160,349	131,968
Total		1,408,036	1,369,847
Income before income tax expense		695,767	1,014,434
Income tax expense		143,212	234,336
Net income before attribution of noncontrolling interests		552,555	780,098	[1]
Net loss attributable to noncontrolling interests		(696)	(10,606)
Net income attributable to Mitsubishi UFJ Financial Group		553,251	790,704
Income used for the computation of basic EPS and diluted EPS (Numerator):
Net income attributable to Mitsubishi UFJ Financial Group		553,251	790,704
Effect of dilutive instruments:
Stock acquisition rights, performance-based plan under the Board Incentive Plan and restricted stock units	[4]	(1,962)	(1,951)
Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group and assumed conversions		¥ 551,289	¥ 788,753
Shares used for the computation of basic EPS and diluted EPS (Denominator):
Weighted average common shares outstanding		13,123,663	13,354,885
Effect of dilutive instruments:
Stock acquisition rights and the common shares of MUFG under the Board Incentive Plan	[4]	484	1,964
Weighted average common shares for diluted computation		13,124,147	13,356,849
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		¥ 42.16	¥ 59.21
Diluted earnings per common share-Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group	[4]	42.01	59.05
Cash dividend per common share		¥ 10	¥ 9
[1]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.
[2]	New guidance on recognition and measurement of financial assets and financial liabilities requires equity investments to be measured at fair value with changes in fair value recognized in net income in six months ended on September 30, 2018. For additional information, refer to Note1.
[3]	The following credit losses are included in Investment securities gains-net: Decline in fair value by ¥95 million and ¥81 million; Other comprehensive income-net by ¥13 million and ¥4 million; Total credit losses by ¥108 million and ¥85 million, for the six months ended September 30, 2017 and 2018, respectively.
[4]	For the six months ended September 30, 2018, the performance-based plan under the Board Incentive Plan could potentially dilute earnings per common share but were not included in the computation of diluted earnings per common share due to their antidilutive effects.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income (Unaudited) (Parenthetical) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Decline in fair value	¥ 81	¥ 95
Other comprehensive income-net	4	13
Total credit losses	¥ 85	¥ 108

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income before attribution of noncontrolling interests		¥ 552,555	¥ 780,098	[1]
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on investment securities	[2]	(74,345)	247,454
Net debt valuation adjustments		(2,226)	(5,779)
Net unrealized losses on derivatives qualifying for cash flow hedges		(6,843)	(626)
Defined benefit plans		16,495	24,609
Foreign currency translation adjustments		25,649	(35,925)
Total		(41,270)	229,733
Comprehensive income		511,285	1,009,831
Net loss attributable to noncontrolling interests		(696)	(10,606)
Other comprehensive income (loss) attributable to noncontrolling interests		6,043	(3,586)
Comprehensive income attributable to Mitsubishi UFJ Financial Group		¥ 505,938	¥ 1,024,023
[1]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.
[2]	Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018.

Condensed Consolidated Statem_4

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, 2017			¥ 2,090,270	¥ 5,956,644	¥ 239,571	¥ 3,931,612	¥ 2,281,423	¥ (513,988)	¥ 779,176
Stock-based compensation				(2,802)
Net income attributable to Mitsubishi UFJ Financial Group	¥ 790,704					790,704
Cash dividends: Common stock-¥9.00 per share and ¥10.00 per share in 2017 and 2018						(120,906)
Losses on sales of shares of treasury stock						(8)
Purchases of shares of treasury stock								(101,028)
Sales of shares of treasury stock								2,029
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
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)					(15,390)
Net loss attributable to noncontrolling interests	(10,606)								(10,606)
Dividends paid to noncontrolling interests									(6,810)
Net change during the period, Other comprehensive income (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
Balance at beginning of period at Mar. 31, 2018	15,645,815		2,090,270	5,740,165	239,571	4,945,733	2,477,315	(522,872)	675,633
Stock-based compensation				(3,247)
Net income attributable to Mitsubishi UFJ Financial Group	553,251					553,251
Cash dividends: Common stock-¥9.00 per share and ¥10.00 per share in 2017 and 2018						(131,634)
Purchases of shares of treasury stock								(60,721)
Sales of shares of treasury stock								3,730
Retirement of common stock				(51,527)				51,527
Net decrease resulting from changes in interests in consolidated subsidiaries, consolidated variable interest entities, and affiliated companies								65
Initial subscriptions of noncontrolling interests									8,682
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders									7,186
Increase (decrease) in noncontrolling interests related to deconsolidation of subsidiaries									(21,213)
Net loss attributable to noncontrolling interests	(696)								(696)
Dividends paid to noncontrolling interests									(12,176)
Net change during the period, Other comprehensive income (loss), net of taxes	(41,270)						(47,313)		6,043
Other-net				36					47
Balance at end of period at Sep. 30, 2018	¥ 15,949,639	¥ 15,286,133	¥ 2,090,270	¥ 5,685,427	¥ 239,571	8,071,376	(272,240)	¥ (528,271)	¥ 663,506
Effect of adopting new guidance | Recognition and Measurement of Financial Assets and Financial Liabilities [Member]						2,702,242	¥ (2,702,242)
Effect of adopting new guidance | Recognition of Breakage for Certain Prepaid Stored-Value Products [Member]						¥ 1,784

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Equity (Unaudited) (Parenthetical) - ¥ / shares	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash dividends: Common stock, per share	¥ 10	¥ 9
Mitsubishi UFJ Financial Group Shareholders' Equity [Member] | Unappropriated Retained Earnings [Member]
Cash dividends: Common stock, per share	¥ 10	¥ 9

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows (Unaudited) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income before attribution of noncontrolling interests		¥ 552,555	¥ 780,098	[1]
Adjustments to reconcile net income before attribution of noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization		159,148	163,037	[1]
Impairment of intangible assets		667	16,591	[1]
Reversal of credit losses		(71,060)	(186,568)	[1]
Investment securities gains-net	[2],[3]	(422,998)	(176,149)	[1]
Foreign exchange losses (gains)-net		360,395	(152,647)	[1]
Equity in earnings of equity method investees-net		(140,014)	(88,717)	[1]
Provision for deferred income tax expense		68,680	76,774	[1]
Decrease in trading account assets, excluding foreign exchange contracts		73,602	2,413,956	[1]
Decrease in trading account liabilities, excluding foreign exchange contracts		(493,461)	(3,197,859)	[1]
Increase in accrued interest receivable and other receivables		(80,162)	(67,375)	[1]
Decrease in accrued interest payable and other payables		(45,948)	(28,880)	[1]
Net increase (decrease) in accrued income taxes and decrease (increase) in income tax receivables		(86,561)	15,428	[1]
Increase in collateral for derivative transactions		(546,434)	(508,732)	[1]
Increase in cash collateral for the use of Bank of Japan's settlement infrastructure		(60,462)	(430,802)	[1]
Other-net		6,097	(304,979)	[1]
Net cash used in operating activities		(725,956)	(1,676,824)	[1]
Cash flows from investing activities:
Proceeds from sales and maturities of Available-for-sale debt securities (including proceeds from sales of debt securities under the fair value option)		29,447,103	36,345,499	[1]
Purchases of Available-for-sale debt securities (including purchases of debt securities under the fair value option)		(27,222,037)	(35,755,864)	[1]
Proceeds from maturities of Held-to-maturity securities		377,310	670,897	[1]
Purchases of Held-to-maturity securities		(723,414)	(352,035)	[1]
Proceeds from sales and redemption of Equity securities (including proceeds from sales of equity securities under the fair value option)		1,069,888	1,176,962	[1]
Purchases of Equity securities (including purchases of equity securities under the fair value option)		(1,264,444)	(922,551)	[1]
Purchase of common stock in Bank Danamon, an equity method investee of BK		(132,335)
Net decrease in loans		507,521	485,079	[1]
Net decrease in call loans, funds sold, and receivables under resale agreements and securities borrowing transactions		289,196	2,602,481	[1]
Capital expenditures for premises and equipment		(60,694)	(72,807)	[1]
Purchases of intangible assets		(135,962)	(112,037)	[1]
Proceeds from sales of consolidated VIEs and subsidiaries-net		51,775	43,371	[1]
Other-net		58,278	(23,554)	[1]
Net cash provided by investing activities		2,262,185	4,085,441	[1]
Cash flows from financing activities:
Net increase (decrease) in deposits		(3,513,570)	718,227	[1]
Net increase in call money, funds purchased, and payables under repurchase agreements and securities lending transactions		583,900	1,189,329	[1]
Net decrease in due to trust account		(357,394)	(247,230)	[1]
Net increase in other short-term borrowings		221,701	340,236	[1]
Proceeds from issuance of long-term debt		2,767,744	3,340,765	[1]
Repayments of long-term debt		(2,295,485)	(1,448,268)	[1]
Proceeds from sales of treasury stock		2,270	1,219	[1]
Dividends paid		(131,654)	(120,911)	[1]
Payments for acquisition of treasury stock		(59,640)	(101,028)	[1]
Other-net		(32,406)	(57,792)	[1]
Net cash provided by (used in) financing activities		(2,814,534)	3,614,547	[1]
Effect of exchange rate changes on cash and cash equivalents		233,918	84,952	[1]
Net increase (decrease) in cash and cash equivalents		(1,044,387)	6,108,116	[1]
Cash and cash equivalents at beginning of period		75,873,456	64,019,219	[1]
Cash and cash equivalents: Cash, due from banks and interest-earning deposits in other banks		74,820,970	70,115,508	[1]
Cash and cash equivalents: Restricted cash included in other assets		8,099	11,827	[1]
Cash and cash equivalents at end of period		74,829,069	70,127,335	[1]
Cash paid during the period for:
Interest		658,461	480,203	[1]
Income taxes, net of refunds		153,902	134,396	[1]
Non-cash investing and financing activities:
Assets acquired under capital lease arrangements		¥ 2,733	3,045	[1]
Purchase of shares of Mitsubishi UFJ NICOS from noncontrolling interest shareholder
Increase in other liabilities	[1]		50,000
Decrease in noncontrolling interests	[1]		15,390
Decrease in capital surplus	[1]		34,751
Increase in accumulated other comprehensive income, net of taxes	[1]		¥ 141
[1]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.
[2]	New guidance on recognition and measurement of financial assets and financial liabilities requires equity investments to be measured at fair value with changes in fair value recognized in net income in six months ended on September 30, 2018. For additional information, refer to Note1.
[3]	The following credit losses are included in Investment securities gains-net: Decline in fair value by ¥95 million and ¥81 million; Other comprehensive income-net by ¥13 million and ¥4 million; Total credit losses by ¥108 million and ¥85 million, for the six months ended September 30, 2017 and 2018, respectively.

Basis of Semiannual Condensed C

Basis of Semiannual Condensed Consolidated Financial Statements [Text Block]	6 Months Ended
	Sep. 30, 2018
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 MUFG Bank, Ltd. (formerly, The Bank of Tokyo-Mitsubishi UFJ, Ltd., “MUFG Bank” or “BK”), Mitsubishi UFJ Trust and Banking Corporation (“Mitsubishi UFJ Trust and Banking” or “TB”), Mitsubishi UFJ Securities Holdings Co., Ltd. (“Mitsubishi UFJ Securities Holdings” or “SCHD”), Mitsubishi UFJ NICOS Co., Ltd. (“Mitsubishi UFJ NICOS”), and other subsidiaries. Mitsubishi UFJ Securities Holdings is an intermediate holding company for Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. (“Mitsubishi UFJ Morgan Stanley Securities”). 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 17 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, 2018. 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. Reclassifications Certain reclassifications and format changes have been made to the prior period condensed consolidated financial statements to conform to the presentation for the six months ended September 30, 2018. These reclassifications and format changes include 1) the reclassifications of interest expense from “Long-term debt” to “Payables under repurchase agreements and securities lending transactions” within interest expense in the condensed consolidated statements of income, and cash flows from “Proceeds from issuance of long-term debt” and “Repayments of long-term debt” to “Net increase (decrease) in call money, funds purchased, and payables under repurchase agreements and securities lending transactions” in cash flows from financing activities in the condensed consolidated statements of cash flows, in relation to the reclassification of long-term repurchase agreements from “Long-term debt” to “Payables under repurchase agreements” in the condensed consolidated balance sheets that were made in the second half of the fiscal year ended March 31, 2018, and 2) reclassifications of equity investment securities from “Available-for-sale Available-for-sale Held-to-maturity Available-for-sale Available-for-sale Accounting Changes Restricted Cash beginning-of-period end-of-period Revenue from Contracts with Customers— Recognition and Measurement of Financial Assets and Financial Liabilities— available-for-sale Recognition of Breakage for Certain Prepaid Stored-Value Products— non-financial Classification of Certain Cash Receipts and Cash Payments— Intra-Entity Transfers of Assets Other Than Inventory— Clarifying the Definition of a Business Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Improving t he Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost non-service Scope of Modification Accounting Recently Issued Accounting Pronouncements Leases— right-of-use gross-up right-of-use gross-up Measurement of Credit Losses on Financial Instruments available-for-sale Simplifying the Test for Goodwill Impairment Premium Amortization on Purchased Callable Debt Securities Targeted Improvements to Accounting for Hedging Activities Improvements to Nonemployee Share-Based Payment Accounting Disclosure Framework Changes to the Disclosure Requirements for Fair Value Measurement Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans Customer ’ s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract— internal-use internal-use internal-use capitalized-implementation-cost-related Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes

Business Developments _Text Blo

Business Developments [Text Block]	6 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Business Developments [Text Block]	2. BUSINESS DEVELOPMENTS 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, on October 2, 2017, 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 Acquisition of shares in Bank Danamon in Indonesia On December 26, 2017, MUFG Bank 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. MUFG Bank 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 MUFG Bank 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 MUFG Bank will be executed through three steps (the “Proposed Transaction”), and the completion of the Proposed Transaction will result in MUFG Bank becoming the largest shareholder in Danamon and Danamon becoming a consolidated subsidiary of MUFG Bank. In Step 1, MUFG Bank 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) (1) Available-for-sale In Step 2, MUFG Bank acquired an additional 20.1% equity interest in Danamon from the Sellers on August 3, 2018, based on a price of IDR 8,921 (approximately ¥69 (2) (2) In Step 3, MUFG Bank 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 MUFG Bank. With the closing of Step 3, MUFG Bank’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 and Step 2. Notes: (1) Calculated based on the exchange rate of IDR1 = ¥0.0084 (2) Calculated based on the exchange rate of IDR1 = ¥0.0077

Investment Securities _Text Blo

Investment Securities [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2018: Amortized cost Gross unrealized gains Gross unrealized losses Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 24,272,345 ¥ 299,402 ¥ 3,843 ¥ 24,567,904 Japanese prefectural and municipal bonds 1,532,143 7,808 2,520 1,537,431 Foreign governments and official institutions bonds 2,207,662 8,938 44,908 2,171,692 Corporate bonds 1,104,799 15,589 1,028 1,119,360 Residential mortgage-backed securities 1,632,346 752 15,563 1,617,535 Commercial mortgage-backed securities 95,383 473 620 95,236 Asset-backed securities 1,546,989 12,775 1,415 1,558,349 Other debt securities (1) 165,002 3,635 3,030 165,607 Total ¥ 32,556,669 ¥ 349,372 ¥ 72,927 ¥ 32,833,114 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,807 ¥ 40,212 ¥ — ¥ 1,141,019 Foreign governments and official institutions bonds 59,330 383 103 59,610 Residential mortgage-backed securities 885,965 1,660 14,726 (2) 872,899 Commercial mortgage-backed securities 171,647 4,107 1,018 (2) 174,736 Asset-backed securities 1,365,192 8,438 1,222 1,372,408 Total ¥ 3,582,941 ¥ 54,800 ¥ 17,069 ¥ 3,620,672 Equity securities: Marketable equity securities ¥ 2,789,392 ¥ 3,925,680 ¥ 43,488 ¥ 6,671,584 Total ¥ 2,789,392 ¥ 3,925,680 ¥ 43,488 ¥ 6,671,584 Notes: (1) Other debt securities in the table above include ¥152,374 million of private placement debt conduit bonds. (2) MUFG Americas Holdings Corporation (“MUFG Americas Holdings” or “MUAH”) reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity At September 30, 2018: Amortized cost Gross gains Gross unrealized losses Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 22,605,246 ¥ 241,338 ¥ 14,695 ¥ 22,831,889 Japanese prefectural and municipal bonds 1,777,026 5,325 6,084 1,776,267 Foreign governments and official institutions bonds 2,248,125 7,063 57,733 2,197,455 Corporate bonds 1,097,050 14,159 1,071 1,110,138 Residential mortgage-backed securities 1,521,850 496 26,597 1,495,749 Commercial mortgage-backed securities 109,708 48 3,136 106,620 Asset-backed securities 1,486,367 10,317 351 1,496,333 Other debt securities (1) 148,974 3,033 3,948 148,059 Total ¥ 30,994,346 ¥ 281,779 ¥ 113,615 ¥ 31,162,510 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,765 ¥ 33,485 ¥ — ¥ 1,134,250 Foreign governments and official institutions bonds 58,209 246 336 58,119 Residential mortgage-backed securities 991,682 701 29,568 (2) 962,815 Commercial mortgage-backed securities 165,786 1,321 2,001 (2) 165,106 Asset-backed securities 1,871,524 9,634 2,956 1,878,202 Total ¥ 4,187,966 ¥ 45,387 ¥ 34,861 ¥ 4,198,492 Notes: (1) Other debt securities in the table above include ¥135,688 million of private placement debt conduit bonds. (2) MUFG Americas Holdings reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity Contractual Maturities The amortized cost and fair values of Held-to-maturity Available-for-sale Held-to-maturity debt securities Available-for-sale Amortized Fair value Fair value (in millions) Due in one year or less ¥ 33,162 ¥ 33,051 ¥ 9,096,329 Due from one year to five years 173,953 174,740 12,133,838 Due from five years to ten years 1,561,712 1,592,472 5,787,030 Due after ten years 2,419,139 2,398,229 4,145,313 Total ¥ 4,187,966 ¥ 4,198,492 ¥ 31,162,510 Realized Gains and Losses For the six months ended September 30, 2017, gross realized gains on sales of Available-for-sale Available-for-sale For the six months ended September 30, 2018, 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, 2017, losses resulting from impairment of investment securities to reflect the decline in value considered to be other-than-temporary were ¥6,428 million, which were included in Investment securities gains—net in the accompanying condensed consolidated statements of income. The losses of ¥6,428 million for the six months ended September 30, 2017 included losses of ¥6,036 million from marketable equity securities and ¥108 million from Available-for-sale For the six months ended September 30, 2018, losses resulting from impairment of investment securities to reflect the decline in value considered to be other-than-temporary were ¥85 million, which were included in Investment securities gains—net in the accompanying condensed consolidated statements of income. The losses of ¥85 million for the six months ended September 30, 2018 was recorded substantially 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, 2018: Fair value Gross Fair value Gross Fair value Gross Number of (in millions, except number of securities) Available-for-sale Japanese national government and Japanese government ¥ 4,767,893 ¥ 2,701 ¥ 187,000 ¥ 1,142 ¥ 4,954,893 ¥ 3,843 140 Japanese prefectural and municipal bonds 400,705 453 353,047 2,067 753,752 2,520 193 Foreign governments and official institutions bonds 846,818 16,955 818,937 27,953 1,665,755 44,908 157 Corporate bonds 312,993 856 74,717 172 387,710 1,028 150 Residential mortgage-backed securities 438,545 2,644 623,285 12,919 1,061,830 15,563 503 Commercial mortgage-backed securities 50,898 386 9,067 234 59,965 620 60 Asset-backed securities 144,073 1,403 5,345 12 149,418 1,415 29 Other debt securities 12,341 367 56,117 2,663 68,458 3,030 23 Total ¥ 6,974,266 ¥ 25,765 ¥ 2,127,515 ¥ 47,162 ¥ 9,101,781 ¥ 72,927 1,255 Held-to-maturity Foreign governments and official institutions bonds ¥ 55,837 ¥ 103 ¥ — ¥ — ¥ 55,837 ¥ 103 10 Residential mortgage-backed securities 299,286 3,487 451,968 11,239 751,254 14,726 332 Commercial mortgage-backed securities 2,150 2 169,065 1,016 171,215 1,018 32 Asset-backed securities 275,814 1,222 — — 275,814 1,222 11 Total ¥ 633,087 ¥ 4,814 ¥ 621,033 ¥ 12,255 ¥ 1,254,120 ¥ 17,069 385 Equity securities: Marketable equity securities ¥ 448,489 ¥ 43,482 ¥ 28 ¥ 6 ¥ 448,517 ¥ 43,488 116 Total ¥ 448,489 ¥ 43,482 ¥ 28 ¥ 6 ¥ 448,517 ¥ 43,488 116 Less than 12 months 12 months or more Total At September 30, 2018: Fair value Gross Fair value Gross Fair value Gross Number of (in millions, except number of securities) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 9,844,320 ¥ 12,969 ¥ 215,149 ¥ 1,726 ¥ 10,059,469 ¥ 14,695 247 Japanese prefectural and municipal bonds 965,127 2,736 401,458 3,348 1,366,585 6,084 344 Foreign governments and official institutions bonds 719,858 14,786 956,427 42,947 1,676,285 57,733 157 Corporate bonds 263,849 801 178,709 270 442,558 1,071 147 Residential mortgage-backed securities 491,920 9,216 466,314 17,381 958,234 26,597 522 Commercial mortgage-backed securities 90,747 2,542 10,959 594 101,706 3,136 106 Asset-backed securities 167,342 350 969 1 168,311 351 36 Other debt securities 35,662 1,069 42,771 2,879 78,433 3,948 25 Total ¥ 12,578,825 ¥ 44,469 ¥ 2,272,756 ¥ 69,146 ¥ 14,851,581 ¥ 113,615 1,584 Held-to-maturity Foreign governments and official institutions bonds ¥ 54,557 ¥ 336 ¥ — ¥ — ¥ 54,557 ¥ 336 10 Residential mortgage-backed securities 424,594 8,768 518,017 20,800 942,611 29,568 463 Commercial mortgage-backed securities 5,211 113 159,895 1,888 165,106 2,001 33 Asset-backed securities 586,940 2,956 — — 586,940 2,956 23 Total ¥ 1,071,302 ¥ 12,173 ¥ 677,912 ¥ 22,688 ¥ 1,749,214 ¥ 34,861 529 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 Commercial mortgage-backed securities As of September 30, 2018, 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. Corporate bonds As of September 30, 2018, 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 2017 2018 (in millions) Balance at beginning of period ¥ 4,125 ¥ 3,498 Additions: Initial credit impairments 107 34 Subsequent credit impairments 1 51 Reductions: Securities sold or matured (403 ) (233 ) Balance at end of period ¥ 3,830 ¥ 3,350 The cumulative declines in fair value of the credit impaired debt securities, which were mainly corporate bonds, held at September 30, 2017 and 2018 were ¥3,200 million and ¥1,826 million, respectively. Of which, the credit loss components recognized in earnings were ¥3,830 million and ¥3,350 million, and the remaining amounts related to all other factors recognized in Accumulated OCI before taxes were ¥630 million and ¥1,524 million at September 30, 2017 and 2018, respectively. Residential mortgage-backed securities As of September 30, 2018, unrealized losses on these securities were primarily driven by securities guaranteed by a U.S. government agency or a government-sponsored agency which are collateralized by residential mortgage loans. Unrealized losses mainly resulted from changes in interest rates and not from changes in credit quality. The MUFG Group analyzed that no OTTI was identified on such securities as of September 30, 2018 and no impairment loss has been recorded because the strength of the issuers’ guarantees through direct obligations or support from the U.S. government is expected to be sufficient to recover the entire amortized cost basis of these securities. Asset-backed securities As of September 30, 2018, 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, 2018 and no impairment loss has been recorded. Other debt securities As of September 30, 2018, 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 included in 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. OTTI of marketable equity securities is eliminated according to new guidance on recognition and measurement of financial assets and financial liabilities. Equity Securities The following table presents net realized gains (losses) on sales of equity securities, and net unrealized gains (losses) on equity securities still held at September 30, 2018. Six months ended 2018 (in millions) Net gains recognized during the period (1) ¥ 411,720 Less: Net gains recognized during the period on equity securities sold during the period 12,470 Net unrealized gains recognized during the reporting period still held at the reporting date ¥ 399,250 Note: (1) Included in Investment securities gains—net. Nonmarketable Equity Securities Nonmarketable equity securities included in Equity securities were primarily carried at cost of ¥538,251 million at March 31, 2018, because their fair values were not readily determinable. The remaining balances were nonmarketable equity securities included in Equity securities held by certain subsidiaries subject to specialized industry accounting principles for investment companies and broker-dealers and carried at fair value of ¥28,359 million at March 31, 2018. See Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2018 for the valuation techniques and inputs used to estimate the fair values. With respect to cost-method investments of ¥97,586 million at March 31, 2018, 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, 2018 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 ¥440,665 million at March 31, 2018, 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 ¥437,486 million and at March 31, 2018, since it was not practical and the MUFG Group identified no impairment indicators. Based on the procedures described above, the MUFG Group recognized OTTI losses on the cost-method investments of ¥284 million for the six months ended September 30, 2017. Each impairment loss was recognized based on the specific circumstances of each individual company. No impairment loss was individually material. Measurement Alternative of Equity Securities The following table presents the carrying value of nonmarketable equity securities held at September 30, 2018, that were measured under the measurement alternative, and the related adjustments for these securities during the six months ended September 30, 2018. Six months ended 2018 (in millions) Measurement alternative balance at September 30, 2018 ¥ 541,961 Measurement alternative impairment losses (1) ¥ (479 ) Measurement alternative downward changes for observable prices (1) (2) ¥ — Measurement alternative upward changes for observable prices (1) (2) ¥ 8,492 Notes: (1) Included in Investment securities gains—net. (2) Under the measurement alternative, nonmarketable equity securities are carried at cost plus or minus changes resulting from observable prices in orderly transactions for the identical or a similar investment of the same issuer.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses [Text Block]	6 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Loans and Allowance for Credit Losses [Text Block]	4. LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans at March 31, 2018 and September 30, 2018 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, 2018 September 30, (in millions) Domestic: Manufacturing ¥ 10,876,625 ¥ 10,717,304 Construction 781,262 698,783 Real estate 11,763,769 11,746,501 Services 2,689,086 2,576,921 Wholesale and retail 7,989,080 7,837,551 Banks and other financial institutions (1) 4,818,364 4,892,078 Communication and information services 1,551,533 1,550,557 Other industries 8,939,291 8,943,344 Consumer 16,287,332 15,964,092 Total domestic 65,696,342 64,927,131 Foreign: Governments and official institutions 920,538 836,116 Banks and other financial institutions (1) 12,851,570 13,029,862 Commercial and industrial 30,591,173 31,936,891 Other 7,270,928 7,228,511 Total foreign 51,634,209 53,031,380 Unearned income, unamortized premiums—net and deferred loan fees—net (294,656 ) (295,279 ) Total (2) ¥ 117,035,895 ¥ 117,663,232 Notes: (1) Loans to so-called “non-bank Non-bank (2) The above table includes loans held for sale of ¥226,923 million at March 31, 2018 and ¥238,564 million at September 30, 2018, respectively. The MUFG Group classifies its loan portfolio into the following portfolio segments—Commercial, Residential, Card, MUFG Americas Holdings, and Bank of Ayudhya Public Company Limited (“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, 2018 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, MUFG Americas Holdings, 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, 2018 for further information. The nonaccrual loans by class at March 31, 2018 and September 30, 2018 is shown below: March 31, September 30, (in millions) Commercial Domestic ¥ 332,994 ¥ 307,725 Manufacturing 77,163 70,201 Construction 10,791 9,675 Real estate 33,317 26,098 Services 30,717 29,222 Wholesale and retail 108,175 101,210 Banks and other financial institutions 1,145 1,654 Communication and information services 13,815 13,151 Other industries 37,549 40,314 Consumer 20,322 16,200 Foreign-excluding MUAH and Krungsri 109,516 93,786 Residential 69,464 68,732 Card 61,387 61,694 MUAH 52,282 39,248 Krungsri 121,286 113,328 Total (1) ¥ 746,929 ¥ 684,513 Note: (1) The above table does not include loans held for sale of ¥61 million and ¥3,969 million at March 31, 2018 and September 30, 2018, respectively, and loans acquired with deteriorated credit quality of ¥6,659 million and ¥5,899 million, at March 31, 2018 and September 30, 2018, 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, 2018 and September 30, 2018: Recorded Loan Balance At March 31, 2018: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 626,469 ¥ 188,984 ¥ 815,453 ¥ 875,795 ¥ 331,851 Manufacturing 361,268 36,566 397,834 408,124 166,098 Construction 10,936 7,172 18,108 18,490 7,921 Real estate 43,553 23,053 66,606 71,809 10,665 Services 38,097 16,600 54,697 59,335 25,890 Wholesale and retail 128,661 49,628 178,289 189,404 94,832 Banks and other financial institutions 1,125 26 1,151 1,151 972 Communication and information services 18,782 7,852 26,634 28,082 16,041 Other industries 12,978 34,282 47,260 67,525 5,350 Consumer 11,069 13,805 24,874 31,875 4,082 Foreign-excluding MUAH and Krungsri 122,243 40,249 162,492 190,518 82,855 Loans acquired with deteriorated credit quality 7,837 — 7,837 15,470 4,324 Residential 105,089 6,261 111,350 134,777 16,928 Card 66,964 388 67,352 74,840 21,223 MUAH 48,895 33,650 82,545 94,565 7,743 Krungsri 58,529 25,565 84,094 90,957 29,402 Total (3) ¥ 1,036,026 ¥ 295,097 ¥ 1,331,123 ¥ 1,476,922 ¥ 494,326 Recorded Loan Balance At September 30, 2018: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 585,995 ¥ 191,468 ¥ 777,463 ¥ 834,391 ¥ 240,718 Manufacturing 351,225 36,331 387,556 397,682 88,726 Construction 8,117 6,563 14,680 15,238 6,355 Real estate 24,030 32,229 56,259 61,461 7,386 Services 33,550 15,285 48,835 52,350 23,329 Wholesale and retail 126,183 46,559 172,742 183,688 89,851 Banks and other financial institutions 1,771 25 1,796 1,796 1,583 Communication and information services 17,373 7,701 25,074 26,641 15,141 Other industries 13,004 35,894 48,898 67,095 5,376 Consumer 10,742 10,881 21,623 28,440 2,971 Foreign-excluding MUAH and Krungsri 124,631 23,959 148,590 169,822 69,774 Loans acquired with deteriorated credit quality 7,621 — 7,621 14,920 5,679 Residential 99,610 6,865 106,475 128,263 14,488 Card 65,783 391 66,174 73,590 21,686 MUAH 39,445 28,533 67,978 85,520 6,464 Krungsri 54,165 26,290 80,455 87,871 27,900 Total (3) ¥ 977,250 ¥ 277,506 ¥ 1,254,756 ¥ 1,394,377 ¥ 386,709 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’ original 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, 2018 and September 30, 2018 are accrual TDRs as follows: ¥536,748 million and ¥525,746 million—Commercial; ¥40,734 million and ¥36,915 million—Residential; ¥28,541 million and ¥27,377 million—Card; ¥39,333 million and ¥37,281 million—MUFG Americas Holdings; and ¥24,899 million and ¥26,453 million—Krungsri, respectively. (3) In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥61 million and ¥1,946 million at March 31, 2018 and September 30, 2018, 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, 2017 and 2018: 2017 2018 Average Recognized Average Recognized (in millions) Commercial Domestic ¥ 952,510 ¥ 4,830 ¥ 796,431 ¥ 5,846 Manufacturing 509,211 1,812 392,695 2,787 Construction 20,112 144 16,393 162 Real estate 77,940 574 61,434 544 Services 62,750 381 51,767 420 Wholesale and retail 190,328 1,109 175,516 1,385 Banks and other financial institutions 2,030 7 1,474 4 Communication and information services 24,872 192 25,854 246 Other industries 34,783 387 48,080 91 Consumer 30,484 224 23,218 207 Foreign-excluding MUAH and Krungsri 235,723 3,573 153,708 1,598 Loans acquired with deteriorated credit quality 8,817 563 7,648 194 Residential 123,441 846 108,914 856 Card 71,080 1,052 66,762 857 MUAH 64,293 898 66,505 955 Krungsri 71,176 1,788 83,239 2,640 Total ¥ 1,527,040 ¥ 13,550 ¥ 1,283,207 ¥ 12,946 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, 2017 and 2018: 2017 2018 (in millions) Accrual TDRs: Balance at beginning of period ¥ 819,819 ¥ 670,255 Additions (new accrual TDR status) (1) 65,483 40,021 Transfers to other impaired loans (including nonaccrual TDRs) (16,624 ) (9,623 ) Loans sold (16,776 ) (26 ) Principal payments and other (140,664 ) (46,855 ) Balance at end of period (1) ¥ 711,238 ¥ 653,772 Other impaired loans (including nonaccrual TDRs): Balance at beginning of period ¥ 896,031 ¥ 660,868 Additions (new other impaired loans (including nonaccrual TDRs) status) (1)(2) 145,885 97,596 Charge-off (57,238 ) (28,410 ) Transfers to accrual TDRs (20,000 ) (14,548 ) Loans sold (22,482 ) (2,496 ) Principal payments and other (137,124 ) (112,026 ) Balance at end of period (1) ¥ 805,072 ¥ 600,984 Notes: (1) 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. For the six months ended September 30, 2018, lease receivables of ¥538 million and ¥50 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 ¥3,642 million and ¥1,135 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2018. (2) Included in the additions of other impaired loans for the six months ended September 30, 2017 and 2018 are nonaccrual TDRs as follows: ¥6,489 million and ¥6,870 million—Card; ¥3,366 million and ¥9,809 million—MUFG Americas Holdings; and ¥6,108 million and ¥6,499 million—Krungsri, respectively. Troubled Debt Restructurings The following table summarizes the MUFG Group’s TDRs by class for the six months ended September 30, 2017 and 2018: 2017 2018 Troubled Debt Troubled Debt Troubled Debt Troubled Debt Pre- Post- Recorded Pre- Post- Recorded (in millions) Commercial (1)(3) Domestic ¥ 28,645 ¥ 28,603 ¥ 2,996 ¥ 20,440 ¥ 20,440 ¥ 1,643 Manufacturing 12,502 12,460 368 4,594 4,594 74 Construction 142 142 — 43 43 — Real estate 1,107 1,107 10 561 561 — Services 2,343 2,343 680 1,505 1,505 436 Wholesale and retail 9,889 9,889 1,778 12,240 12,240 615 Banks and other financial institutions 246 246 — — — — Communication and information services 1,072 1,072 135 156 156 518 Other industries 425 425 — 312 312 — Consumer 919 919 25 1,029 1,029 — Foreign-excluding MUAH and Krungsri 9,983 9,983 — 5,649 5,649 — Loans acquired with deteriorated credit quality — — — — — — Residential (1)(3) 5,459 5,459 124 4,235 4,235 83 Card (2)(3) 9,570 9,334 1,977 10,382 9,953 1,810 MUAH (2)(3) 18,878 18,878 2,331 11,621 11,621 199 Krungsri (2)(3) 9,856 9,856 1,735 11,889 11,889 3,545 Total ¥ 82,391 ¥ 82,113 ¥ 9,163 ¥ 64,216 ¥ 63,787 ¥ 7,280 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans, and do not include nonaccrual loans. (2) TDRs for the Card, MUFG Americas Holdings and Krungsri segments include accrual and nonaccrual loans. (3) For the six months ended September 30, 2017 and 2018, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUFG Americas Holdings and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment. The following table summarizes outstanding recorded investment balances of TDRs by class at March 31, 2018 and September 30, 2018: March 31, September 30, (in millions) Commercial (1) Domestic ¥ 482,566 ¥ 469,793 Manufacturing 320,702 317,379 Construction 7,362 5,008 Real estate 33,289 30,160 Services 23,987 19,619 Wholesale and retail 70,119 71,529 Banks and other financial institutions 6 142 Communication and information services 12,837 11,939 Other industries 9,712 8,594 Consumer 4,552 5,423 Foreign-excluding MUAH and Krungsri 54,182 55,953 Residential (1) 40,734 36,915 Card (2) 67,352 66,174 MUAH (2) 65,373 63,543 Krungsri (2) 54,036 56,026 Total ¥ 764,243 ¥ 748,404 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans and do not include nonaccrual loans. (2) TDRs for the Card, MUFG Americas Holdings and Krungsri segments include accrual and nonaccrual loans. Included in the outstanding recorded investment balances as of March 31, 2018 and September 30, 2018 are nonaccrual TDRs as follows: ¥38,811 million and ¥38,797 million—Card; ¥26,040 million and ¥26,262 million—MUFG Americas Holdings; and ¥24,855 million and ¥25,931 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, MUFG Americas Holdings 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 MUFG Americas Holdings 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, 2018 and September 30, 2018 are shown below: At March 31, 2018: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 49,050,274 ¥ 1,690,924 ¥ 271,456 ¥ 51,012,654 Manufacturing 10,215,497 596,662 57,730 10,869,889 Construction 727,932 43,673 9,116 780,721 Real estate 11,379,291 279,931 32,692 11,691,914 Services 2,467,540 175,733 24,081 2,667,354 Wholesale and retail 7,518,383 374,706 77,870 7,970,959 Banks and other financial institutions 4,800,281 10,923 1,145 4,812,349 Communication and information services 1,491,093 48,153 11,958 1,551,204 Other industries 8,780,517 120,466 36,951 8,937,934 Consumer 1,669,740 40,677 19,913 1,730,330 Foreign-excluding MUAH and Krungsri 36,049,123 569,137 108,276 36,726,536 Loans acquired with deteriorated credit quality 12,035 11,728 3,562 27,325 Total ¥ 85,111,432 ¥ 2,271,789 ¥ 383,294 ¥ 87,766,515 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 14,012,978 ¥ 67,258 ¥ 14,080,236 Card ¥ 528,108 ¥ 61,707 ¥ 589,815 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 4,360,445 ¥ 14,238 ¥ 4,509,044 ¥ 59,890 ¥ 116,842 ¥ 9,060,459 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 5,284,018 ¥ 198,526 ¥ 123,106 ¥ 5,605,650 At September 30, 2018: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 48,890,218 ¥ 1,341,229 ¥ 250,970 ¥ 50,482,417 Manufacturing 10,346,070 312,971 51,563 10,710,604 Construction 647,261 42,713 8,362 698,336 Real estate 11,404,353 252,057 25,158 11,681,568 Services 2,369,508 173,272 24,350 2,567,130 Wholesale and retail 7,414,787 345,008 72,928 7,832,723 Banks and other financial institutions 4,863,465 7,860 1,654 4,872,979 Communication and information services 1,494,291 44,645 11,340 1,550,276 Other industries 8,778,527 124,001 39,829 8,942,357 Consumer 1,571,956 38,702 15,786 1,626,444 Foreign-excluding MUAH and Krungsri 37,231,943 537,483 93,785 37,863,211 Loans acquired with deteriorated credit quality 11,194 12,391 3,270 26,855 Total ¥ 86,133,355 ¥ 1,891,103 ¥ 348,025 ¥ 88,372,483 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 13,794,000 ¥ 66,329 ¥ 13,860,329 Card ¥ 519,794 ¥ 61,995 ¥ 581,789 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 4,517,991 ¥ 13,596 ¥ 4,403,693 ¥ 57,260 ¥ 103,156 ¥ 9,095,696 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 5,496,214 ¥ 197,527 ¥ 115,084 ¥ 5,808,825 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 MUFG Americas Holdings do not include Federal Deposit Insurance Corporation (“FDIC”) covered loans which are not individually rated totaling ¥953 million and ¥825 million at March 31, 2018 and September 30, 2018, 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, 2018. For the Commercial, Residential and Card segments, credit quality indicators at March 31, 2018 and September 30, 2018 are based on information as of March 31, 2018 and September 30, 2018, respectively. For the MUFG Americas Holdings and Krungsri segments, credit quality indicators at March 31, 2018 and September 30, 2018 are generally based on information as of December 31, 2017 and June 30, 2018, respectively. Past Due Analysis Ages of past due loans by class at March 31, 2018 and September 30, 2018 are shown below: At March 31, 2018: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 13,290 ¥ 43,913 ¥ 57,203 ¥ 50,955,451 ¥ 51,012,654 ¥ 6,419 Manufacturing 1,495 1,300 2,795 10,867,094 10,869,889 — Construction 359 437 796 779,925 780,721 — Real estate 2,090 3,225 5,315 11,686,599 11,691,914 1,633 Services 1,025 620 1,645 2,665,709 2,667,354 26 Wholesale and retail 3,886 4,198 8,084 7,962,875 7,970,959 1,349 Banks and other financial institutions — 21 21 4,812,328 4,812,349 — Communication and information services 657 328 985 1,550,219 1,551,204 — Other industries 251 28,315 28,566 8,909,368 8,937,934 — Consumer 3,527 5,469 8,996 1,721,334 1,730,330 3,411 Foreign-excluding MUAH and Krungsri 12,512 19,655 32,167 36,694,369 36,726,536 1,083 Residential 78,073 19,399 97,472 13,974,118 14,071,590 10,806 Card 18,887 32,218 51,105 528,284 579,389 — MUAH 23,145 13,648 36,793 9,009,426 9,046,219 771 Krungsri 116,665 99,315 215,980 5,383,477 5,599,457 — Total ¥ 262,572 ¥ 228,148 ¥ 490,720 ¥ 116,545,125 ¥ 117,035,845 ¥ 19,079 At September 30, 2018: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 13,946 ¥ 46,030 ¥ 59,976 ¥ 50,422,441 ¥ 50,482,417 ¥ 5,551 Manufacturing 1,368 1,694 3,062 10,707,542 10,710,604 — Construction 589 313 902 697,434 698,336 13 Real estate 2,302 4,744 7,046 11,674,522 11,681,568 1,948 Services 707 789 1,496 2,565,634 2,567,130 — Wholesale and retail 4,181 1,960 6,141 7,826,582 7,832,723 73 Banks and other financial institutions — 24 24 4,872,955 4,872,979 — Communication and information services 1,170 181 1,351 1,548,925 1,550,276 — Other industries 229 30,648 30,877 8,911,480 8,942,357 — Consumer 3,400 5,677 9,077 1,617,367 1,626,444 3,517 Foreign-excluding MUAH and Krungsri 12,655 18,383 31,038 37,832,173 37,863,211 916 Residential 70,006 16,581 86,587 13,765,686 13,852,273 7,422 Card 17,700 32,058 49,758 528,174 577,932 — MUAH 21,226 13,764 34,990 9,048,818 9,083,808 763 Krungsri 121,122 94,001 215,123 5,587,828 5,802,951 — Total ¥ 256,655 ¥ 220,817 ¥ 477,472 ¥ 117,185,120 ¥ 117,662,592 ¥ 14,652 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 MUFG Americas Holdings do not include ¥5 million and nil of FDIC covered loans at March 31, 2018 and September 30, 2018, 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, 2017 and 2018 are shown below: 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 for (reversal of) 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 Six months ended September 30, 2018: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of period ¥ 491,098 ¥ 42,546 ¥ 32,119 ¥ 53,765 ¥ 144,596 ¥ 764,124 Provision for (reversal of) credit losses (104,297 ) (1,651 ) 12,400 1,423 21,065 (71,060 ) Charge-offs 22,432 1,648 12,401 7,909 30,213 74,603 Recoveries 6,616 416 500 1,448 10,119 19,099 Net charge-offs 15,816 1,232 11,901 6,461 20,094 55,504 Others (1) 3,368 — — (1,274 ) (5,045 ) (2,951 ) Balance at end of period ¥ 374,353 ¥ 39,663 ¥ 32,618 ¥ 47,453 ¥ 140,522 ¥ 634,609 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, 2018 and September 30, 2018 are shown below: At March 31, 2018: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 414,706 ¥ 16,644 ¥ 21,223 ¥ 7,743 ¥ 29,402 ¥ 489,718 Collectively evaluated for impairment 64,375 24,718 10,884 45,571 115,161 260,709 Loans acquired with deteriorated credit quality 12,017 1,184 12 451 33 13,697 Total ¥ 491,098 ¥ 42,546 ¥ 32,119 ¥ 53,765 ¥ 144,596 ¥ 764,124 Loans: Individually evaluated for impairment ¥ 977,945 ¥ 110,197 ¥ 66,957 ¥ 82,545 ¥ 84,094 ¥ 1,321,738 Collectively evaluated for impairment 86,761,245 13,961,393 512,432 8,963,679 5,515,363 115,714,112 Loans acquired with deteriorated credit quality 27,325 8,646 10,426 15,188 6,193 67,778 Total (1) ¥ 87,766,515 ¥ 14,080,236 ¥ 589,815 ¥ 9,061,412 ¥ 5,605,650 ¥ 117,103,628 At September 30, 2018: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 310,492 ¥ 14,275 ¥ 21,686 ¥ 6,464 ¥ 27,900 ¥ 380,817 Collectively evaluated for impairment 50,080 24,042 10,921 40,655 112,592 238,290 Loans acquired with deteriorated credit quality 13,781 1,346 11 334 30 15,502 Total ¥ 374,353 ¥ 39,663 ¥ 32,618 ¥ 47,453 ¥ 140,522 ¥ 634,609 Loans: Individually evaluated for impairment ¥ 926,053 ¥ 105,647 ¥ 65,805 ¥ 67,978 ¥ 80,455 ¥ 1,245,938 Collectively evaluated for impairment 87,419,575 13,746,626 512,127 9,015,830 5,722,496 116,416,654 Loans acquired with deteriorated credit quality 26,855 8,056 3,857 12,713 5,874 57,355 Total (1) ¥ 88,372,483 ¥ 13,860,329 ¥ 581,789 ¥ 9,096,521 ¥ 5,808,825 ¥ 117,719,947 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. The MUFG Group sold ¥580 billion and ¥590 billion of loans within the Commercial segment during the six months ended September 30, 2017 and 2018, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2017 and 2018: Six months ended 2017 2018 (in millions) Balance at beginning of period Goodwill ¥ 2,542,280 ¥ 2,533,471 Accumulated impairment losses (2,092,137 ) (2,092,137 ) 450,143 441,334 Foreign currency translation adjustments and other (14,590 ) (10,179 ) Balance at end of period Goodwill 2,527,690 2,523,292 Accumulated impairment losses (2,092,137 ) (2,092,137 ) ¥ 435,553 ¥ 431,155 Other Intangible Assets The table below presents the net carrying amount by major class of other intangible assets at March 31, 2018 and September 30, 2018: March 31, September 30, (in millions) Intangible assets subject to amortization: Software ¥ 732,828 ¥ 755,547 Core deposit intangibles 45,297 40,543 Customer relationships 164,753 150,612 Trade names 47,020 44,494 Other 5,729 5,459 Total 995,627 996,655 Intangible assets not subject to amortization: Other (1) 15,492 25,198 Total ¥ 1,011,119 ¥ 1,021,853 Note: (1 ) Intangible assets not subject to amortization includes mortgage servicing rights accounted for at fair value of ¥7,268 million and ¥16,346 million at March 31, 2018 and September 30, 2018, respectively. The impairment losses on other intangible assets for the six months ended September 30, 2017 and 2018 were ¥16,591 million and ¥667 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, 2018
Text Block [Abstract]
Pledged Assets and Collateral [Text Block]	6. PLEDGED ASSETS AND COLLATERAL At September 30, 2018, assets mortgaged, pledged, or otherwise subject to lien were as follows: September 30, (in millions) Trading account securities ¥ 7,703,892 Investment securities 9,178,501 Loans 13,956,677 Other 50,714 Total ¥ 30,889,784 The above pledged assets were classified by type of liabilities to which they related as follows: September 30, (in millions) Deposits ¥ 268,091 Call money and funds purchased 16,351 Payables under repurchase agreements and securities lending transactions 16,269,396 Other short-term borrowings and long-term debt 14,319,750 Other 16,196 Total ¥ 30,889,784 At September 30, 2018, certain investment securities, principally Japanese national government and Japanese government agency bonds, loans and other assets with a combined carrying value of ¥19,516,177 million were pledged 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, 2018 and September 30, 2018, the cash collateral pledged for derivative transactions, which is included in Other assets, was ¥1,473,109 million and ¥1,765,418 million, respectively, and the cash collateral received for derivative transactions, which is included in Other liabilities, was ¥1,158,053 million and ¥860,072 million, respectively.

Severance Indemnities and Pensi

Severance Indemnities and Pension Plans [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2017 and 2018: Six months ended September 30, Domestic subsidiaries Foreign offices and subsidiaries 2017 2018 2017 2018 Pension Pension Pension Other Pension Other (in millions) Service cost—benefits earned during the period ¥ 23,539 ¥ 24,205 ¥ 5,646 ¥ 348 ¥ 5,975 ¥ 271 Interest cost on projected benefit obligation 7,266 6,764 7,651 540 7,407 515 Expected return on plan assets (34,144 ) (37,170 ) (16,069 ) (1,062 ) (16,413 ) (1,139 ) Amortization of net actuarial loss 3,946 612 5,740 563 3,492 349 Amortization of prior service cost (580 ) (604 ) (1,547 ) (1,391 ) (1,496 ) (995 ) Gain on settlements and curtailment (2,019 ) (3,901 ) — — — — Net periodic benefit cost (income) ¥ (1,992 ) ¥ (10,094 ) ¥ 1,421 ¥ (1,002 ) ¥ (1,035 ) ¥ (999 ) As a result of adopting the new guidance issued in March 2017, as described in Note 1, the service cost component continues to be presented in Salaries and employee benefits while other components of net pension benefit/cost (i.e., Interest cost on projected benefit obligation, Expected return on plan assets, Amortization of net actuarial loss, Amortization of prior service cost, and Gain on settlements and curtailment disclosed in the above table) are now presented in Other non-interest The MUFG Group has contributed to the plan assets for the six months ended September 30, 2018 and expects to contribute for the remainder of the fiscal year ending March 31, 2019 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, 2018 ¥ 36.4 ¥ 1.2 ¥ 0.2 For the remainder of the fiscal year ending March 31, 2019 ¥ 8.1 ¥ 0.4 ¥ 0.2

Offsetting of Derivatives, Repu

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2018 and September 30, 2018, 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, 2018 Gross amounts of Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 12,585 ¥ — ¥ 12,585 ¥ (9,664 ) ¥ (832 ) ¥ 2,089 Receivables under resale agreements 8,825 (3,099 ) 5,726 (5,171 ) (17 ) 538 Receivables under securities borrowing transactions 9,305 (36 ) 9,269 (9,208 ) (1 ) 60 Total ¥ 30,715 ¥ (3,135 ) ¥ 27,580 ¥ (24,043 ) ¥ (850 ) ¥ 2,687 Financial liabilities: Derivative liabilities ¥ 11,877 ¥ — ¥ 11,877 ¥ (9,631 ) ¥ (1,126 ) ¥ 1,120 Payables under repurchase agreements 21,169 (3,034 ) 18,135 (17,890 ) (31 ) 214 Payables under securities lending transactions 8,206 (36 ) 8,170 (8,139 ) (12 ) 19 Obligations to return securities received as collateral 3,177 — 3,177 (1,072 ) — 2,105 Total ¥ 44,429 ¥ (3,070 ) ¥ 41,359 ¥ (36,732 ) ¥ (1,169 ) ¥ 3,458 At September 30, 2018 Gross amounts of Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 11,661 ¥ — ¥ 11,661 ¥ (9,056 ) ¥ (567 ) ¥ 2,038 Receivables under resale agreements 13,720 (2,454 ) 11,266 (10,319 ) (19 ) 928 Receivables under securities borrowing transactions 3,137 (24 ) 3,113 (3,050 ) — 63 Total ¥ 28,518 ¥ (2,478 ) ¥ 26,040 ¥ (22,425 ) ¥ (586 ) ¥ 3,029 Financial liabilities: Derivative liabilities ¥ 11,665 ¥ — ¥ 11,665 ¥ (8,798 ) ¥ (1,407 ) ¥ 1,460 Payables under repurchase agreements 28,029 (2,425 ) 25,604 (25,077 ) (42 ) 485 Payables under securities lending transactions 1,924 (24 ) 1,900 (1,849 ) (7 ) 44 Obligations to return securities received as collateral 3,427 — 3,427 (1,290 ) — 2,137 Total ¥ 45,045 ¥ (2,449 ) ¥ 42,596 ¥ (37,014 ) ¥ (1,456 ) ¥ 4,126

Repurchase Agreements, and Secu

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2018 and September 30, 2018. 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, 2018 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 2,290 ¥ 14,328 ¥ 2,004 ¥ 2,547 ¥ 21,169 Payables under securities lending transactions 4,647 2,343 1,216 — 8,206 Obligations to return securities received as collateral 2,855 202 120 — 3,177 Total ¥ 9,792 ¥ 16,873 ¥ 3,340 ¥ 2,547 ¥ 32,552 September 30, 2018 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 4,960 ¥ 16,192 ¥ 3,603 ¥ 3,274 ¥ 28,029 Payables under securities lending transactions 1,472 436 16 — 1,924 Obligations to return securities received as collateral 3,075 245 105 2 3,427 Total ¥ 9,507 ¥ 16,873 ¥ 3,724 ¥ 3,276 ¥ 33,380 Secured borrowing by the class of collateral pledged at March 31, 2018 and September 30, 2018 was as follows: March 31, 2018 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 2,462 ¥ 7,085 ¥ 1,242 ¥ 10,789 Foreign governments and official institutions bonds 14,316 36 1,344 15,696 Corporate bonds 570 — 84 654 Residential mortgage-backed securities 3,567 — — 3,567 Other debt securities 121 — — 121 Marketable equity securities 123 1,085 507 1,715 Others 10 — — 10 Total ¥ 21,169 ¥ 8,206 ¥ 3,177 ¥ 32,552 September 30, 2018 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 9,822 ¥ 691 ¥ 1,390 ¥ 11,903 Foreign governments and official institutions bonds 12,577 24 1,256 13,857 Corporate bonds 771 — 129 900 Residential mortgage-backed securities 4,517 — — 4,517 Other debt securities 85 — — 85 Marketable equity securities 103 1,208 648 1,959 Others 154 1 4 159 Total ¥ 28,029 ¥ 1,924 ¥ 3,427 ¥ 33,380

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2017 and 2018: Six months ended 2017 2018 (in millions) Accumulated other comprehensive income (loss), net of taxes: Net unrealized gains (losses) on investment securities: (1) Balance at beginning of period ¥ 2,032,807 ¥ 2,270,346 Net change during the period 253,088 (91,819 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (Note 1) — (2,700,331 ) Balance at end of period ¥ 2,285,895 ¥ (521,804 ) Net debt valuation adjustments: Balance at beginning of period ¥ (10,632 ) ¥ (16,488 ) Net change during the period (5,779 ) (2,226 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (Note 1) — (1,911 ) Balance at end of period ¥ (16,411 ) ¥ (20,625 ) Net unrealized losses on derivatives qualifying for cash flow hedges: Balance at beginning of period ¥ (8,729 ) ¥ (19,250 ) Net change during the period (626 ) (6,843 ) Balance at end of period ¥ (9,355 ) ¥ (26,093 ) Defined benefit plans: Balance at beginning of period ¥ (214,062 ) ¥ (119,593 ) Net change during the period 24,604 16,459 Balance at end of period ¥ (189,458 ) ¥ (103,134 ) Foreign currency translation adjustments: Balance at beginning of period ¥ 482,039 ¥ 362,300 Net change during the period (37,968 ) 37,116 Balance at end of period ¥ 444,071 ¥ 399,416 Balance at end of period ¥ 2,514,742 ¥ (272,240 ) Note: (1) Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018. 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, 2017 and 2018: Six months ended September 30, 2017 2018 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 (1) ¥ 540,758 ¥ (169,917 ) ¥ 370,841 ¥ (94,429 ) ¥ 29,952 ¥ (64,477 ) Reclassification adjustment for gains included in net income before attribution of noncontrolling interests (175,398 ) 52,011 (123,387 ) (14,494 ) 4,626 (9,868 ) Net change 365,360 (117,906 ) 247,454 (108,923 ) 34,578 (74,345 ) Net unrealized gains (losses) on investment securities attributable to noncontrolling interests (5,634 ) 17,474 Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group 253,088 (91,819 ) Net debt valuation adjustments: Net debt valuation adjustments (8,218 ) 2,516 (5,702 ) (4,038 ) 1,236 (2,802 ) Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests (111 ) 34 (77 ) 829 (253 ) 576 Net change (8,329 ) 2,550 (5,779 ) (3,209 ) 983 (2,226 ) Net debt valuation adjustments attributable to noncontrolling interests — — Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group (5,779 ) (2,226 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Net unrealized gains (losses) on derivatives qualifying for cash flow hedges 4,450 (1,641 ) 2,809 (10,138 ) 2,774 (7,364 ) Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests (5,584 ) 2,149 (3,435 ) 735 (214 ) 521 Net change (1,134 ) 508 (626 ) (9,403 ) 2,560 (6,843 ) Net unrealized gains on derivatives qualifying for cash flow hedges attributable to noncontrolling interests — — Net unrealized losses on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group (626 ) (6,843 ) Defined benefit plans: Defined benefit plans 31,778 (10,240 ) 21,538 26,282 (8,022 ) 18,260 Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests 4,659 (1,588 ) 3,071 (2,643 ) 878 (1,765 ) Net change 36,437 (11,828 ) 24,609 23,639 (7,144 ) 16,495 Defined benefit plans attributable to noncontrolling interests 5 36 Defined benefit plans attributable to Mitsubishi UFJ Financial Group 24,604 16,459 Foreign currency translation adjustments: Foreign currency translation adjustments (35,954 ) (2,932 ) (38,886 ) 63,376 (35,893 ) 27,483 Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests 2,961 — 2,961 (2,685 ) 851 (1,834 ) Net change (32,993 ) (2,932 ) (35,925 ) 60,691 (35,042 ) 25,649 Foreign currency translation adjustments attributable to noncontrolling interests 2,043 (11,467 ) Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group (37,968 ) 37,116 Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group ¥ 233,319 ¥ (47,313 ) Note: (1) Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018. 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, 2017 and 2018: Six months ended 2017 2018 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 (1) ¥ (181,530 ) ¥ (14,476 ) Investment securities gains—net Other 6,132 (18 ) (175,398 ) (14,494 ) Total before tax 52,011 4,626 Income tax expense ¥ (123,387 ) ¥ (9,868 ) Net of tax Net debt valuation adjustments ¥ (111 ) ¥ 829 Equity in earnings of equity method investees—net (111 ) 829 Total before tax 34 (253 ) Income tax expense ¥ (77 ) ¥ 576 Net of tax Net unrealized losses (gains) on derivatives qualifying for cash flow hedges Interest rate contracts ¥ (5,471 ) ¥ 816 Interest income on Loans, including fees Other (113 ) (81 ) (5,584 ) 735 Total before tax 2,149 (214 ) Income tax expense ¥ (3,435 ) ¥ 521 Net of tax Defined benefit plans Net actuarial loss (2) ¥ 10,249 ¥ 4,452 Other non-interest Prior service cost (2) (3,518 ) (3,095 ) Other non-interest Loss (gain) on settlements and curtailment, and other ( 2 ) (2,072 ) (4,000 ) Other non-interest 4,659 (2,643 ) Total before tax (1,588 ) 878 Income tax expense ¥ 3,071 ¥ (1,765 ) Net of tax Foreign currency translation adjustments ¥ — ¥ (2,686 ) Other non-interest 2,961 1 Other non-interest 2,961 (2,685 ) Total before tax — 851 Income tax expense ¥ 2,961 ¥ (1,834 ) Net of tax Total reclassifications for the period ¥ (173,473 ) ¥ (18,258 ) Total before tax 52,606 5,888 Income tax expense ¥ (120,867 ) ¥ (12,370 ) Net of tax Notes: (1 ) Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018, while included unrealized gains (losses) related to both debt and equity securities in six months ended on September 30, 2017. (2 ) These Accumulated OCI components are components of net periodic benefit cost. See Note 7 for more information.

Noncontrolling Interests _Text

Noncontrolling Interests [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2017 and 2018: Six months ended 2017 2018 (in millions) Net income attributable to Mitsubishi UFJ Financial Group ¥ 790,704 ¥ 553,251 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 36 Net transfers from (to) the noncontrolling interest shareholders (34,697 ) 36 Change from net income attributable to Mitsubishi UFJ Financial Group and transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders ¥ 756,007 ¥ 553,287

Derivative Financial Instrument

Derivative Financial Instruments [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2018 for a further discussion of the MUFG Group’s use of derivative instruments. During the six months ended September 30, 2018, 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 MUFG Americas Holdings whose fiscal period ends on December 31. Cash Flow Hedges MUFG Americas Holdings uses interest rate swaps to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans, and to a lesser extent, to hedge interest rate risk on rollover debt. MUFG Americas Holdings used interest rate swaps with an aggregate notional amount of ¥20.0 billion at June 30, 2018 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed short-term borrowings. At June 30, 2018, the weighted average remaining life of the active cash flow hedges was 2.1 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 MUFG Americas Holdings 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, 2018 and September 30, 2018: Notional amounts (1) March 31, September 30, (in trillions) Interest rate contracts ¥ 1,219.7 ¥ 1,359.2 Foreign exchange contracts 220.8 223.9 Equity contracts 6.1 6.9 Commodity contracts 0.3 0.2 Credit derivatives 6.5 6.7 Others 3.1 2.9 Total ¥ 1,456.5 ¥ 1,599.8 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, 2018 and September 30, 2018: Fair value of derivative instruments March 31, 2018 (1)(5) September 30, 2018 (1)(5) Not designated (2) Designated (3) Total (4) Not designated (2) Designated (3) Total (4) (in billions) Derivative assets: Interest rate contracts ¥ 8,712 ¥ — ¥ 8,712 ¥ 7,808 ¥ — ¥ 7,808 Foreign exchange contracts 3,557 — 3,557 3,538 — 3,538 Equity contracts 207 — 207 219 — 219 Commodity contracts 35 — 35 31 — 31 Credit derivatives 72 — 72 63 — 63 Others 2 — 2 2 — 2 Total derivative assets ¥ 12,585 ¥ — ¥ 12,585 ¥ 11,661 ¥ — ¥ 11,661 Derivative liabilities: Interest rate contracts ¥ 8,674 ¥ 17 ¥ 8,691 ¥ 7,916 ¥ — ¥ 7,916 Foreign exchange contracts 3,000 — 3,000 3,496 — 3,496 Equity contracts 227 — 227 268 — 268 Commodity contracts 33 — 33 30 — 30 Credit derivatives 71 — 71 72 — 72 Others (6) (145 ) — (145 ) (117 ) — (117 ) Total derivative liabilities ¥ 11,860 ¥ 17 ¥ 11,877 ¥ 11,665 ¥ — ¥ 11,665 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 MUFG Americas Holdings. 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, 2018. (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, 2017 and 2018: 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, 2017: Interest rate contracts ¥ — ¥ (8 ) ¥ (8 ) Foreign exchange contracts (158 ) — (158 ) Equity contracts — (146 ) (146 ) Credit derivatives — (1 ) (1 ) Others (1 ) (38 ) (39 ) Total ¥ (159 ) ¥ (193 ) ¥ (352 ) Six months ended September 30, 2018: Interest rate contracts ¥ — ¥ (53 ) ¥ (53 ) Foreign exchange contracts (287 ) — (287 ) Equity contracts — (115 ) (115 ) Credit derivatives — (5 ) (5 ) Others (5 ) (55 ) (60 ) Total ¥ (292 ) ¥ (228 ) ¥ (520 ) Gains and losses for derivatives designated as cash flow hedges Six months ended September 30, 2017 2018 (in billions) Gains (losses) recognized in Accumulated OCI on derivative instruments (Effective portion) Interest rate contracts ¥ 4 ¥ (11 ) Total ¥ 4 ¥ (11 ) Gains (losses) reclassified from Accumulated OCI into income (Effective portion) Interest rate contracts (1) ¥ 6 ¥ (1 ) Total ¥ 6 ¥ (1 ) 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, 2018 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, 2018 and September 30, 2018: Protection sold Maximum potential/Notional amount Fair value At March 31, 2018: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 440,610 ¥ 1,199,269 ¥ 85,094 ¥ 1,724,973 ¥ (33,389 ) Non-investment 168,102 259,497 4,775 432,374 (3,431 ) Not rated — 45,425 — 45,425 8 Total 608,712 1,504,191 89,869 2,202,772 (36,812 ) Index and basket credit default swaps held by BK: Investment grade (2) 3,000 118,359 37,781 159,140 (3,381 ) Non-investment 7,000 82,867 — 89,867 (1,311 ) Total 10,000 201,226 37,781 249,007 (4,692 ) Index and basket credit default swaps held by SCHD: Investment grade (2) 15,000 108,000 6,000 129,000 (2,641 ) Non-investment 12,000 29,000 — 41,000 (749 ) Not rated 42,439 260,951 1,863 305,253 (16,294 ) Total 69,439 397,951 7,863 475,253 (19,684 ) Total index and basket credit default swaps sold 79,439 599,177 45,644 724,260 (24,376 ) Total credit default swaps sold 688,151 2,103,368 135,513 2,927,032 (61,188 ) Other credit derivatives sold (3) Investment grade — 74,368 — 74,368 (24 ) Total credit derivatives ¥ 688,151 ¥ 2,177,736 ¥ 135,513 ¥ 3,001,400 ¥ (61,212 ) Protection sold Maximum potential/Notional amount by Fair value At September 30, 2018: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 365,541 ¥ 1,392,067 ¥ 119,690 ¥ 1,877,298 ¥ (31,119 ) Non-investment 135,585 275,649 5,754 416,988 (1,295 ) Not rated — 4,090 — 4,090 (19 ) Total 501,126 1,671,806 125,444 2,298,376 (32,433 ) Index and basket credit default swaps held by BK: Investment grade (2) 7,000 150,293 — 157,293 (2,966 ) Non-investment — 103,349 — 103,349 (1,602 ) Total 7,000 253,642 — 260,642 (4,568 ) Index and basket credit default swaps held by SCHD: Investment grade (2) 28,030 177,690 8,869 214,589 (4,136 ) Not rated 13,422 208,872 1,764 224,058 (5,861 ) Total 41,452 386,562 10,633 438,647 (9,997 ) Total index and basket credit default swaps sold 48,452 640,204 10,633 699,289 (14,565 ) Total credit default swaps sold 549,578 2,312,010 136,077 2,997,665 (46,998 ) Other credit derivatives sold (3) Investment grade — 79,499 — 79,499 5,315 Total credit derivatives ¥ 549,578 ¥ 2,391,509 ¥ 136,077 ¥ 3,077,164 ¥ (41,683 ) 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 ¥52 billion and ¥2,416 billion, respectively, at March 31, 2018, and approximately ¥38 billion and ¥2,438 billion, respectively, at September 30, 2018. 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 derivative instruments held by the MUFG Group 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, 2018 and September 30, 2018 was approximately ¥0.7 trillion and ¥0.6 trillion, respectively, for which the MUFG Group has posted collateral of approximately ¥127 billion and ¥83 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 ¥78 billion and ¥65 billion, respectively, as of March 31, 2018 and ¥79 billion and ¥93 billion, respectively, as of September 30, 2018.

Obligations under Guarantees an

Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block]	6 Months Ended
	Sep. 30, 2018
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, 2018. The table below presents the contractual or notional amounts of such guarantees at March 31, 2018 and September 30, 2018: March 31, September 30, (in billions) Standby letters of credit and financial guarantees ¥ 4,311 ¥ 4,067 Performance guarantees 3,051 3,243 Derivative instruments (1)(2) 40,513 52,204 Liabilities of trust accounts 9,444 9,282 Others 22 25 Total ¥ 57,341 ¥ 68,821 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, 2018 and September 30, 2018. 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, 2018: Maximum Amount by borrower grade Normal Close (1) Likely to (1) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 4,311 ¥ 4,211 ¥ 83 ¥ 13 ¥ 4 Performance guarantees 3,051 2,910 113 5 23 Total ¥ 7,362 ¥ 7,121 ¥ 196 ¥ 18 ¥ 27 At September 30, 2018: Maximum Amount by borrower grade Normal Close (1) Likely to (1) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 4,067 ¥ 3,973 ¥ 72 ¥ 18 ¥ 4 Performance guarantees 3,243 3,166 45 8 24 Total ¥ 7,310 ¥ 7,139 ¥ 117 ¥ 26 ¥ 28 Note: (1 ) See Notes of the tables regarding “the maximum potential amount of future payments classified based upon internal credit ratings “in Note 25 to the consolidated financial statements for the fiscal year ended March 31, 2018. 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, 2018. 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 ¥ 80,090 ¥ 79,308 Commercial letters of credit 1,191 1,123 Commitments to make investments 183 236 Other 13 6

Contingent Liabilities _Text Bl

Contingent Liabilities [Text Block]	6 Months Ended
	Sep. 30, 2018
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 ¥23,724 million and ¥17,686 million as of March 31, 2018 and September 30, 2018, respectively. Provision (reversal) related to the allowance for the six months ended September 30, 2017 and 2018 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, 2018
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, 2018 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, 2018 and September 30, 2018: Consolidated VIEs Consolidated assets At March 31, 2018: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 7,390,029 ¥ 52,703 ¥ 44,902 ¥ 2,273 ¥ 1,777,017 ¥ 5,502,892 ¥ 10,242 Investment funds 598,662 — 10,300 461,036 19,895 — 107,431 Special purpose entities created for structured financing 198,484 — 2,332 — — 149,194 46,958 Repackaged instruments 152,781 520 — 17,376 92,210 42,632 43 Securitization of the MUFG Group’s assets 10,852,539 — — — — 10,827,488 25,051 Trust arrangements 7,177,407 — 10,541 702 152,277 7,011,255 2,632 Others 44,247 361 14,236 — 42 12,963 16,645 Total consolidated assets before elimination 26,414,149 53,584 82,311 481,387 2,041,441 23,546,424 209,002 The amounts eliminated in consolidation (7,223,156 ) (53,454 ) (59,150 ) (3,804 ) (88,758 ) (6,996,317 ) (21,673 ) Total consolidated assets ¥ 19,190,993 ¥ 130 ¥ 23,161 ¥ 477,583 ¥ 1,952,683 ¥ 16,550,107 ¥ 187,329 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 7,409,190 ¥ — ¥ 5,176,663 ¥ 1,708,354 ¥ 524,173 Investment funds 11,735 — — — 11,735 Special purpose entities created for structured financing 115,353 — 587 112,054 2,712 Repackaged instruments 148,928 — 12,676 132,012 4,240 Securitization of the MUFG Group’s assets 10,816,672 — 5,000 10,806,145 5,527 Trust arrangements 7,171,852 7,103,738 655 — 67,459 Others 43,030 — 24,747 1,603 16,680 Total consolidated liabilities before elimination 25,716,760 7,103,738 5,220,328 12,760,168 632,526 The amounts eliminated in consolidation (15,347,991 ) — (3,028,987 ) (12,248,680 ) (70,324 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,745,330 ) (7,103,738 ) (2,162,890 ) (540 ) (478,162 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 623,439 ¥ — ¥ 28,451 ¥ 510,948 ¥ 84,040 Consolidated VIEs Consolidated assets At September 30, 2018: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 6,964,990 ¥ 44,532 ¥ 22,700 ¥ 4,708 ¥ 1,624,529 ¥ 5,245,861 ¥ 22,660 Investment funds 579,356 72 6,681 423,465 18,566 — 130,572 Special purpose entities created for structured financing 211,059 — 1,760 — — 143,800 65,499 Repackaged instruments 276,805 349 — 25,528 163,082 87,106 740 Securitization of the MUFG Group’s assets 10,650,823 — — — — 10,625,617 25,206 Trust arrangements 7,325,138 — 11,225 131 233,928 7,077,817 2,037 Others 35,414 364 1,313 — 40 11,139 22,558 Total consolidated assets before elimination 26,043,585 45,317 43,679 453,832 2,040,145 23,191,340 269,272 The amounts eliminated in consolidation (7,264,990 ) (41,951 ) (25,078 ) (7,351 ) (75,838 ) (7,063,476 ) (51,296 ) Total consolidated assets ¥ 18,778,595 ¥ 3,366 ¥ 18,601 ¥ 446,481 ¥ 1,964,307 ¥ 16,127,864 ¥ 217,976 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 6,977,482 ¥ — ¥ 4,830,851 ¥ 1,639,594 ¥ 507,037 Investment funds 42,479 — — 5,152 37,327 Special purpose entities created for structured financing 128,028 — 372 125,221 2,435 Repackaged instruments 276,100 — 45,699 173,690 56,711 Securitization of the MUFG Group’s assets 10,612,411 — — 10,606,699 5,712 Trust arrangements 7,319,352 7,140,178 — — 179,174 Others 34,070 — 9,997 1,530 22,543 Total consolidated liabilities before elimination 25,389,922 7,140,178 4,886,919 12,551,886 810,939 The amounts eliminated in consolidation (14,996,741 ) (24,079 ) (2,825,212 ) (12,026,663 ) (120,787 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,753,211 ) (7,116,099 ) (2,045,306 ) (745 ) (591,061 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 639,970 ¥ — ¥ 16,401 ¥ 524,478 ¥ 99,091 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, 2018: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 29,011,749 ¥ 5,721,627 ¥ 4,645,697 ¥ 620 ¥ 1,541,591 ¥ 3,103,486 ¥ — ¥ — ¥ — Investment funds 45,090,381 1,776,366 1,525,127 213,722 891,062 413,855 6,488 17,919 17,919 Special purpose entities created for structured financing 35,437,349 4,016,999 3,193,621 309,560 116,961 2,697,126 69,974 7,217 7,217 Repackaged instruments 10,212,933 2,576,619 2,487,377 759,591 1,421,716 236,852 69,218 — — Others 49,582,444 3,760,375 2,740,529 94,882 61,192 2,482,141 102,314 24,830 24,830 Total ¥ 169,334,856 ¥ 17,851,986 ¥ 14,592,351 ¥ 1,378,375 ¥ 4,032,522 ¥ 8,933,460 ¥ 247,994 ¥ 49,966 ¥ 49,966 Non-consolidated VIEs On-balance On-balance sheet At September 30, 2018: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 31,417,028 ¥ 6,192,648 ¥ 4,901,268 ¥ 284 ¥ 1,591,198 ¥ 3,309,786 ¥ — ¥ — ¥ — Investment funds 52,638,790 2,061,803 1,873,732 456,304 1,115,847 293,763 7,818 551 551 Special purpose entities created for structured financing 41,827,348 4,278,002 3,326,807 215,302 95,901 3,015,060 544 12,971 12,971 Repackaged instruments 11,133,879 2,973,296 2,894,459 705,482 1,896,859 225,887 66,231 — — Others 71,873,766 3,941,479 2,860,875 130,234 57,189 2,573,669 99,783 23,245 23,245 Total ¥ 208,890,811 ¥ 19,447,228 ¥ 15,857,141 ¥ 1,507,606 ¥ 4,756,994 ¥ 9,418,165 ¥ 174,376 ¥ 36,767 ¥ 36,767 Maximum exposure to loss on each type of entity is determined based on the carrying amount of any on-balance off-balance on-balance

Fees and Commissions Income _Te

Fees and Commissions Income [Text Block]	6 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Fees and Commissions Income [Text Block]	16. FEES AND COMMISSIONS INCOME Performance Obligation The MUFG Group recognizes revenue from contracts with customers in the amount of consideration it expects to receive upon the transfer of control of a good or service. The timing of recognition is dependent on whether the MUFG Group satisfies a performance obligation by transferring control of the product or service to a customer over time or at a point in time. The following is an explanation of the MUFG Group’s key revenue from contracts with customers and the timing of its recognition, including its relationship with revenue information disclosed for each reportable segment. These revenues from contracts with customers are related to various reportable segments disclosed in Note 17. The business segment information 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. Further, the format and information as disclosed in Note 17 are not consistent with the accompanying consolidated financial statements prepared on the basis of U.S. GAAP. For example, management does not use information on segments’ gross revenue to allocate resources and assess performance. Fees and commissions on deposits consist of fees and commissions charged for transaction-based services such as usage of automated teller machines and withdrawal services and for periodic account maintenance services. The MUFG Group’s performance obligation for the transaction-based services is satisfied and the fees and commissions are recognized at the point in time when the MUFG Group’s performance under the terms of a contractual arrangement is completed, which is at the settlement of a transaction, while the MUFG Group’s performance obligation for maintenance service is satisfied and the fees and commissions are recognized over the course of each month. The majority of these fees and commissions are from the business activities relevant to Retail & Commercial Banking Business Group (“R&C”), with Global Commercial Banking Group (“GCB”) providing a smaller impact. Fees and commissions on remittances and transfers consist of fees and commissions charged for settlement transactions such as domestic fund remittances, including transactions used by electronic banking, and are recognized at the point in time when the MUFG Group’s performance under the terms of a contractual arrangement is completed, which is at the settlement of a transaction. The business activities relevant to these fees and commissions are attributable to R&C, Japanese Corporate Investment Banking Group (“JCIB”), Global Corporate Investment Banking Group (“GCIB”), and GCB with no significant concentration in any particular segments. Fees and commissions on foreign trading business consist of fees and commissions charged for fund collection and trade-related financing services related to foreign trading business, and are recognized in the period in which the related service is provided. If they arise from foreign trading business activities under which the customer consumes the related services at a point in time (e.g. foreign exchange fees), such fees are recognized at the same point in time. If they arise from foreign trading business activities under which the customer consumes the related services equally over the period of service (e.g. commercial letters of credit), such fees are recognized over the same period. The business activities relevant to these fees and commissions are attributable to R&C, JCIB, GCIB, and GCB with no significant concentration in any particular segments. Fees and commissions on credit card business consist of fees and commissions related to credit card business such as interchange income, royalty and other service charges from franchisees. Interchange income from the credit card business is recognized as processed transactions are settled through the associated payment networks, while royalty and other service charges related to the credit card business are recognized on a straight-line basis over the period of service. The business activities relevant to these fees and commissions are substantially attributable to R&C. Fees and commissions on security-related services primarily consist of fees and commissions for sales and transfers of securities including investment funds, underwriting, brokerage and advisory services, arrangement fees on securitizations, and agency services for the calculation and payment of dividends. Fees and commissions on security-related services are recognized in the period in which the related service is provided. If they arise from security-related services under which the customer consumes the related services at a point in time (e.g. Sales and transfers of securities are executed at the customer’s direction; underwritings of debt and equity securities or securitizations are completed at the trade date; advice is provided to the clients; and dividends are calculated and then paid to investors), such fees are recognized at the same point in time. If they arise from security-related services under which the customer consumes the related services equally over the period of service (e.g. retainer fees on M&A advisory fees), such fees are recognized over the same period. The advisory fees which are paid upon meeting certain performance goals (e.g. success fees on M&A advisory fees) are recognized at the point in time when the performance goals are met. The majority of these fees and commissions are from the business activities relevant to R&C, with JCIB and GCIB providing a smaller impact. Fees and commissions on administration and management services for investment funds primarily consist of fees and commissions earned from administrating and managing investment funds, including assets under management on behalf of clients. Such fees and commissions are recognized equally over the period of service at the amount calculated primarily based on the outstanding amount of each entrusted asset, the percentage of fees, and the extent of the service provided to administer the investment funds. The business activities relevant to these fees and commissions are substantially attributable to Asset Management & Investor Service Business Group (“AM/IS”). Trust fees consist primarily of fees earned by fiduciary asset management and administration services for corporate pension plans and investment funds, and are recognized on an accrual basis, generally based on the volume of trust assets under management and/or the operating performance for the accounting period of each trust account. With respect to the trust accounts with a guarantee of trust principal, trust fees are determined based on the profits earned by individual trust accounts during the trust accounting period, less deductions, including provision for reserves, impairment for individual investments and dividends paid to beneficiary certificate holders. The trust fees for these trust accounts are accrued based on the amounts expected to be earned during the accounting period of each trust account. The business activities relevant to these fees and commissions are attributable to R&C, JCIB, and AM/IS with no significant concentration in any particular segments. Guarantee fees consist of fees related to the guarantee business such as providing guarantees on residential mortgage loans and other loans, and are recognized over the contractual periods of the respective guarantees. Insurance commissions consist of commissions earned from third-party insurance companies for marketing and selling insurance products and for the maintenance of insurance contracts. The former is recognized at the point in time which the associated service is fulfilled as the insurance contract is established by the insurance company, while the latter is recognized over the insurance period. The majority of these fees and commissions are from the business activities relevant to R&C, with GCB providing a smaller impact. Fees and commissions on real estate business primarily consist of fees from real estate agent services, and are recognized in the period in which the related service is provided when assisting customers in the sales or purchase of real estate property. The business activities relevant to these fees and commissions are attributable to R&C and JCIB with no significant concentration in any particular segments. Other fees and commissions include various fees and commissions earned on services to customers which have performance obligations that the MUFG Group completes in order to recognize revenue. The primary portion includes non-refundable financing related fees such as arrangement fees that are recognized when the service is provided. Disaggregation of Contract Revenue Details of fees and commissions income for the six months ended September 30, 2017 and 2018 are as follows: 2017 2018 (in millions) Fees and commissions on deposits ¥ 27,100 ¥ 26,568 Fees and commissions on remittances and transfers 82,896 84,342 Fees and commissions on foreign trading business 37,002 35,453 Fees and commissions on credit card business 102,992 110,223 Fees and commissions on security-related services 127,151 119,007 Fees and commissions on administration and management services for investment funds 80,643 74,928 Trust fees 55,086 57,459 Guarantee fees (1) 21,609 22,205 Insurance commissions 25,302 23,469 Fees and commissions on real estate business 18,140 17,878 Other fees and commissions (2) 123,995 133,906 Total ¥ 701,916 ¥ 705,438 Notes: (1 ) Guarantee fees are not within the scope of the guidance on revenue from contracts with customers (2 ) Other fees and commissions include non-refundable Contract Balances Contract balances are recognized in the consolidated balance sheets in accordance with the definition of receivables and contract liabilities specified in the guidance on revenue from contracts with customers. Receivables include receivables for which the services are completed, and accrued income which represents the amount of consideration unpaid for the performance obligations that have been fulfilled pursuant to certain contracts under which the services are continuously provided. Contract liabilities include unearned revenue which represents the amount of consideration received for the performance obligations that have not been fulfilled pursuant to certain contracts under which the services are continuously provided. As of September 30, 2018, receivables from contracts with customers of ¥194 billion were included primarily in Other assets, and contract liabilities of ¥6 billion were included in Other liabilities.

Business Segments _Text Block_

Business Segments [Text Block]	6 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Business Segments [Text Block]	17. BUSINESS SEGMENTS The reportable segments of the MUFG Group are subject to the periodical review by the Executive Committee, which represents the MUFG Group’s chief operating decision maker, to determine the allocation of management resources and assess performance. The MUFG Group has established its business units according to the characteristics of customers and the nature of the underlying business. Each business unit engages in business activities based on comprehensive strategies developed for and aimed at respective targeted customers and businesses. 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. Effective April 1, 2018, the MUFG Group reorganized its business groups in an effort to further integrate the expertise and capabilities of its consolidated subsidiaries to respond to the needs of customers more effectively and efficiently, as part of its current medium-term business plan. To make and execute unified group-wide strategies based on customer characteristics and the nature of business, the MUFG Group integrated the operations of its consolidated subsidiaries into six business segments.—Retail & Commercial Banking, Japanese Corporate & Investment Banking, Global Corporate & Investment Banking, Global Commercial Banking, Asset Management & Investor Services, and Global Markets. The following is a brief explanation of the MUFG Group’s business segments: Retail & Commercial Banking Business Group medium-sized Japanese Corporate & Investment Banking Business Group Global Corporate & Investment Banking Business Group non-Japanese Global Commercial Banking Business Group medium-sized Asset Management & Investor Services 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. Prior period business segment information has been restated to enable comparison between the relevant amounts for the six months ended September 30, 2017 and 2018. Customer Business Retail & Japanese Global Global Asset Total Global Other Total (1) (in billions) Six months ended September 30, 2017: Net revenue: ¥ 766.9 ¥ 252.2 ¥ 195.3 ¥ 314.5 ¥ 93.1 ¥ 1,622.0 ¥ 373.9 ¥ 41.3 ¥ 2,037.2 BK and TB (2) 382.9 214.1 124.7 (1.5 ) 41.7 761.9 278.4 69.3 1,109.6 Net interest income 234.0 77.8 48.6 (1.5 ) — 358.9 121.9 111.6 592.4 Net fees 133.6 109.0 78.0 — 41.7 362.3 (9.3 ) (34.9 ) 318.1 Other 15.3 27.3 (1.9 ) — — 40.7 165.8 (7.4 ) 199.1 Other than BK and TB 384.0 38.1 70.6 316.0 51.4 860.1 95.5 (28.0 ) 927.6 Operating expenses 609.5 148.8 122.6 227.4 58.7 1,167.0 113.9 79.3 1,360.2 Operating profit (loss) ¥ 157.4 ¥ 103.4 ¥ 72.7 ¥ 87.1 ¥ 34.4 ¥ 455.0 ¥ 260.0 ¥ (38.0 ) ¥ 677.0 Six months ended September 30, 2018: Net revenue: ¥ 754.5 ¥ 260.5 ¥ 200.6 ¥ 343.8 ¥ 104.4 ¥ 1,663.8 ¥ 258.3 ¥ 12.1 ¥ 1,934.2 BK and TB (2) 363.3 203.7 136.5 (0.9 ) 49.0 751.6 166.2 97.5 1,015.3 Net interest income 233.1 75.6 57.9 (0.9 ) — 365.7 103.7 189.8 659.2 Net fees 115.4 98.9 78.3 — 49.0 341.6 (9.1 ) (31.1 ) 301.4 Other 14.8 29.2 0.3 — — 44.3 71.6 (61.2 ) 54.7 Other than BK and TB 391.2 56.8 64.1 344.7 55.4 912.2 92.1 (85.4 ) 918.9 Operating expenses 608.8 144.9 123.4 239.5 60.6 1,177.2 113.1 73.4 1,363.7 Operating profit (loss) ¥ 145.7 ¥ 115.6 ¥ 77.2 ¥ 104.3 ¥ 43.8 ¥ 486.6 ¥ 145.2 ¥ (61.3 ) ¥ 570.5 Notes: (1) Prior period business segment information has been restated to reflect the transfer of corporate loan-related businesses of Mitsubishi UFJ Trust and Banking to MUFG Bank. In accordance with internal management accounting rules and practices, the transfer resulted in a decrease of the total operating profit by ¥11.8 billion for the six months ended September 30, 2017. (2) “BK and TB” is a sum of MUFG Bank on a stand-alone basis and Mitsubishi UFJ Trust and Banking 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, 2017 and 2018 above to income before income tax expense shown in the accompanying condensed consolidated statements of income is as follows: Six months ended 2017 2018 (in billions) Operating profit ¥ 677 ¥ 571 Reversal of credit losses 187 71 Foreign exchange gains (losses)—net 23 (43 ) Trading account losses—net (50 ) (330 ) Equity investment securities gains—net 95 391 Debt investment securities gains (losses)—net (5 ) 14 Equity in earnings of equity method investees—net 89 140 Provision for off-balance (1 ) (42 ) Other—net (1 ) (76 ) Income before income tax expense ¥ 1,014 ¥ 696

Fair Value _Text Block_

Fair Value [Text Block]	6 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value [Text Block]	18. 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, 2018. During the six months ended September 30, 2018, 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, 2018 and September 30, 2018: At March 31, 2018 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 10,876,424 ¥ 10,876,080 ¥ 827,493 ¥ 22,579,997 Debt securities Japanese national government and Japanese government agency bonds 1,388,143 477,530 — 1,865,673 Japanese prefectural and municipal bonds — 189,756 — 189,756 Foreign governments and official institutions bonds 8,190,781 469,342 1,047 8,661,170 Corporate bonds — 3,255,503 23,092 3,278,595 Residential mortgage-backed securities — 4,432,307 41,141 4,473,448 Asset-backed securities — 186,351 684,637 870,988 Other debt securities — 2,800 33,450 36,250 Commercial paper — 1,210,775 — 1,210,775 Equity securities (2) 1,297,500 651,716 44,126 1,993,342 Trading derivative assets 71,175 12,420,100 93,900 12,585,175 Interest rate contracts 3,320 8,681,427 27,092 8,711,839 Foreign exchange contracts 1,890 3,543,413 12,118 3,557,421 Equity contracts 65,965 118,351 22,994 207,310 Commodity contracts — 6,239 30,753 36,992 Credit derivatives — 70,670 943 71,613 Investment securities: Available-for-sale 23,105,682 9,376,772 350,660 32,833,114 Japanese national government and Japanese government agency bonds 21,522,128 3,045,776 — 24,567,904 Japanese prefectural and municipal bonds — 1,537,431 — 1,537,431 Foreign governments and official institutions bonds 1,583,554 567,946 20,192 2,171,692 Corporate bonds — 1,113,323 6,037 1,119,360 Residential mortgage-backed securities — 1,617,520 15 1,617,535 Commercial mortgage-backed securities — 92,806 2,430 95,236 Asset-backed securities — 1,397,177 161,172 1,558,349 Other debt securities — 4,793 160,814 165,607 Equity securities (6) 6,255,413 416,171 28,359 6,699,943 Marketable equity securities 6,255,413 416,171 — 6,671,584 Nonmarketable equity securities — — 28,359 28,359 Others (3)(4) 955,548 93,042 8,660 1,057,250 Total ¥ 41,264,242 ¥ 33,182,165 ¥ 1,309,072 ¥ 75,755,479 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 208,354 ¥ 7,060 ¥ — ¥ 215,414 Trading derivative liabilities 80,673 11,844,463 81,781 12,006,917 Interest rate contracts 3,085 8,659,042 12,496 8,674,623 Foreign exchange contracts 2,058 2,992,812 5,382 3,000,252 Equity contracts 75,530 117,572 33,679 226,781 Commodity contracts — 4,362 30,070 34,432 Credit derivatives — 70,675 154 70,829 Obligation to return securities received as collateral 3,030,974 145,988 — 3,176,962 Others (5) — 507,700 (25,528 ) 482,172 Total ¥ 3,320,001 ¥ 12,505,211 ¥ 56,253 ¥ 15,881,465 At September 30, 2018 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 11,165,761 ¥ 12,454,327 ¥ 776,404 ¥ 24,396,492 Debt securities Japanese national government and Japanese government agency bonds 2,395,839 428,697 — 2,824,536 Japanese prefectural and municipal bonds — 82,105 — 82,105 Foreign governments and official institutions bonds 7,096,467 472,704 1,135 7,570,306 Corporate bonds — 3,537,933 12,400 3,550,333 Residential mortgage-backed securities — 5,046,706 38,736 5,085,442 Asset-backed securities — 332,137 626,934 959,071 Other debt securities — 877 35,796 36,673 Commercial paper — 1,628,906 — 1,628,906 Equity securities (2) 1,673,455 924,262 61,403 2,659,120 Trading derivative assets 81,056 11,504,535 75,241 11,660,832 Interest rate contracts 13,761 7,776,462 16,998 7,807,221 Foreign exchange contracts 3,621 3,517,345 16,977 3,537,943 Equity contracts 63,674 143,420 12,256 219,350 Commodity contracts — 4,842 28,018 32,860 Credit derivatives — 62,466 992 63,458 Investment securities: Available-for-sale 21,343,577 9,520,671 298,262 31,162,510 Japanese national government and Japanese government agency bonds 19,682,038 3,149,851 — 22,831,889 Japanese prefectural and municipal bonds — 1,776,267 — 1,776,267 Foreign governments and official institutions bonds 1,661,539 516,971 18,945 2,197,455 Corporate bonds — 1,107,735 2,403 1,110,138 Residential mortgage-backed securities — 1,495,734 15 1,495,749 Commercial mortgage-backed securities — 104,327 2,293 106,620 Asset-backed securities — 1,365,717 130,616 1,496,333 Other debt securities — 4,069 143,990 148,059 Equity securities (6) 6,503,595 517,401 28,413 7,049,409 Marketable equity securities 6,503,595 517,401 — 7,020,996 Nonmarketable equity securities (7) — — 28,413 28,413 Others (3)(4) 923,764 49,712 18,022 991,498 Total ¥ 40,017,753 ¥ 34,046,646 ¥ 1,196,342 ¥ 75,260,741 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 28,947 ¥ 14,720 ¥ — ¥ 43,667 Trading derivative liabilities 130,816 11,589,654 61,842 11,782,312 Interest rate contracts 14,316 7,881,739 20,144 7,916,199 Foreign exchange contracts 2,060 3,489,349 4,415 3,495,824 Equity contracts 114,440 142,932 10,211 267,583 Commodity contracts — 3,858 26,947 30,805 Credit derivatives — 71,776 125 71,901 Obligation to return securities received as collateral 3,259,898 167,260 — 3,427,158 Others (5) — 486,579 5,005 491,584 Total ¥ 3,419,661 ¥ 12,258,213 ¥ 66,847 ¥ 15,744,721 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, 2018 were ¥21,517 million, and those at September 30, 2018 were ¥30,195 million, respectively. The amounts of unfunded commitments related to these private equity funds at March 31, 2018 were ¥61,463 million, and those at September 30, 2018 were ¥88,173 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, 2018. (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 private equity funds, whose fair values at March 31, 2018 was ¥35 million, and those at September 30, 2018 was ¥5 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, 2018. (5) Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments. (6) The table above reflects changes in presentation that were made to equity investment securities at March 31, 2018. See Note 1 for further information. (7) Excludes certain investments valued at net asset value of real estate funds whose fair values at September 30, 2018 were ¥14,578 million. The amounts of unfunded commitments related to these real estate funds at September 30, 2018 were ¥7,395 million. For the nature and details of real estate funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2018. Transfers Between Level 1 and Level 2 During the six months ended September 30, 2017 and 2018, the transfers between Level 1 and Level 2 were as follows: Six months ended September 30, 2017 2018 Transfers out of (1) Transfers out of (1) Transfers out of (1) Transfers out of (1) (in millions) Assets Investment securities: Equity securities Marketable equity securities ¥ 1,981 ¥ 3,839 ¥ 7,261 ¥ 8,122 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, 2017 and 2018. 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 (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 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) 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 — Equity securities 26,292 (648 ) (4) — 1,366 — (1,194 ) — — (252 ) 25,564 (1,280 ) (4) Nonmarketable equity securities 26,292 (648 ) — 1,366 — (1,194 ) — — (252 ) 25,564 (1,280 ) 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 ) Total gains (losses) Change in March 31, Included Included Purchases Issues Sales Settlements Transfers (5) Transfers (5) September 30, (in millions) Assets Trading account assets: Trading securities (1) ¥ 827,493 ¥ 42,948 (2) ¥ — ¥ 274,937 ¥ — ¥ (177,306 ) ¥ (181,133 ) ¥ 4,532 ¥ (15,067 ) ¥ 776,404 ¥ 40,167 (2) Debt securities Foreign governments and official institutions bonds 1,047 214 — 40,600 — (40,710 ) (16 ) — — 1,135 6 Corporate bonds 23,092 682 — 729 — (193 ) (1,375 ) 4,532 (6) (15,067 ) (6) 12,400 642 Residential mortgage-backed securities 41,141 667 — — — — (3,072 ) — — 38,736 636 Asset-backed securities 684,637 38,155 — 216,109 — (136,388 ) (175,579 ) — — 626,934 36,181 Other debt securities 33,450 2,346 — — — — — — — 35,796 2,346 Equity securities 44,126 884 — 17,499 — (15 ) (1,091 ) — — 61,403 356 Trading derivatives—net 12,119 3,739 (2) (545 ) 582 (429 ) — (34,413 ) 23,922 8,424 13,399 (7,391 ) (2) Interest rate contracts—net 14,596 2,127 (134 ) — (94 ) — (18,154 ) 311 (1,798 ) (3,146 ) 2,256 Foreign exchange contracts—net 6,736 (12,064 ) (262 ) 18 — — (2,614 ) 23,611 (6) (2,863 ) 12,562 (11,544 ) Equity contracts—net (10,685 ) 13,488 (153 ) — — — (13,690 ) — 13,085 (6) 2,045 964 Commodity contracts—net 683 156 4 564 (335 ) — (1 ) — — 1,071 900 Credit derivatives—net 789 32 — — — — 46 — — 867 33 Investment securities: Available-for-sale 350,660 6,323 (3) (9,056 ) 131,326 — — (181,004 ) 102 (89 ) 298,262 (83 ) (3) Foreign governments and official institutions bonds 20,192 — (1,002 ) 242 — — (487 ) — — 18,945 — Corporate bonds 6,037 4 (3 ) 1,670 — — (5,318 ) 102 (89 ) 2,403 (83 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed securities 2,430 — (104 ) — — — (33 ) — — 2,293 — Asset-backed securities 161,172 6,319 (2,806 ) 129,400 — — (163,469 ) — — 130,616 — Other debt securities 160,814 — (5,141 ) 14 — — (11,697 ) — — 143,990 — Equity securities 28,359 (1,199 ) (7) — 2,203 — (825 ) — — (125 ) 28,413 (1,602 ) (7) Nonmarketable equity securities 28,359 (1,199 ) — 2,203 — (825 ) — — (125 ) 28,413 (1,602 ) Others 8,660 966 (8) (22 ) 8,601 — (183 ) — — — 18,022 872 (8) Total ¥ 1,227,291 ¥ 52,777 ¥ (9,623 ) ¥ 417,649 ¥ (429 ) ¥ (178,314 ) ¥ (396,550 ) ¥ 28,556 ¥ (6,857 ) ¥ 1,134,500 ¥ 31,963 Liabilities Others ¥ (25,528 ) ¥ (5,160 ) (4) ¥ 2,262 ¥ — ¥ 848 ¥ — ¥ (11,902 ) ¥ 14,454 ¥ 24,235 ¥ 5,005 ¥ (1,049 ) (4) Total ¥ (25,528 ) ¥ (5,160 ) ¥ 2,262 ¥ — ¥ 848 ¥ — ¥ (11,902 ) ¥ 14,454 ¥ 24,235 ¥ 5,005 ¥ (1,049 ) Notes: (1 ) Includes Trading securities measured under the fair value option. (2 ) Included in Trading account profits (losses)—net and in Foreign exchange losses—net. (3 ) Included in Investment securities gains—net. (4 ) Included in Trading account profits (losses)—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 Level 3 for Foreign exchange contract were mainly caused by the valuation using certain unobservable input. Transfers into (out of) Level 3 for corporate bonds were mainly caused by the decrease (increase) in liquidity or the availability of the quoted prices provided by third-party venders and Equity contracts—net were mainly caused by the change of valuation model and the change cease using certain unobservable input. (7 ) Included in Investment securities gains—net. (8 ) Included in Other non-interest (9 ) The table above reflects changes in presentation that were made to equity investment securities at March 31, 2018. See Note 1 for further information. 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, 2018 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign governments and official institutions ¥ 20,192 Return on equity method Probability of default 0.0%~0.4% 0.2 % Recovery rate 60.0%~70.0% 66.7 % Market-required return on capital 8.0%~10.0% 9.5 % Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 110,536 Discounted cash flow Probability of default 1.2%~5.3% 4.5 % Recovery rate 60.0%~76.0% 66.3 % 684,586 Internal model (4) Asset correlations 9.0% 9.0 % Discount factor 1.0% 1.0 % Prepayment rate 37.2% 37.2 % Probability of default 0.0%~91.3% — (3) Recovery rate 65.3% 65.3 % Other debt securities 33,450 Discounted cash flow Liquidity premium 0.5%~2.4% 0.8 % 149,759 Return on equity method Probability of default 0.0%~25.0% 0.3 % Recovery rate 40.0%~90.0% 72.5 % Market-required return on capital 8.0%~10.0% 9.7 % At March 31, 2018 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net 14,460 Option model Probability of default 0.0%~12.5% Correlation between interest rates 34.1%~52.7% Correlation between interest rate and foreign exchange rate 19.7%~50.4% Recovery rate 41.0%~46.0% Volatility 13.4%~100.0% Probability of prepayment 100.0% Foreign exchange contracts—net 6,779 Option model Probability of default 0.0%~12.5% Correlation between interest rates 40.3%~74.0% Correlation between interest rate and foreign exchange rate 28.1%~50.7% Recovery rate 41.0%~46.0% Correlation between underlying assets 85.0% Volatility 10.3%~16.2% Equity contracts—net (16,600 ) Option model Correlation between interest rate and equity 37.1%~39.0% Correlation between foreign exchange rate and equity 7.0%~65.2% Correlation between equities 20.6%~81.7% Correlation between underlying assets 76.0% 6,528 Discounted cash flow Term of litigation 2.0years At September 30, 2018 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 ¥ 18,945 Return on equity method Probability of default 0.0%~0.4% 0.3 % Recovery rate 60.0%~70.0% 66.6 % Market-required return on capital 10.0% 10.0 % Residential mortgage- backed securities, Commercial mortgage- backed securities and Asset-backed securities 79,186 Discounted cash flow Probability of default 1.2%~5.3% 5.0 % Recovery rate 60.0%~76.0% 66.9 % 626,934 Internal model (4) Asset correlations 9.0% 9.0 % Discount factor 1.0% 1.0 % Prepayment rate 28.0% 28.0 % Probability of default 0.0%~88.1% — (3) Recovery rate 67.6% 67.6 % Other debt securities 35,796 Discounted cash flow Liquidity premium 1.0%~2.4% 1.3 % 135,688 Return on equity method Probability of default 0.0%~25.0% 0.3 % Recovery rate 40.0%~90.0% 74.9 % Market-required return on capital 8.0%~10.0% 9.5 % At September 30, 2018 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net (3,283 ) Option model Probability of default 0.0%~11.9% Correlation between interest rates 31.4%~50.1% Correlation between interest rate and foreign exchange rate 23.0%~53.8% Recovery rate 41.0%~47.0% Volatility 13.6%~70.4% Probability of prepayment 100.0% Foreign exchange contracts—net 12,580 Option model Probability of default 0.0%~7.6% Correlation between interest rates 45.0%~74.0% Correlation between interest rate and foreign exchange rate 16.3%~53.8% Recovery rate 41.0%~47.0% Correlation between underlying assets 85.0% Volatility 11.2%~17.2% Equity contracts—net (3,767 ) Option model Correlation between interest rate and equity 41.6% Correlation between foreign exchange rate and equity 7.0%~65.4% Correlation between equities 24.3%~85.9% Correlation between underlying assets 76.0%~80.0% 6,410 Discounted cash flow Term of litigation 1.5 years Notes: (1 ) The fair value as of March 31, 2018 and September 30, 2018 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, 2018. (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, 2018. 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, 2018. 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, 2018 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 or the measurement alternative for nonmarketable equity securities. See Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2018 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, 2018 and September 30, 2018: March 31, 2018 September 30, 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Assets Investment securities (1)(2) ¥ — ¥ — ¥ 1,984 ¥ 1,984 ¥ — ¥ 9,619 ¥ 2,451 ¥ 12,070 Loans 3,458 8,329 239,653 251,440 3,575 10,385 228,659 242,619 Loans held for sale — — 22,835 22,835 — — 26,795 26,795 Collateral dependent loans 3,458 8,329 216,818 228,605 3,575 10,385 201,864 215,824 Premises and equipment — — 34,326 34,326 — — 13,600 13,600 Intangible assets — — 9,402 9,402 — — 416 416 Other assets 92,223 — 6,196 98,419 — 62,996 5,081 68,077 Investments in equity method investees (1) 92,223 — — 92,223 — 62,996 — 62,996 Other — — 6,196 6,196 — — 5,081 5,081 Total ¥ 95,681 ¥ 8,329 ¥ 291,561 ¥ 395,571 ¥ 3,575 ¥ 83,000 ¥ 250,207 ¥ 336,782 Notes: (1 ) Excludes certain investments valued at net asset value of ¥8,443 million and ¥7,296 million at March 31, 2018 and September 30, 2018, respectively. The unfunded commitments related to these investments are ¥1,544 million and ¥19 million at March 31, 2018 and September 30, 2018, 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, 2018. (2 ) Includes certain nonmarketable equity securities that are measured at fair value on a nonrecurring basis, including impairment and observable price change for nonmarketable equity securities measured under the measurement alternative. The following table presents losses (gains) 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, 2017 and 2018: Losses(gains) for the 2017 2018 (in millions) Investment securities ¥ 284 ¥ (8,013 ) Loans 25,781 23,727 Loans held for sale 249 3 Collateral dependent loans 25,532 23,724 Premises and equipment 6,227 3,552 Intangible assets 16,591 667 Other assets 28,395 10,696 Investments in equity method investees 27,985 10,034 Other 410 662 Total ¥ 77,278 ¥ 30,629 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, 2018. The following table presents the gains or losses recorded for the six months ended September 30, 2017 and 2018 related to the eligible instruments for which the MUFG Group elected the fair value option: Six months ended September 30, 2017 2018 Trading Foreign Total Trading Foreign Total (in millions) Financial assets: Trading account securities (1) ¥ 90,632 ¥ 460,947 ¥ 551,579 ¥ (157,359 ) ¥ 638,886 ¥ 481,527 Total ¥ 90,632 ¥ 460,947 ¥ 551,579 ¥ (157,359 ) ¥ 638,886 ¥ 481,527 Financial liabilities: Other short-term borrowings (2) ¥ 2,054 ¥ — ¥ 2,054 ¥ (1,446 ) ¥ — ¥ (1,446 ) Long-term debt (2) 1,172 — 1,172 (6,491 ) — (6,491 ) Total ¥ 3,226 ¥ — ¥ 3,226 ¥ (7,937 ) ¥ — ¥ (7,937 ) Notes: (1) Excludes Danamon’s equity securities. See Note 2 for reference. (2) 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, 2018 and September 30, 2018 for long-term debt instruments for which the fair value option has been elected: March 31, 2018 September 30, 2018 Remaining Fair value Fair value Remaining Fair value Fair value (in millions) Financial liabilities: Long-term debt ¥ 347,002 ¥ 333,985 ¥ (13,017 ) ¥ 378,216 ¥ 355,154 ¥ (23,062 ) Total ¥ 347,002 ¥ 333,985 ¥ (13,017 ) ¥ 378,216 ¥ 355,154 ¥ (23,062 ) 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, 2018 and September 30, 2018: At March 31, 2018 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 32,648 ¥ 32,648 ¥ 32,648 ¥ — ¥ — Interest-earning deposits in other banks 43,210 43,210 — 43,210 — Call loans and funds sold 896 896 — 896 — Receivables under resale agreements 5,726 5,726 — 5,726 — Receivables under securities borrowing transactions 9,269 9,269 — 9,269 — Investment securities (1)(2) 3,684 3,797 1,197 1,051 1,549 Loans, net of allowance for credit losses (3) 116,272 117,753 3 330 117,420 Other financial assets (4) 7,000 7,000 — 7,000 — Financial liabilities: Deposits Non-interest-bearing ¥ 29,862 ¥ 29,862 ¥ — ¥ 29,862 ¥ — Interest-bearing 165,831 165,825 — 165,825 — Total deposits 195,693 195,687 — 195,687 — Call money and funds purchased 2,453 2,453 — 2,453 — Payables under repurchase agreements 18,135 18,135 — 18,135 — Payables under securities lending transactions 8,170 8,170 — 8,170 — Due to trust account 3,386 3,386 — 3,386 — Other short-term borrowings 6,617 6,617 — 6,617 — Long-term debt 26,861 26,919 — 26,919 — Other financial liabilities 6,642 6,642 — 6,642 — At September 30, 2018 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 35,664 ¥ 35,664 ¥ 35,664 ¥ — ¥ — Interest-earning deposits in other banks 39,157 39,157 — 39,157 — Call loans and funds sold 877 877 — 877 — Receivables under resale agreements 11,266 11,266 — 11,266 — Receivables under securities borrowing transactions 3,113 3,113 — 3,113 — Investment securities 4,188 4,198 1,189 1,131 1,878 Loans, net of allowance for credit losses (3) 117,029 117,598 4 284 117,310 Other financial assets (4) 6,954 6,954 — 6,954 — Financial liabilities: Deposits Non-interest-bearing ¥ 29,649 ¥ 29,649 ¥ — ¥ 29,649 ¥ — Interest-bearing 163,249 163,248 — 163,248 — Total deposits 192,898 192,897 — 192,897 — Call money and funds purchased 2,344 2,344 — 2,344 — Payables under repurchase agreements 25,604 25,604 — 25,604 — Payables under securities lending transactions 1,900 1,900 — 1,900 — Due to trust account 3,029 3,029 — 3,029 — Other short-term borrowings 6,923 6,923 — 6,923 — Long-term debt 27,622 27,589 — 27,589 — Other financial liabilities 6,961 6,961 — 6,961 — Notes: (1) Includes impaired securities measured at fair value on a nonrecurring basis at March 31, 2018. 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 ¥437 billion at March 31, 2018, 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 ¥2,219 billion and ¥2,542 billion at March 31, 2018 and September 30, 2018, respectively. The fair values of certain off-balance

Investments in Equity Method In

Investments in Equity Method Investees [Text Block]	6 Months Ended
	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investments in Equity Method Investees [Text Block]	19. 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, 2017 and 2018 are as follows: 2017 2018 (in billions) Net revenues ¥ 2,077 ¥ 2,258 Total non-interest 1,508 1,601 Income from continuing operations before income taxes 569 657 Net income applicable to Morgan Stanley 393 502

Subsequent Events _Text Block_

Subsequent Events [Text Block]	6 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	20. SUBSEQUENT EVENTS Approval of Dividends On November 13, 2018, the Board of Directors of MUFG approved the payment of semi-annual interim cash dividends of ¥11 per share of Common stock, totaling ¥144,314 million, that were payable on December 5, 2018 to the shareholders of record on September 30, 2018. Repurchase and Cancellation of own shares From November 14, 2018 to December 10, 2018, MUFG repurchased 159,836,800 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 13, 2018. 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 1.52% 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, 2019, 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 13, 2018. Announcement to redeem “Non-dilutive” Preferred Securities Issued by a Special Purpose Company On December 4, 2018, the Board of Directors of MUFG approved to redeem in total ¥222 billion of non-cumulative and non-dilutive perpetual preferred securities issued by MUFG Capital Finance 7 Limited, a special purpose company established in the Cayman Islands. MUFG plans to redeem these securities on January 25, 2019. The securities were previously accounted for as part of MUFG’s Tier 1 capital at September 30, 2018 under its capital adequacy requirements, subject to certain limitations. A cquisition of Colonial First State Global Asset Management On October 31, 2018, Mitsubishi UFJ Trust and Banking entered into a Share Sale Deed with Commonwealth Bank of Australia (“CBA”), and its wholly-owned subsidiary, Colonial First State Group Limited (the “Seller”) to acquire 100% of the shares in each of nine subsidiaries of the Seller, which collectively represent CBA’s global asset management business known as Colonial First State Global Asset Management (“CFSGAM”), for approximately ¥328 billion or approximately Australian dollar 4.0 billion, subject to applicable regulatory and other approvals and certain conditions. CFSGAM is the third largest asset management group by assets under management in Asian markets excluding Japan, offers a wide range of products including equities, fixed income and alternatives, and has specialist capabilities in Asian and emerging equity markets, alternatives (property and infrastructure), as well as passive and other products. The investment in CFSGAM aims to meet various client needs by expanding product lineup and enhancing presence as the largest asset management firm in the Asia and Oceania region.

Basis of Semiannual Condensed_2

Basis of Semiannual Condensed Consolidated Financial Statements [Text Block] (Policies)	6 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Description of Business [Policy Text Block]	Description of Business Mitsubishi UFJ Financial Group, Inc. (“MUFG”) is a holding company for MUFG Bank, Ltd. (formerly, The Bank of Tokyo-Mitsubishi UFJ, Ltd., “MUFG Bank” or “BK”), Mitsubishi UFJ Trust and Banking Corporation (“Mitsubishi UFJ Trust and Banking” or “TB”), Mitsubishi UFJ Securities Holdings Co., Ltd. (“Mitsubishi UFJ Securities Holdings” or “SCHD”), Mitsubishi UFJ NICOS Co., Ltd. (“Mitsubishi UFJ NICOS”), and other subsidiaries. Mitsubishi UFJ Securities Holdings is an intermediate holding company for Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. (“Mitsubishi UFJ Morgan Stanley Securities”). 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 17 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, 2018. 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.
Reclassifications [Policy Text Block]	Reclassifications Certain reclassifications and format changes have been made to the prior period condensed consolidated financial statements to conform to the presentation for the six months ended September 30, 2018. These reclassifications and format changes include 1) the reclassifications of interest expense from “Long-term debt” to “Payables under repurchase agreements and securities lending transactions” within interest expense in the condensed consolidated statements of income, and cash flows from “Proceeds from issuance of long-term debt” and “Repayments of long-term debt” to “Net increase (decrease) in call money, funds purchased, and payables under repurchase agreements and securities lending transactions” in cash flows from financing activities in the condensed consolidated statements of cash flows, in relation to the reclassification of long-term repurchase agreements from “Long-term debt” to “Payables under repurchase agreements” in the condensed consolidated balance sheets that were made in the second half of the fiscal year ended March 31, 2018, and 2) reclassifications of equity investment securities from “Available-for-sale Available-for-sale Held-to-maturity Available-for-sale Available-for-sale
Accounting Changes [Policy Text Block]	Accounting Changes Restricted Cash beginning-of-period end-of-period Revenue from Contracts with Customers— Recognition and Measurement of Financial Assets and Financial Liabilities— available-for-sale Recognition of Breakage for Certain Prepaid Stored-Value Products— non-financial Classification of Certain Cash Receipts and Cash Payments— Intra-Entity Transfers of Assets Other Than Inventory— Clarifying the Definition of a Business Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Improving t he Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost non-service Scope of Modification Accounting
Recently Issued Accounting Pronouncements [Policy Text Block]	Recently Issued Accounting Pronouncements Leases— right-of-use gross-up right-of-use gross-up Measurement of Credit Losses on Financial Instruments available-for-sale Simplifying the Test for Goodwill Impairment Premium Amortization on Purchased Callable Debt Securities Targeted Improvements to Accounting for Hedging Activities Improvements to Nonemployee Share-Based Payment Accounting Disclosure Framework Changes to the Disclosure Requirements for Fair Value Measurement Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans Customer ’ s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract— internal-use internal-use internal-use capitalized-implementation-cost-related Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes

Investment Securities _Text B_2

Investment Securities [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Investment Securities [Table Text Block]	At March 31, 2018: Amortized cost Gross unrealized gains Gross unrealized losses Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 24,272,345 ¥ 299,402 ¥ 3,843 ¥ 24,567,904 Japanese prefectural and municipal bonds 1,532,143 7,808 2,520 1,537,431 Foreign governments and official institutions bonds 2,207,662 8,938 44,908 2,171,692 Corporate bonds 1,104,799 15,589 1,028 1,119,360 Residential mortgage-backed securities 1,632,346 752 15,563 1,617,535 Commercial mortgage-backed securities 95,383 473 620 95,236 Asset-backed securities 1,546,989 12,775 1,415 1,558,349 Other debt securities (1) 165,002 3,635 3,030 165,607 Total ¥ 32,556,669 ¥ 349,372 ¥ 72,927 ¥ 32,833,114 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,807 ¥ 40,212 ¥ — ¥ 1,141,019 Foreign governments and official institutions bonds 59,330 383 103 59,610 Residential mortgage-backed securities 885,965 1,660 14,726 (2) 872,899 Commercial mortgage-backed securities 171,647 4,107 1,018 (2) 174,736 Asset-backed securities 1,365,192 8,438 1,222 1,372,408 Total ¥ 3,582,941 ¥ 54,800 ¥ 17,069 ¥ 3,620,672 Equity securities: Marketable equity securities ¥ 2,789,392 ¥ 3,925,680 ¥ 43,488 ¥ 6,671,584 Total ¥ 2,789,392 ¥ 3,925,680 ¥ 43,488 ¥ 6,671,584 Notes: (1) Other debt securities in the table above include ¥152,374 million of private placement debt conduit bonds. (2) MUFG Americas Holdings Corporation (“MUFG Americas Holdings” or “MUAH”) reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity At September 30, 2018: Amortized cost Gross gains Gross unrealized losses Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 22,605,246 ¥ 241,338 ¥ 14,695 ¥ 22,831,889 Japanese prefectural and municipal bonds 1,777,026 5,325 6,084 1,776,267 Foreign governments and official institutions bonds 2,248,125 7,063 57,733 2,197,455 Corporate bonds 1,097,050 14,159 1,071 1,110,138 Residential mortgage-backed securities 1,521,850 496 26,597 1,495,749 Commercial mortgage-backed securities 109,708 48 3,136 106,620 Asset-backed securities 1,486,367 10,317 351 1,496,333 Other debt securities (1) 148,974 3,033 3,948 148,059 Total ¥ 30,994,346 ¥ 281,779 ¥ 113,615 ¥ 31,162,510 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,765 ¥ 33,485 ¥ — ¥ 1,134,250 Foreign governments and official institutions bonds 58,209 246 336 58,119 Residential mortgage-backed securities 991,682 701 29,568 (2) 962,815 Commercial mortgage-backed securities 165,786 1,321 2,001 (2) 165,106 Asset-backed securities 1,871,524 9,634 2,956 1,878,202 Total ¥ 4,187,966 ¥ 45,387 ¥ 34,861 ¥ 4,198,492 Notes: (1) Other debt securities in the table above include ¥135,688 million of private placement debt conduit bonds. (2) MUFG Americas Holdings 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 Amortized Fair value Fair value (in millions) Due in one year or less ¥ 33,162 ¥ 33,051 ¥ 9,096,329 Due from one year to five years 173,953 174,740 12,133,838 Due from five years to ten years 1,561,712 1,592,472 5,787,030 Due after ten years 2,419,139 2,398,229 4,145,313 Total ¥ 4,187,966 ¥ 4,198,492 ¥ 31,162,510
Investments by Length and Category in Continuous Loss Position [Table Text Block]	Less than 12 months 12 months or more Total At March 31, 2018: Fair value Gross Fair value Gross Fair value Gross Number of (in millions, except number of securities) Available-for-sale Japanese national government and Japanese government ¥ 4,767,893 ¥ 2,701 ¥ 187,000 ¥ 1,142 ¥ 4,954,893 ¥ 3,843 140 Japanese prefectural and municipal bonds 400,705 453 353,047 2,067 753,752 2,520 193 Foreign governments and official institutions bonds 846,818 16,955 818,937 27,953 1,665,755 44,908 157 Corporate bonds 312,993 856 74,717 172 387,710 1,028 150 Residential mortgage-backed securities 438,545 2,644 623,285 12,919 1,061,830 15,563 503 Commercial mortgage-backed securities 50,898 386 9,067 234 59,965 620 60 Asset-backed securities 144,073 1,403 5,345 12 149,418 1,415 29 Other debt securities 12,341 367 56,117 2,663 68,458 3,030 23 Total ¥ 6,974,266 ¥ 25,765 ¥ 2,127,515 ¥ 47,162 ¥ 9,101,781 ¥ 72,927 1,255 Held-to-maturity Foreign governments and official institutions bonds ¥ 55,837 ¥ 103 ¥ — ¥ — ¥ 55,837 ¥ 103 10 Residential mortgage-backed securities 299,286 3,487 451,968 11,239 751,254 14,726 332 Commercial mortgage-backed securities 2,150 2 169,065 1,016 171,215 1,018 32 Asset-backed securities 275,814 1,222 — — 275,814 1,222 11 Total ¥ 633,087 ¥ 4,814 ¥ 621,033 ¥ 12,255 ¥ 1,254,120 ¥ 17,069 385 Equity securities: Marketable equity securities ¥ 448,489 ¥ 43,482 ¥ 28 ¥ 6 ¥ 448,517 ¥ 43,488 116 Total ¥ 448,489 ¥ 43,482 ¥ 28 ¥ 6 ¥ 448,517 ¥ 43,488 116 Less than 12 months 12 months or more Total At September 30, 2018: Fair value Gross Fair value Gross Fair value Gross Number of (in millions, except number of securities) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 9,844,320 ¥ 12,969 ¥ 215,149 ¥ 1,726 ¥ 10,059,469 ¥ 14,695 247 Japanese prefectural and municipal bonds 965,127 2,736 401,458 3,348 1,366,585 6,084 344 Foreign governments and official institutions bonds 719,858 14,786 956,427 42,947 1,676,285 57,733 157 Corporate bonds 263,849 801 178,709 270 442,558 1,071 147 Residential mortgage-backed securities 491,920 9,216 466,314 17,381 958,234 26,597 522 Commercial mortgage-backed securities 90,747 2,542 10,959 594 101,706 3,136 106 Asset-backed securities 167,342 350 969 1 168,311 351 36 Other debt securities 35,662 1,069 42,771 2,879 78,433 3,948 25 Total ¥ 12,578,825 ¥ 44,469 ¥ 2,272,756 ¥ 69,146 ¥ 14,851,581 ¥ 113,615 1,584 Held-to-maturity Foreign governments and official institutions bonds ¥ 54,557 ¥ 336 ¥ — ¥ — ¥ 54,557 ¥ 336 10 Residential mortgage-backed securities 424,594 8,768 518,017 20,800 942,611 29,568 463 Commercial mortgage-backed securities 5,211 113 159,895 1,888 165,106 2,001 33 Asset-backed securities 586,940 2,956 — — 586,940 2,956 23 Total ¥ 1,071,302 ¥ 12,173 ¥ 677,912 ¥ 22,688 ¥ 1,749,214 ¥ 34,861 529
Roll-forward of Credit Loss Component Recognized in Earnings [Table Text Block]	Six months ended 2017 2018 (in millions) Balance at beginning of period ¥ 4,125 ¥ 3,498 Additions: Initial credit impairments 107 34 Subsequent credit impairments 1 51 Reductions: Securities sold or matured (403 ) (233 ) Balance at end of period ¥ 3,830 ¥ 3,350
Measurement Alternative of Equity Securities [Table Text Block]	Six months ended 2018 (in millions) Measurement alternative balance at September 30, 2018 ¥ 541,961 Measurement alternative impairment losses (1) ¥ (479 ) Measurement alternative downward changes for observable prices (1) (2) ¥ — Measurement alternative upward changes for observable prices (1) (2) ¥ 8,492 Notes: (1) Included in Investment securities gains—net. (2) Under the measurement alternative, nonmarketable equity securities are carried at cost plus or minus changes resulting from observable prices in orderly transactions for the identical or a similar investment of the same issuer.
Marketable Equity Securities [Member]
Net Realized Gains (Losses) on Sales of Equity Securities and Net Unrealized Gains (Losses) on Equity Securities Still Held at the Reporting Date [Table Text Block]	Six months ended 2018 (in millions) Net gains recognized during the period (1) ¥ 411,720 Less: Net gains recognized during the period on equity securities sold during the period 12,470 Net unrealized gains recognized during the reporting period still held at the reporting date ¥ 399,250 Note: (1) Included in Investment securities gains—net.

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Loans by Domicile and Industry of Borrower Segment Classification [Table Text Block]	March 31, 2018 September 30, (in millions) Domestic: Manufacturing ¥ 10,876,625 ¥ 10,717,304 Construction 781,262 698,783 Real estate 11,763,769 11,746,501 Services 2,689,086 2,576,921 Wholesale and retail 7,989,080 7,837,551 Banks and other financial institutions (1) 4,818,364 4,892,078 Communication and information services 1,551,533 1,550,557 Other industries 8,939,291 8,943,344 Consumer 16,287,332 15,964,092 Total domestic 65,696,342 64,927,131 Foreign: Governments and official institutions 920,538 836,116 Banks and other financial institutions (1) 12,851,570 13,029,862 Commercial and industrial 30,591,173 31,936,891 Other 7,270,928 7,228,511 Total foreign 51,634,209 53,031,380 Unearned income, unamortized premiums—net and deferred loan fees—net (294,656 ) (295,279 ) Total (2) ¥ 117,035,895 ¥ 117,663,232 Notes: (1) Loans to so-called “non-bank Non-bank (2) The above table includes loans held for sale of ¥226,923 million at March 31, 2018 and ¥238,564 million at September 30, 2018, respectively.
Nonaccrual Loans by Class [Table Text Block]	March 31, September 30, (in millions) Commercial Domestic ¥ 332,994 ¥ 307,725 Manufacturing 77,163 70,201 Construction 10,791 9,675 Real estate 33,317 26,098 Services 30,717 29,222 Wholesale and retail 108,175 101,210 Banks and other financial institutions 1,145 1,654 Communication and information services 13,815 13,151 Other industries 37,549 40,314 Consumer 20,322 16,200 Foreign-excluding MUAH and Krungsri 109,516 93,786 Residential 69,464 68,732 Card 61,387 61,694 MUAH 52,282 39,248 Krungsri 121,286 113,328 Total (1) ¥ 746,929 ¥ 684,513 Note: (1) The above table does not include loans held for sale of ¥61 million and ¥3,969 million at March 31, 2018 and September 30, 2018, respectively, and loans acquired with deteriorated credit quality of ¥6,659 million and ¥5,899 million, at March 31, 2018 and September 30, 2018, respectively.
Impaired Loans by Class [Table Text Block]	Recorded Loan Balance At March 31, 2018: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 626,469 ¥ 188,984 ¥ 815,453 ¥ 875,795 ¥ 331,851 Manufacturing 361,268 36,566 397,834 408,124 166,098 Construction 10,936 7,172 18,108 18,490 7,921 Real estate 43,553 23,053 66,606 71,809 10,665 Services 38,097 16,600 54,697 59,335 25,890 Wholesale and retail 128,661 49,628 178,289 189,404 94,832 Banks and other financial institutions 1,125 26 1,151 1,151 972 Communication and information services 18,782 7,852 26,634 28,082 16,041 Other industries 12,978 34,282 47,260 67,525 5,350 Consumer 11,069 13,805 24,874 31,875 4,082 Foreign-excluding MUAH and Krungsri 122,243 40,249 162,492 190,518 82,855 Loans acquired with deteriorated credit quality 7,837 — 7,837 15,470 4,324 Residential 105,089 6,261 111,350 134,777 16,928 Card 66,964 388 67,352 74,840 21,223 MUAH 48,895 33,650 82,545 94,565 7,743 Krungsri 58,529 25,565 84,094 90,957 29,402 Total (3) ¥ 1,036,026 ¥ 295,097 ¥ 1,331,123 ¥ 1,476,922 ¥ 494,326 Recorded Loan Balance At September 30, 2018: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 585,995 ¥ 191,468 ¥ 777,463 ¥ 834,391 ¥ 240,718 Manufacturing 351,225 36,331 387,556 397,682 88,726 Construction 8,117 6,563 14,680 15,238 6,355 Real estate 24,030 32,229 56,259 61,461 7,386 Services 33,550 15,285 48,835 52,350 23,329 Wholesale and retail 126,183 46,559 172,742 183,688 89,851 Banks and other financial institutions 1,771 25 1,796 1,796 1,583 Communication and information services 17,373 7,701 25,074 26,641 15,141 Other industries 13,004 35,894 48,898 67,095 5,376 Consumer 10,742 10,881 21,623 28,440 2,971 Foreign-excluding MUAH and Krungsri 124,631 23,959 148,590 169,822 69,774 Loans acquired with deteriorated credit quality 7,621 — 7,621 14,920 5,679 Residential 99,610 6,865 106,475 128,263 14,488 Card 65,783 391 66,174 73,590 21,686 MUAH 39,445 28,533 67,978 85,520 6,464 Krungsri 54,165 26,290 80,455 87,871 27,900 Total (3) ¥ 977,250 ¥ 277,506 ¥ 1,254,756 ¥ 1,394,377 ¥ 386,709 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’ original 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, 2018 and September 30, 2018 are accrual TDRs as follows: ¥536,748 million and ¥525,746 million—Commercial; ¥40,734 million and ¥36,915 million—Residential; ¥28,541 million and ¥27,377 million—Card; ¥39,333 million and ¥37,281 million—MUFG Americas Holdings; and ¥24,899 million and ¥26,453 million—Krungsri, respectively. (3) In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥61 million and ¥1,946 million at March 31, 2018 and September 30, 2018, respectively.
Average Recorded Loan Balance and Recognized Interest Income on Impaired Loans by Class [Table Text Block]	2017 2018 Average Recognized Average Recognized (in millions) Commercial Domestic ¥ 952,510 ¥ 4,830 ¥ 796,431 ¥ 5,846 Manufacturing 509,211 1,812 392,695 2,787 Construction 20,112 144 16,393 162 Real estate 77,940 574 61,434 544 Services 62,750 381 51,767 420 Wholesale and retail 190,328 1,109 175,516 1,385 Banks and other financial institutions 2,030 7 1,474 4 Communication and information services 24,872 192 25,854 246 Other industries 34,783 387 48,080 91 Consumer 30,484 224 23,218 207 Foreign-excluding MUAH and Krungsri 235,723 3,573 153,708 1,598 Loans acquired with deteriorated credit quality 8,817 563 7,648 194 Residential 123,441 846 108,914 856 Card 71,080 1,052 66,762 857 MUAH 64,293 898 66,505 955 Krungsri 71,176 1,788 83,239 2,640 Total ¥ 1,527,040 ¥ 13,550 ¥ 1,283,207 ¥ 12,946
Roll-forward of Accrual TDRs and Other Impaired Loans [Table Text Block]	2017 2018 (in millions) Accrual TDRs: Balance at beginning of period ¥ 819,819 ¥ 670,255 Additions (new accrual TDR status) (1) 65,483 40,021 Transfers to other impaired loans (including nonaccrual TDRs) (16,624 ) (9,623 ) Loans sold (16,776 ) (26 ) Principal payments and other (140,664 ) (46,855 ) Balance at end of period (1) ¥ 711,238 ¥ 653,772 Other impaired loans (including nonaccrual TDRs): Balance at beginning of period ¥ 896,031 ¥ 660,868 Additions (new other impaired loans (including nonaccrual TDRs) status) (1)(2) 145,885 97,596 Charge-off (57,238 ) (28,410 ) Transfers to accrual TDRs (20,000 ) (14,548 ) Loans sold (22,482 ) (2,496 ) Principal payments and other (137,124 ) (112,026 ) Balance at end of period (1) ¥ 805,072 ¥ 600,984 Notes: (1) 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. For the six months ended September 30, 2018, lease receivables of ¥538 million and ¥50 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 ¥3,642 million and ¥1,135 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2018. (2) Included in the additions of other impaired loans for the six months ended September 30, 2017 and 2018 are nonaccrual TDRs as follows: ¥6,489 million and ¥6,870 million—Card; ¥3,366 million and ¥9,809 million—MUFG Americas Holdings; and ¥6,108 million and ¥6,499 million—Krungsri, respectively.
TDRs by Class [Table Text Block]	2017 2018 Troubled Debt Troubled Debt Troubled Debt Troubled Debt Pre- Post- Recorded Pre- Post- Recorded (in millions) Commercial (1)(3) Domestic ¥ 28,645 ¥ 28,603 ¥ 2,996 ¥ 20,440 ¥ 20,440 ¥ 1,643 Manufacturing 12,502 12,460 368 4,594 4,594 74 Construction 142 142 — 43 43 — Real estate 1,107 1,107 10 561 561 — Services 2,343 2,343 680 1,505 1,505 436 Wholesale and retail 9,889 9,889 1,778 12,240 12,240 615 Banks and other financial institutions 246 246 — — — — Communication and information services 1,072 1,072 135 156 156 518 Other industries 425 425 — 312 312 — Consumer 919 919 25 1,029 1,029 — Foreign-excluding MUAH and Krungsri 9,983 9,983 — 5,649 5,649 — Loans acquired with deteriorated credit quality — — — — — — Residential (1)(3) 5,459 5,459 124 4,235 4,235 83 Card (2)(3) 9,570 9,334 1,977 10,382 9,953 1,810 MUAH (2)(3) 18,878 18,878 2,331 11,621 11,621 199 Krungsri (2)(3) 9,856 9,856 1,735 11,889 11,889 3,545 Total ¥ 82,391 ¥ 82,113 ¥ 9,163 ¥ 64,216 ¥ 63,787 ¥ 7,280 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans, and do not include nonaccrual loans. (2) TDRs for the Card, MUFG Americas Holdings and Krungsri segments include accrual and nonaccrual loans. (3) For the six months ended September 30, 2017 and 2018, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUFG Americas Holdings and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment.
Outstanding Recorded Investment Balances of TDRs by Class [Table Text Block]	March 31, September 30, (in millions) Commercial (1) Domestic ¥ 482,566 ¥ 469,793 Manufacturing 320,702 317,379 Construction 7,362 5,008 Real estate 33,289 30,160 Services 23,987 19,619 Wholesale and retail 70,119 71,529 Banks and other financial institutions 6 142 Communication and information services 12,837 11,939 Other industries 9,712 8,594 Consumer 4,552 5,423 Foreign-excluding MUAH and Krungsri 54,182 55,953 Residential (1) 40,734 36,915 Card (2) 67,352 66,174 MUAH (2) 65,373 63,543 Krungsri (2) 54,036 56,026 Total ¥ 764,243 ¥ 748,404 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans and do not include nonaccrual loans. (2) TDRs for the Card, MUFG Americas Holdings and Krungsri segments include accrual and nonaccrual loans. Included in the outstanding recorded investment balances as of March 31, 2018 and September 30, 2018 are nonaccrual TDRs as follows: ¥38,811 million and ¥38,797 million—Card; ¥26,040 million and ¥26,262 million—MUFG Americas Holdings; and ¥24,855 million and ¥25,931 million—Krungsri, respectively.
Credit Quality Indicators of Loans by Class [Table Text Block]	At March 31, 2018: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 49,050,274 ¥ 1,690,924 ¥ 271,456 ¥ 51,012,654 Manufacturing 10,215,497 596,662 57,730 10,869,889 Construction 727,932 43,673 9,116 780,721 Real estate 11,379,291 279,931 32,692 11,691,914 Services 2,467,540 175,733 24,081 2,667,354 Wholesale and retail 7,518,383 374,706 77,870 7,970,959 Banks and other financial institutions 4,800,281 10,923 1,145 4,812,349 Communication and information services 1,491,093 48,153 11,958 1,551,204 Other industries 8,780,517 120,466 36,951 8,937,934 Consumer 1,669,740 40,677 19,913 1,730,330 Foreign-excluding MUAH and Krungsri 36,049,123 569,137 108,276 36,726,536 Loans acquired with deteriorated credit quality 12,035 11,728 3,562 27,325 Total ¥ 85,111,432 ¥ 2,271,789 ¥ 383,294 ¥ 87,766,515 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 14,012,978 ¥ 67,258 ¥ 14,080,236 Card ¥ 528,108 ¥ 61,707 ¥ 589,815 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 4,360,445 ¥ 14,238 ¥ 4,509,044 ¥ 59,890 ¥ 116,842 ¥ 9,060,459 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 5,284,018 ¥ 198,526 ¥ 123,106 ¥ 5,605,650 At September 30, 2018: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 48,890,218 ¥ 1,341,229 ¥ 250,970 ¥ 50,482,417 Manufacturing 10,346,070 312,971 51,563 10,710,604 Construction 647,261 42,713 8,362 698,336 Real estate 11,404,353 252,057 25,158 11,681,568 Services 2,369,508 173,272 24,350 2,567,130 Wholesale and retail 7,414,787 345,008 72,928 7,832,723 Banks and other financial institutions 4,863,465 7,860 1,654 4,872,979 Communication and information services 1,494,291 44,645 11,340 1,550,276 Other industries 8,778,527 124,001 39,829 8,942,357 Consumer 1,571,956 38,702 15,786 1,626,444 Foreign-excluding MUAH and Krungsri 37,231,943 537,483 93,785 37,863,211 Loans acquired with deteriorated credit quality 11,194 12,391 3,270 26,855 Total ¥ 86,133,355 ¥ 1,891,103 ¥ 348,025 ¥ 88,372,483 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 13,794,000 ¥ 66,329 ¥ 13,860,329 Card ¥ 519,794 ¥ 61,995 ¥ 581,789 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 4,517,991 ¥ 13,596 ¥ 4,403,693 ¥ 57,260 ¥ 103,156 ¥ 9,095,696 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 5,496,214 ¥ 197,527 ¥ 115,084 ¥ 5,808,825 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 MUFG Americas Holdings do not include Federal Deposit Insurance Corporation (“FDIC”) covered loans which are not individually rated totaling ¥953 million and ¥825 million at March 31, 2018 and September 30, 2018, 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, 2018: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 13,290 ¥ 43,913 ¥ 57,203 ¥ 50,955,451 ¥ 51,012,654 ¥ 6,419 Manufacturing 1,495 1,300 2,795 10,867,094 10,869,889 — Construction 359 437 796 779,925 780,721 — Real estate 2,090 3,225 5,315 11,686,599 11,691,914 1,633 Services 1,025 620 1,645 2,665,709 2,667,354 26 Wholesale and retail 3,886 4,198 8,084 7,962,875 7,970,959 1,349 Banks and other financial institutions — 21 21 4,812,328 4,812,349 — Communication and information services 657 328 985 1,550,219 1,551,204 — Other industries 251 28,315 28,566 8,909,368 8,937,934 — Consumer 3,527 5,469 8,996 1,721,334 1,730,330 3,411 Foreign-excluding MUAH and Krungsri 12,512 19,655 32,167 36,694,369 36,726,536 1,083 Residential 78,073 19,399 97,472 13,974,118 14,071,590 10,806 Card 18,887 32,218 51,105 528,284 579,389 — MUAH 23,145 13,648 36,793 9,009,426 9,046,219 771 Krungsri 116,665 99,315 215,980 5,383,477 5,599,457 — Total ¥ 262,572 ¥ 228,148 ¥ 490,720 ¥ 116,545,125 ¥ 117,035,845 ¥ 19,079 At September 30, 2018: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 13,946 ¥ 46,030 ¥ 59,976 ¥ 50,422,441 ¥ 50,482,417 ¥ 5,551 Manufacturing 1,368 1,694 3,062 10,707,542 10,710,604 — Construction 589 313 902 697,434 698,336 13 Real estate 2,302 4,744 7,046 11,674,522 11,681,568 1,948 Services 707 789 1,496 2,565,634 2,567,130 — Wholesale and retail 4,181 1,960 6,141 7,826,582 7,832,723 73 Banks and other financial institutions — 24 24 4,872,955 4,872,979 — Communication and information services 1,170 181 1,351 1,548,925 1,550,276 — Other industries 229 30,648 30,877 8,911,480 8,942,357 — Consumer 3,400 5,677 9,077 1,617,367 1,626,444 3,517 Foreign-excluding MUAH and Krungsri 12,655 18,383 31,038 37,832,173 37,863,211 916 Residential 70,006 16,581 86,587 13,765,686 13,852,273 7,422 Card 17,700 32,058 49,758 528,174 577,932 — MUAH 21,226 13,764 34,990 9,048,818 9,083,808 763 Krungsri 121,122 94,001 215,123 5,587,828 5,802,951 — Total ¥ 256,655 ¥ 220,817 ¥ 477,472 ¥ 117,185,120 ¥ 117,662,592 ¥ 14,652 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 MUFG Americas Holdings do not include ¥5 million and nil of FDIC covered loans at March 31, 2018 and September 30, 2018, 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, 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 for (reversal of) 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 Six months ended September 30, 2018: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of period ¥ 491,098 ¥ 42,546 ¥ 32,119 ¥ 53,765 ¥ 144,596 ¥ 764,124 Provision for (reversal of) credit losses (104,297 ) (1,651 ) 12,400 1,423 21,065 (71,060 ) Charge-offs 22,432 1,648 12,401 7,909 30,213 74,603 Recoveries 6,616 416 500 1,448 10,119 19,099 Net charge-offs 15,816 1,232 11,901 6,461 20,094 55,504 Others (1) 3,368 — — (1,274 ) (5,045 ) (2,951 ) Balance at end of period ¥ 374,353 ¥ 39,663 ¥ 32,618 ¥ 47,453 ¥ 140,522 ¥ 634,609 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, 2018: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 414,706 ¥ 16,644 ¥ 21,223 ¥ 7,743 ¥ 29,402 ¥ 489,718 Collectively evaluated for impairment 64,375 24,718 10,884 45,571 115,161 260,709 Loans acquired with deteriorated credit quality 12,017 1,184 12 451 33 13,697 Total ¥ 491,098 ¥ 42,546 ¥ 32,119 ¥ 53,765 ¥ 144,596 ¥ 764,124 Loans: Individually evaluated for impairment ¥ 977,945 ¥ 110,197 ¥ 66,957 ¥ 82,545 ¥ 84,094 ¥ 1,321,738 Collectively evaluated for impairment 86,761,245 13,961,393 512,432 8,963,679 5,515,363 115,714,112 Loans acquired with deteriorated credit quality 27,325 8,646 10,426 15,188 6,193 67,778 Total (1) ¥ 87,766,515 ¥ 14,080,236 ¥ 589,815 ¥ 9,061,412 ¥ 5,605,650 ¥ 117,103,628 At September 30, 2018: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 310,492 ¥ 14,275 ¥ 21,686 ¥ 6,464 ¥ 27,900 ¥ 380,817 Collectively evaluated for impairment 50,080 24,042 10,921 40,655 112,592 238,290 Loans acquired with deteriorated credit quality 13,781 1,346 11 334 30 15,502 Total ¥ 374,353 ¥ 39,663 ¥ 32,618 ¥ 47,453 ¥ 140,522 ¥ 634,609 Loans: Individually evaluated for impairment ¥ 926,053 ¥ 105,647 ¥ 65,805 ¥ 67,978 ¥ 80,455 ¥ 1,245,938 Collectively evaluated for impairment 87,419,575 13,746,626 512,127 9,015,830 5,722,496 116,416,654 Loans acquired with deteriorated credit quality 26,855 8,056 3,857 12,713 5,874 57,355 Total (1) ¥ 88,372,483 ¥ 13,860,329 ¥ 581,789 ¥ 9,096,521 ¥ 5,808,825 ¥ 117,719,947 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_2

Goodwill and Other Intangible Assets [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Movement in Carrying Amount of Goodwill [Table Text Block]	Six months ended 2017 2018 (in millions) Balance at beginning of period Goodwill ¥ 2,542,280 ¥ 2,533,471 Accumulated impairment losses (2,092,137 ) (2,092,137 ) 450,143 441,334 Foreign currency translation adjustments and other (14,590 ) (10,179 ) Balance at end of period Goodwill 2,527,690 2,523,292 Accumulated impairment losses (2,092,137 ) (2,092,137 ) ¥ 435,553 ¥ 431,155
Carrying Amount of Other Intangible Assets by Major Class [Table Text Block]	March 31, September 30, (in millions) Intangible assets subject to amortization: Software ¥ 732,828 ¥ 755,547 Core deposit intangibles 45,297 40,543 Customer relationships 164,753 150,612 Trade names 47,020 44,494 Other 5,729 5,459 Total 995,627 996,655 Intangible assets not subject to amortization: Other (1) 15,492 25,198 Total ¥ 1,011,119 ¥ 1,021,853 Note: (1 ) Intangible assets not subject to amortization includes mortgage servicing rights accounted for at fair value of ¥7,268 million and ¥16,346 million at March 31, 2018 and September 30, 2018, respectively.

Pledged Assets and Collateral_2

Pledged Assets and Collateral [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Assets Mortgaged Pledged or Otherwise Subject to Lien [Table Text Block]	September 30, (in millions) Trading account securities ¥ 7,703,892 Investment securities 9,178,501 Loans 13,956,677 Other 50,714 Total ¥ 30,889,784
Pledged Assets Classified by Type of Liabilities [Table Text Block]	September 30, (in millions) Deposits ¥ 268,091 Call money and funds purchased 16,351 Payables under repurchase agreements and securities lending transactions 16,269,396 Other short-term borrowings and long-term debt 14,319,750 Other 16,196 Total ¥ 30,889,784

Severance Indemnities and Pen_2

Severance Indemnities and Pension Plans [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
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 2017 2018 2017 2018 Pension Pension Pension Other Pension Other (in millions) Service cost—benefits earned during the period ¥ 23,539 ¥ 24,205 ¥ 5,646 ¥ 348 ¥ 5,975 ¥ 271 Interest cost on projected benefit obligation 7,266 6,764 7,651 540 7,407 515 Expected return on plan assets (34,144 ) (37,170 ) (16,069 ) (1,062 ) (16,413 ) (1,139 ) Amortization of net actuarial loss 3,946 612 5,740 563 3,492 349 Amortization of prior service cost (580 ) (604 ) (1,547 ) (1,391 ) (1,496 ) (995 ) Gain on settlements and curtailment (2,019 ) (3,901 ) — — — — Net periodic benefit cost (income) ¥ (1,992 ) ¥ (10,094 ) ¥ 1,421 ¥ (1,002 ) ¥ (1,035 ) ¥ (999 )
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, 2018 ¥ 36.4 ¥ 1.2 ¥ 0.2 For the remainder of the fiscal year ending March 31, 2019 ¥ 8.1 ¥ 0.4 ¥ 0.2

Offsetting of Derivatives, Re_2

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Summary of Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Table Text Block]	At March 31, 2018 Gross amounts of Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 12,585 ¥ — ¥ 12,585 ¥ (9,664 ) ¥ (832 ) ¥ 2,089 Receivables under resale agreements 8,825 (3,099 ) 5,726 (5,171 ) (17 ) 538 Receivables under securities borrowing transactions 9,305 (36 ) 9,269 (9,208 ) (1 ) 60 Total ¥ 30,715 ¥ (3,135 ) ¥ 27,580 ¥ (24,043 ) ¥ (850 ) ¥ 2,687 Financial liabilities: Derivative liabilities ¥ 11,877 ¥ — ¥ 11,877 ¥ (9,631 ) ¥ (1,126 ) ¥ 1,120 Payables under repurchase agreements 21,169 (3,034 ) 18,135 (17,890 ) (31 ) 214 Payables under securities lending transactions 8,206 (36 ) 8,170 (8,139 ) (12 ) 19 Obligations to return securities received as collateral 3,177 — 3,177 (1,072 ) — 2,105 Total ¥ 44,429 ¥ (3,070 ) ¥ 41,359 ¥ (36,732 ) ¥ (1,169 ) ¥ 3,458 At September 30, 2018 Gross amounts of Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 11,661 ¥ — ¥ 11,661 ¥ (9,056 ) ¥ (567 ) ¥ 2,038 Receivables under resale agreements 13,720 (2,454 ) 11,266 (10,319 ) (19 ) 928 Receivables under securities borrowing transactions 3,137 (24 ) 3,113 (3,050 ) — 63 Total ¥ 28,518 ¥ (2,478 ) ¥ 26,040 ¥ (22,425 ) ¥ (586 ) ¥ 3,029 Financial liabilities: Derivative liabilities ¥ 11,665 ¥ — ¥ 11,665 ¥ (8,798 ) ¥ (1,407 ) ¥ 1,460 Payables under repurchase agreements 28,029 (2,425 ) 25,604 (25,077 ) (42 ) 485 Payables under securities lending transactions 1,924 (24 ) 1,900 (1,849 ) (7 ) 44 Obligations to return securities received as collateral 3,427 — 3,427 (1,290 ) — 2,137 Total ¥ 45,045 ¥ (2,449 ) ¥ 42,596 ¥ (37,014 ) ¥ (1,456 ) ¥ 4,126

Repurchase Agreements, and Se_2

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Gross Obligations by Remaining Contractual Maturity and Class of Collateral Pledged [Table Text Block]	March 31, 2018 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 2,290 ¥ 14,328 ¥ 2,004 ¥ 2,547 ¥ 21,169 Payables under securities lending transactions 4,647 2,343 1,216 — 8,206 Obligations to return securities received as collateral 2,855 202 120 — 3,177 Total ¥ 9,792 ¥ 16,873 ¥ 3,340 ¥ 2,547 ¥ 32,552 September 30, 2018 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 4,960 ¥ 16,192 ¥ 3,603 ¥ 3,274 ¥ 28,029 Payables under securities lending transactions 1,472 436 16 — 1,924 Obligations to return securities received as collateral 3,075 245 105 2 3,427 Total ¥ 9,507 ¥ 16,873 ¥ 3,724 ¥ 3,276 ¥ 33,380
Secured Borrowing by the Class of Collateral Pledged [Table Text Block]	March 31, 2018 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 2,462 ¥ 7,085 ¥ 1,242 ¥ 10,789 Foreign governments and official institutions bonds 14,316 36 1,344 15,696 Corporate bonds 570 — 84 654 Residential mortgage-backed securities 3,567 — — 3,567 Other debt securities 121 — — 121 Marketable equity securities 123 1,085 507 1,715 Others 10 — — 10 Total ¥ 21,169 ¥ 8,206 ¥ 3,177 ¥ 32,552 September 30, 2018 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 9,822 ¥ 691 ¥ 1,390 ¥ 11,903 Foreign governments and official institutions bonds 12,577 24 1,256 13,857 Corporate bonds 771 — 129 900 Residential mortgage-backed securities 4,517 — — 4,517 Other debt securities 85 — — 85 Marketable equity securities 103 1,208 648 1,959 Others 154 1 4 159 Total ¥ 28,029 ¥ 1,924 ¥ 3,427 ¥ 33,380

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Changes in Accumulated OCI, Net of Tax and Net of Noncontrolling Interests [Table Text Block]	Six months ended 2017 2018 (in millions) Accumulated other comprehensive income (loss), net of taxes: Net unrealized gains (losses) on investment securities: (1) Balance at beginning of period ¥ 2,032,807 ¥ 2,270,346 Net change during the period 253,088 (91,819 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (Note 1) — (2,700,331 ) Balance at end of period ¥ 2,285,895 ¥ (521,804 ) Net debt valuation adjustments: Balance at beginning of period ¥ (10,632 ) ¥ (16,488 ) Net change during the period (5,779 ) (2,226 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (Note 1) — (1,911 ) Balance at end of period ¥ (16,411 ) ¥ (20,625 ) Net unrealized losses on derivatives qualifying for cash flow hedges: Balance at beginning of period ¥ (8,729 ) ¥ (19,250 ) Net change during the period (626 ) (6,843 ) Balance at end of period ¥ (9,355 ) ¥ (26,093 ) Defined benefit plans: Balance at beginning of period ¥ (214,062 ) ¥ (119,593 ) Net change during the period 24,604 16,459 Balance at end of period ¥ (189,458 ) ¥ (103,134 ) Foreign currency translation adjustments: Balance at beginning of period ¥ 482,039 ¥ 362,300 Net change during the period (37,968 ) 37,116 Balance at end of period ¥ 444,071 ¥ 399,416 Balance at end of period ¥ 2,514,742 ¥ (272,240 ) Note: (1) Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018.
Before Tax and Net of Tax Changes in Each Component of Accumulated OCI [Table Text Block]	Six months ended September 30, 2017 2018 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 (1) ¥ 540,758 ¥ (169,917 ) ¥ 370,841 ¥ (94,429 ) ¥ 29,952 ¥ (64,477 ) Reclassification adjustment for gains included in net income before attribution of noncontrolling interests (175,398 ) 52,011 (123,387 ) (14,494 ) 4,626 (9,868 ) Net change 365,360 (117,906 ) 247,454 (108,923 ) 34,578 (74,345 ) Net unrealized gains (losses) on investment securities attributable to noncontrolling interests (5,634 ) 17,474 Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group 253,088 (91,819 ) Net debt valuation adjustments: Net debt valuation adjustments (8,218 ) 2,516 (5,702 ) (4,038 ) 1,236 (2,802 ) Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests (111 ) 34 (77 ) 829 (253 ) 576 Net change (8,329 ) 2,550 (5,779 ) (3,209 ) 983 (2,226 ) Net debt valuation adjustments attributable to noncontrolling interests — — Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group (5,779 ) (2,226 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Net unrealized gains (losses) on derivatives qualifying for cash flow hedges 4,450 (1,641 ) 2,809 (10,138 ) 2,774 (7,364 ) Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests (5,584 ) 2,149 (3,435 ) 735 (214 ) 521 Net change (1,134 ) 508 (626 ) (9,403 ) 2,560 (6,843 ) Net unrealized gains on derivatives qualifying for cash flow hedges attributable to noncontrolling interests — — Net unrealized losses on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group (626 ) (6,843 ) Defined benefit plans: Defined benefit plans 31,778 (10,240 ) 21,538 26,282 (8,022 ) 18,260 Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests 4,659 (1,588 ) 3,071 (2,643 ) 878 (1,765 ) Net change 36,437 (11,828 ) 24,609 23,639 (7,144 ) 16,495 Defined benefit plans attributable to noncontrolling interests 5 36 Defined benefit plans attributable to Mitsubishi UFJ Financial Group 24,604 16,459 Foreign currency translation adjustments: Foreign currency translation adjustments (35,954 ) (2,932 ) (38,886 ) 63,376 (35,893 ) 27,483 Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests 2,961 — 2,961 (2,685 ) 851 (1,834 ) Net change (32,993 ) (2,932 ) (35,925 ) 60,691 (35,042 ) 25,649 Foreign currency translation adjustments attributable to noncontrolling interests 2,043 (11,467 ) Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group (37,968 ) 37,116 Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group ¥ 233,319 ¥ (47,313 ) Note: (1) Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018.
Reclassification of Significant Items out of Accumulated OCI [Table Text Block]	Six months ended 2017 2018 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 (1) ¥ (181,530 ) ¥ (14,476 ) Investment securities gains—net Other 6,132 (18 ) (175,398 ) (14,494 ) Total before tax 52,011 4,626 Income tax expense ¥ (123,387 ) ¥ (9,868 ) Net of tax Net debt valuation adjustments ¥ (111 ) ¥ 829 Equity in earnings of equity method investees—net (111 ) 829 Total before tax 34 (253 ) Income tax expense ¥ (77 ) ¥ 576 Net of tax Net unrealized losses (gains) on derivatives qualifying for cash flow hedges Interest rate contracts ¥ (5,471 ) ¥ 816 Interest income on Loans, including fees Other (113 ) (81 ) (5,584 ) 735 Total before tax 2,149 (214 ) Income tax expense ¥ (3,435 ) ¥ 521 Net of tax Defined benefit plans Net actuarial loss (2) ¥ 10,249 ¥ 4,452 Other non-interest Prior service cost (2) (3,518 ) (3,095 ) Other non-interest Loss (gain) on settlements and curtailment, and other ( 2 ) (2,072 ) (4,000 ) Other non-interest 4,659 (2,643 ) Total before tax (1,588 ) 878 Income tax expense ¥ 3,071 ¥ (1,765 ) Net of tax Foreign currency translation adjustments ¥ — ¥ (2,686 ) Other non-interest 2,961 1 Other non-interest 2,961 (2,685 ) Total before tax — 851 Income tax expense ¥ 2,961 ¥ (1,834 ) Net of tax Total reclassifications for the period ¥ (173,473 ) ¥ (18,258 ) Total before tax 52,606 5,888 Income tax expense ¥ (120,867 ) ¥ (12,370 ) Net of tax Notes: (1 ) Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018, while included unrealized gains (losses) related to both debt and equity securities in six months ended on September 30, 2017. (2 ) These Accumulated OCI components are components of net periodic benefit cost. See Note 7 for more information.

Noncontrolling Interests _Tex_2

Noncontrolling Interests [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Noncontrolling Interest [Abstract]
Effect on MUFG's Shareholders' Equity from Changes in Ownership of Subsidiaries [Table Text Block]	Six months ended 2017 2018 (in millions) Net income attributable to Mitsubishi UFJ Financial Group ¥ 790,704 ¥ 553,251 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 36 Net transfers from (to) the noncontrolling interest shareholders (34,697 ) 36 Change from net income attributable to Mitsubishi UFJ Financial Group and transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders ¥ 756,007 ¥ 553,287

Derivative Financial Instrume_2

Derivative Financial Instruments [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
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 ¥ 1,219.7 ¥ 1,359.2 Foreign exchange contracts 220.8 223.9 Equity contracts 6.1 6.9 Commodity contracts 0.3 0.2 Credit derivatives 6.5 6.7 Others 3.1 2.9 Total ¥ 1,456.5 ¥ 1,599.8 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, 2018 (1)(5) September 30, 2018 (1)(5) Not designated (2) Designated (3) Total (4) Not designated (2) Designated (3) Total (4) (in billions) Derivative assets: Interest rate contracts ¥ 8,712 ¥ — ¥ 8,712 ¥ 7,808 ¥ — ¥ 7,808 Foreign exchange contracts 3,557 — 3,557 3,538 — 3,538 Equity contracts 207 — 207 219 — 219 Commodity contracts 35 — 35 31 — 31 Credit derivatives 72 — 72 63 — 63 Others 2 — 2 2 — 2 Total derivative assets ¥ 12,585 ¥ — ¥ 12,585 ¥ 11,661 ¥ — ¥ 11,661 Derivative liabilities: Interest rate contracts ¥ 8,674 ¥ 17 ¥ 8,691 ¥ 7,916 ¥ — ¥ 7,916 Foreign exchange contracts 3,000 — 3,000 3,496 — 3,496 Equity contracts 227 — 227 268 — 268 Commodity contracts 33 — 33 30 — 30 Credit derivatives 71 — 71 72 — 72 Others (6) (145 ) — (145 ) (117 ) — (117 ) Total derivative liabilities ¥ 11,860 ¥ 17 ¥ 11,877 ¥ 11,665 ¥ — ¥ 11,665 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 MUFG Americas Holdings. 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, 2018. (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, 2017: Interest rate contracts ¥ — ¥ (8 ) ¥ (8 ) Foreign exchange contracts (158 ) — (158 ) Equity contracts — (146 ) (146 ) Credit derivatives — (1 ) (1 ) Others (1 ) (38 ) (39 ) Total ¥ (159 ) ¥ (193 ) ¥ (352 ) Six months ended September 30, 2018: Interest rate contracts ¥ — ¥ (53 ) ¥ (53 ) Foreign exchange contracts (287 ) — (287 ) Equity contracts — (115 ) (115 ) Credit derivatives — (5 ) (5 ) Others (5 ) (55 ) (60 ) Total ¥ (292 ) ¥ (228 ) ¥ (520 )
Gains and Losses for Derivatives Designated as Cash Flow Hedges [Table Text Block]	Six months ended September 30, 2017 2018 (in billions) Gains (losses) recognized in Accumulated OCI on derivative instruments (Effective portion) Interest rate contracts ¥ 4 ¥ (11 ) Total ¥ 4 ¥ (11 ) Gains (losses) reclassified from Accumulated OCI into income (Effective portion) Interest rate contracts (1) ¥ 6 ¥ (1 ) Total ¥ 6 ¥ (1 ) 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, 2018: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 440,610 ¥ 1,199,269 ¥ 85,094 ¥ 1,724,973 ¥ (33,389 ) Non-investment 168,102 259,497 4,775 432,374 (3,431 ) Not rated — 45,425 — 45,425 8 Total 608,712 1,504,191 89,869 2,202,772 (36,812 ) Index and basket credit default swaps held by BK: Investment grade (2) 3,000 118,359 37,781 159,140 (3,381 ) Non-investment 7,000 82,867 — 89,867 (1,311 ) Total 10,000 201,226 37,781 249,007 (4,692 ) Index and basket credit default swaps held by SCHD: Investment grade (2) 15,000 108,000 6,000 129,000 (2,641 ) Non-investment 12,000 29,000 — 41,000 (749 ) Not rated 42,439 260,951 1,863 305,253 (16,294 ) Total 69,439 397,951 7,863 475,253 (19,684 ) Total index and basket credit default swaps sold 79,439 599,177 45,644 724,260 (24,376 ) Total credit default swaps sold 688,151 2,103,368 135,513 2,927,032 (61,188 ) Other credit derivatives sold (3) Investment grade — 74,368 — 74,368 (24 ) Total credit derivatives ¥ 688,151 ¥ 2,177,736 ¥ 135,513 ¥ 3,001,400 ¥ (61,212 ) Protection sold Maximum potential/Notional amount by Fair value At September 30, 2018: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 365,541 ¥ 1,392,067 ¥ 119,690 ¥ 1,877,298 ¥ (31,119 ) Non-investment 135,585 275,649 5,754 416,988 (1,295 ) Not rated — 4,090 — 4,090 (19 ) Total 501,126 1,671,806 125,444 2,298,376 (32,433 ) Index and basket credit default swaps held by BK: Investment grade (2) 7,000 150,293 — 157,293 (2,966 ) Non-investment — 103,349 — 103,349 (1,602 ) Total 7,000 253,642 — 260,642 (4,568 ) Index and basket credit default swaps held by SCHD: Investment grade (2) 28,030 177,690 8,869 214,589 (4,136 ) Not rated 13,422 208,872 1,764 224,058 (5,861 ) Total 41,452 386,562 10,633 438,647 (9,997 ) Total index and basket credit default swaps sold 48,452 640,204 10,633 699,289 (14,565 ) Total credit default swaps sold 549,578 2,312,010 136,077 2,997,665 (46,998 ) Other credit derivatives sold (3) Investment grade — 79,499 — 79,499 5,315 Total credit derivatives ¥ 549,578 ¥ 2,391,509 ¥ 136,077 ¥ 3,077,164 ¥ (41,683 ) 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 _2

Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
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 ¥ 4,311 ¥ 4,067 Performance guarantees 3,051 3,243 Derivative instruments (1)(2) 40,513 52,204 Liabilities of trust accounts 9,444 9,282 Others 22 25 Total ¥ 57,341 ¥ 68,821 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, 2018: Maximum Amount by borrower grade Normal Close (1) Likely to (1) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 4,311 ¥ 4,211 ¥ 83 ¥ 13 ¥ 4 Performance guarantees 3,051 2,910 113 5 23 Total ¥ 7,362 ¥ 7,121 ¥ 196 ¥ 18 ¥ 27 At September 30, 2018: Maximum Amount by borrower grade Normal Close (1) Likely to (1) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 4,067 ¥ 3,973 ¥ 72 ¥ 18 ¥ 4 Performance guarantees 3,243 3,166 45 8 24 Total ¥ 7,310 ¥ 7,139 ¥ 117 ¥ 26 ¥ 28 Note: (1 ) See Notes of the tables regarding “the maximum potential amount of future payments classified based upon internal credit ratings “in Note 25 to the consolidated financial statements for the fiscal year ended March 31, 2018.
Contractual Amounts with Regard to Other Off-balance Sheet Instruments [Table Text Block]	March 31, September 30, (in billions) Commitments to extend credit ¥ 80,090 ¥ 79,308 Commercial letters of credit 1,191 1,123 Commitments to make investments 183 236 Other 13 6

Variable Interest Entities _T_2

Variable Interest Entities [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Consolidated VIEs [Member]
Assets and Liabilities of Variable Interest Entities [Table Text Block]	Consolidated VIEs Consolidated assets At March 31, 2018: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 7,390,029 ¥ 52,703 ¥ 44,902 ¥ 2,273 ¥ 1,777,017 ¥ 5,502,892 ¥ 10,242 Investment funds 598,662 — 10,300 461,036 19,895 — 107,431 Special purpose entities created for structured financing 198,484 — 2,332 — — 149,194 46,958 Repackaged instruments 152,781 520 — 17,376 92,210 42,632 43 Securitization of the MUFG Group’s assets 10,852,539 — — — — 10,827,488 25,051 Trust arrangements 7,177,407 — 10,541 702 152,277 7,011,255 2,632 Others 44,247 361 14,236 — 42 12,963 16,645 Total consolidated assets before elimination 26,414,149 53,584 82,311 481,387 2,041,441 23,546,424 209,002 The amounts eliminated in consolidation (7,223,156 ) (53,454 ) (59,150 ) (3,804 ) (88,758 ) (6,996,317 ) (21,673 ) Total consolidated assets ¥ 19,190,993 ¥ 130 ¥ 23,161 ¥ 477,583 ¥ 1,952,683 ¥ 16,550,107 ¥ 187,329 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 7,409,190 ¥ — ¥ 5,176,663 ¥ 1,708,354 ¥ 524,173 Investment funds 11,735 — — — 11,735 Special purpose entities created for structured financing 115,353 — 587 112,054 2,712 Repackaged instruments 148,928 — 12,676 132,012 4,240 Securitization of the MUFG Group’s assets 10,816,672 — 5,000 10,806,145 5,527 Trust arrangements 7,171,852 7,103,738 655 — 67,459 Others 43,030 — 24,747 1,603 16,680 Total consolidated liabilities before elimination 25,716,760 7,103,738 5,220,328 12,760,168 632,526 The amounts eliminated in consolidation (15,347,991 ) — (3,028,987 ) (12,248,680 ) (70,324 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,745,330 ) (7,103,738 ) (2,162,890 ) (540 ) (478,162 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 623,439 ¥ — ¥ 28,451 ¥ 510,948 ¥ 84,040 Consolidated VIEs Consolidated assets At September 30, 2018: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 6,964,990 ¥ 44,532 ¥ 22,700 ¥ 4,708 ¥ 1,624,529 ¥ 5,245,861 ¥ 22,660 Investment funds 579,356 72 6,681 423,465 18,566 — 130,572 Special purpose entities created for structured financing 211,059 — 1,760 — — 143,800 65,499 Repackaged instruments 276,805 349 — 25,528 163,082 87,106 740 Securitization of the MUFG Group’s assets 10,650,823 — — — — 10,625,617 25,206 Trust arrangements 7,325,138 — 11,225 131 233,928 7,077,817 2,037 Others 35,414 364 1,313 — 40 11,139 22,558 Total consolidated assets before elimination 26,043,585 45,317 43,679 453,832 2,040,145 23,191,340 269,272 The amounts eliminated in consolidation (7,264,990 ) (41,951 ) (25,078 ) (7,351 ) (75,838 ) (7,063,476 ) (51,296 ) Total consolidated assets ¥ 18,778,595 ¥ 3,366 ¥ 18,601 ¥ 446,481 ¥ 1,964,307 ¥ 16,127,864 ¥ 217,976 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 6,977,482 ¥ — ¥ 4,830,851 ¥ 1,639,594 ¥ 507,037 Investment funds 42,479 — — 5,152 37,327 Special purpose entities created for structured financing 128,028 — 372 125,221 2,435 Repackaged instruments 276,100 — 45,699 173,690 56,711 Securitization of the MUFG Group’s assets 10,612,411 — — 10,606,699 5,712 Trust arrangements 7,319,352 7,140,178 — — 179,174 Others 34,070 — 9,997 1,530 22,543 Total consolidated liabilities before elimination 25,389,922 7,140,178 4,886,919 12,551,886 810,939 The amounts eliminated in consolidation (14,996,741 ) (24,079 ) (2,825,212 ) (12,026,663 ) (120,787 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,753,211 ) (7,116,099 ) (2,045,306 ) (745 ) (591,061 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 639,970 ¥ — ¥ 16,401 ¥ 524,478 ¥ 99,091
Non-consolidated VIEs [Member]
Assets and Liabilities of Variable Interest Entities [Table Text Block]	Non-consolidated On-balance On-balance sheet At March 31, 2018: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 29,011,749 ¥ 5,721,627 ¥ 4,645,697 ¥ 620 ¥ 1,541,591 ¥ 3,103,486 ¥ — ¥ — ¥ — Investment funds 45,090,381 1,776,366 1,525,127 213,722 891,062 413,855 6,488 17,919 17,919 Special purpose entities created for structured financing 35,437,349 4,016,999 3,193,621 309,560 116,961 2,697,126 69,974 7,217 7,217 Repackaged instruments 10,212,933 2,576,619 2,487,377 759,591 1,421,716 236,852 69,218 — — Others 49,582,444 3,760,375 2,740,529 94,882 61,192 2,482,141 102,314 24,830 24,830 Total ¥ 169,334,856 ¥ 17,851,986 ¥ 14,592,351 ¥ 1,378,375 ¥ 4,032,522 ¥ 8,933,460 ¥ 247,994 ¥ 49,966 ¥ 49,966 Non-consolidated VIEs On-balance On-balance sheet At September 30, 2018: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 31,417,028 ¥ 6,192,648 ¥ 4,901,268 ¥ 284 ¥ 1,591,198 ¥ 3,309,786 ¥ — ¥ — ¥ — Investment funds 52,638,790 2,061,803 1,873,732 456,304 1,115,847 293,763 7,818 551 551 Special purpose entities created for structured financing 41,827,348 4,278,002 3,326,807 215,302 95,901 3,015,060 544 12,971 12,971 Repackaged instruments 11,133,879 2,973,296 2,894,459 705,482 1,896,859 225,887 66,231 — — Others 71,873,766 3,941,479 2,860,875 130,234 57,189 2,573,669 99,783 23,245 23,245 Total ¥ 208,890,811 ¥ 19,447,228 ¥ 15,857,141 ¥ 1,507,606 ¥ 4,756,994 ¥ 9,418,165 ¥ 174,376 ¥ 36,767 ¥ 36,767

Fees and Commissions Income __2

Fees and Commissions Income [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Details of fees and commissions income [Table Text Block]	2017 2018 (in millions) Fees and commissions on deposits ¥ 27,100 ¥ 26,568 Fees and commissions on remittances and transfers 82,896 84,342 Fees and commissions on foreign trading business 37,002 35,453 Fees and commissions on credit card business 102,992 110,223 Fees and commissions on security-related services 127,151 119,007 Fees and commissions on administration and management services for investment funds 80,643 74,928 Trust fees 55,086 57,459 Guarantee fees (1) 21,609 22,205 Insurance commissions 25,302 23,469 Fees and commissions on real estate business 18,140 17,878 Other fees and commissions (2) 123,995 133,906 Total ¥ 701,916 ¥ 705,438 Notes: (1 ) Guarantee fees are not within the scope of the guidance on revenue from contracts with customers (2 ) Other fees and commissions include non-refundable

Business Segments _Text Block_

Business Segments [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Financial Information by Business Segment [Table Text Block]	Customer Business Retail & Japanese Global Global Asset Total Global Other Total (1) (in billions) Six months ended September 30, 2017: Net revenue: ¥ 766.9 ¥ 252.2 ¥ 195.3 ¥ 314.5 ¥ 93.1 ¥ 1,622.0 ¥ 373.9 ¥ 41.3 ¥ 2,037.2 BK and TB (2) 382.9 214.1 124.7 (1.5 ) 41.7 761.9 278.4 69.3 1,109.6 Net interest income 234.0 77.8 48.6 (1.5 ) — 358.9 121.9 111.6 592.4 Net fees 133.6 109.0 78.0 — 41.7 362.3 (9.3 ) (34.9 ) 318.1 Other 15.3 27.3 (1.9 ) — — 40.7 165.8 (7.4 ) 199.1 Other than BK and TB 384.0 38.1 70.6 316.0 51.4 860.1 95.5 (28.0 ) 927.6 Operating expenses 609.5 148.8 122.6 227.4 58.7 1,167.0 113.9 79.3 1,360.2 Operating profit (loss) ¥ 157.4 ¥ 103.4 ¥ 72.7 ¥ 87.1 ¥ 34.4 ¥ 455.0 ¥ 260.0 ¥ (38.0 ) ¥ 677.0 Six months ended September 30, 2018: Net revenue: ¥ 754.5 ¥ 260.5 ¥ 200.6 ¥ 343.8 ¥ 104.4 ¥ 1,663.8 ¥ 258.3 ¥ 12.1 ¥ 1,934.2 BK and TB (2) 363.3 203.7 136.5 (0.9 ) 49.0 751.6 166.2 97.5 1,015.3 Net interest income 233.1 75.6 57.9 (0.9 ) — 365.7 103.7 189.8 659.2 Net fees 115.4 98.9 78.3 — 49.0 341.6 (9.1 ) (31.1 ) 301.4 Other 14.8 29.2 0.3 — — 44.3 71.6 (61.2 ) 54.7 Other than BK and TB 391.2 56.8 64.1 344.7 55.4 912.2 92.1 (85.4 ) 918.9 Operating expenses 608.8 144.9 123.4 239.5 60.6 1,177.2 113.1 73.4 1,363.7 Operating profit (loss) ¥ 145.7 ¥ 115.6 ¥ 77.2 ¥ 104.3 ¥ 43.8 ¥ 486.6 ¥ 145.2 ¥ (61.3 ) ¥ 570.5 Notes: (1) Prior period business segment information has been restated to reflect the transfer of corporate loan-related businesses of Mitsubishi UFJ Trust and Banking to MUFG Bank. In accordance with internal management accounting rules and practices, the transfer resulted in a decrease of the total operating profit by ¥11.8 billion for the six months ended September 30, 2017. (2) “BK and TB” is a sum of MUFG Bank on a stand-alone basis and Mitsubishi UFJ Trust and Banking on a stand-alone basis.
Reconciliation of Operating Profit (Loss) from Segments to Condensed Consolidated Statements of Income [Table Text Block]	Six months ended 2017 2018 (in billions) Operating profit ¥ 677 ¥ 571 Reversal of credit losses 187 71 Foreign exchange gains (losses)—net 23 (43 ) Trading account losses—net (50 ) (330 ) Equity investment securities gains—net 95 391 Debt investment securities gains (losses)—net (5 ) 14 Equity in earnings of equity method investees—net 89 140 Provision for off-balance (1 ) (42 ) Other—net (1 ) (76 ) Income before income tax expense ¥ 1,014 ¥ 696

Fair Value _Text Block_ (Tables

Fair Value [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Assets and Liabilities Measured at Fair Value by Level on Recurring Basis [Table Text Block]	At March 31, 2018 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 10,876,424 ¥ 10,876,080 ¥ 827,493 ¥ 22,579,997 Debt securities Japanese national government and Japanese government agency bonds 1,388,143 477,530 — 1,865,673 Japanese prefectural and municipal bonds — 189,756 — 189,756 Foreign governments and official institutions bonds 8,190,781 469,342 1,047 8,661,170 Corporate bonds — 3,255,503 23,092 3,278,595 Residential mortgage-backed securities — 4,432,307 41,141 4,473,448 Asset-backed securities — 186,351 684,637 870,988 Other debt securities — 2,800 33,450 36,250 Commercial paper — 1,210,775 — 1,210,775 Equity securities (2) 1,297,500 651,716 44,126 1,993,342 Trading derivative assets 71,175 12,420,100 93,900 12,585,175 Interest rate contracts 3,320 8,681,427 27,092 8,711,839 Foreign exchange contracts 1,890 3,543,413 12,118 3,557,421 Equity contracts 65,965 118,351 22,994 207,310 Commodity contracts — 6,239 30,753 36,992 Credit derivatives — 70,670 943 71,613 Investment securities: Available-for-sale 23,105,682 9,376,772 350,660 32,833,114 Japanese national government and Japanese government agency bonds 21,522,128 3,045,776 — 24,567,904 Japanese prefectural and municipal bonds — 1,537,431 — 1,537,431 Foreign governments and official institutions bonds 1,583,554 567,946 20,192 2,171,692 Corporate bonds — 1,113,323 6,037 1,119,360 Residential mortgage-backed securities — 1,617,520 15 1,617,535 Commercial mortgage-backed securities — 92,806 2,430 95,236 Asset-backed securities — 1,397,177 161,172 1,558,349 Other debt securities — 4,793 160,814 165,607 Equity securities (6) 6,255,413 416,171 28,359 6,699,943 Marketable equity securities 6,255,413 416,171 — 6,671,584 Nonmarketable equity securities — — 28,359 28,359 Others (3)(4) 955,548 93,042 8,660 1,057,250 Total ¥ 41,264,242 ¥ 33,182,165 ¥ 1,309,072 ¥ 75,755,479 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 208,354 ¥ 7,060 ¥ — ¥ 215,414 Trading derivative liabilities 80,673 11,844,463 81,781 12,006,917 Interest rate contracts 3,085 8,659,042 12,496 8,674,623 Foreign exchange contracts 2,058 2,992,812 5,382 3,000,252 Equity contracts 75,530 117,572 33,679 226,781 Commodity contracts — 4,362 30,070 34,432 Credit derivatives — 70,675 154 70,829 Obligation to return securities received as collateral 3,030,974 145,988 — 3,176,962 Others (5) — 507,700 (25,528 ) 482,172 Total ¥ 3,320,001 ¥ 12,505,211 ¥ 56,253 ¥ 15,881,465 At September 30, 2018 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 11,165,761 ¥ 12,454,327 ¥ 776,404 ¥ 24,396,492 Debt securities Japanese national government and Japanese government agency bonds 2,395,839 428,697 — 2,824,536 Japanese prefectural and municipal bonds — 82,105 — 82,105 Foreign governments and official institutions bonds 7,096,467 472,704 1,135 7,570,306 Corporate bonds — 3,537,933 12,400 3,550,333 Residential mortgage-backed securities — 5,046,706 38,736 5,085,442 Asset-backed securities — 332,137 626,934 959,071 Other debt securities — 877 35,796 36,673 Commercial paper — 1,628,906 — 1,628,906 Equity securities (2) 1,673,455 924,262 61,403 2,659,120 Trading derivative assets 81,056 11,504,535 75,241 11,660,832 Interest rate contracts 13,761 7,776,462 16,998 7,807,221 Foreign exchange contracts 3,621 3,517,345 16,977 3,537,943 Equity contracts 63,674 143,420 12,256 219,350 Commodity contracts — 4,842 28,018 32,860 Credit derivatives — 62,466 992 63,458 Investment securities: Available-for-sale 21,343,577 9,520,671 298,262 31,162,510 Japanese national government and Japanese government agency bonds 19,682,038 3,149,851 — 22,831,889 Japanese prefectural and municipal bonds — 1,776,267 — 1,776,267 Foreign governments and official institutions bonds 1,661,539 516,971 18,945 2,197,455 Corporate bonds — 1,107,735 2,403 1,110,138 Residential mortgage-backed securities — 1,495,734 15 1,495,749 Commercial mortgage-backed securities — 104,327 2,293 106,620 Asset-backed securities — 1,365,717 130,616 1,496,333 Other debt securities — 4,069 143,990 148,059 Equity securities (6) 6,503,595 517,401 28,413 7,049,409 Marketable equity securities 6,503,595 517,401 — 7,020,996 Nonmarketable equity securities (7) — — 28,413 28,413 Others (3)(4) 923,764 49,712 18,022 991,498 Total ¥ 40,017,753 ¥ 34,046,646 ¥ 1,196,342 ¥ 75,260,741 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 28,947 ¥ 14,720 ¥ — ¥ 43,667 Trading derivative liabilities 130,816 11,589,654 61,842 11,782,312 Interest rate contracts 14,316 7,881,739 20,144 7,916,199 Foreign exchange contracts 2,060 3,489,349 4,415 3,495,824 Equity contracts 114,440 142,932 10,211 267,583 Commodity contracts — 3,858 26,947 30,805 Credit derivatives — 71,776 125 71,901 Obligation to return securities received as collateral 3,259,898 167,260 — 3,427,158 Others (5) — 486,579 5,005 491,584 Total ¥ 3,419,661 ¥ 12,258,213 ¥ 66,847 ¥ 15,744,721 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, 2018 were ¥21,517 million, and those at September 30, 2018 were ¥30,195 million, respectively. The amounts of unfunded commitments related to these private equity funds at March 31, 2018 were ¥61,463 million, and those at September 30, 2018 were ¥88,173 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, 2018. (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 private equity funds, whose fair values at March 31, 2018 was ¥35 million, and those at September 30, 2018 was ¥5 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, 2018. (5) Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments. (6) The table above reflects changes in presentation that were made to equity investment securities at March 31, 2018. See Note 1 for further information. (7) Excludes certain investments valued at net asset value of real estate funds whose fair values at September 30, 2018 were ¥14,578 million. The amounts of unfunded commitments related to these real estate funds at September 30, 2018 were ¥7,395 million. For the nature and details of real estate funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2018.
Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Level 3 Inputs [Table Text Block]	Total gains (losses) Change in 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) 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 — Equity securities 26,292 (648 ) (4) — 1,366 — (1,194 ) — — (252 ) 25,564 (1,280 ) (4) Nonmarketable equity securities 26,292 (648 ) — 1,366 — (1,194 ) — — (252 ) 25,564 (1,280 ) 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 ) Total gains (losses) Change in March 31, Included Included Purchases Issues Sales Settlements Transfers (5) Transfers (5) September 30, (in millions) Assets Trading account assets: Trading securities (1) ¥ 827,493 ¥ 42,948 (2) ¥ — ¥ 274,937 ¥ — ¥ (177,306 ) ¥ (181,133 ) ¥ 4,532 ¥ (15,067 ) ¥ 776,404 ¥ 40,167 (2) Debt securities Foreign governments and official institutions bonds 1,047 214 — 40,600 — (40,710 ) (16 ) — — 1,135 6 Corporate bonds 23,092 682 — 729 — (193 ) (1,375 ) 4,532 (6) (15,067 ) (6) 12,400 642 Residential mortgage-backed securities 41,141 667 — — — — (3,072 ) — — 38,736 636 Asset-backed securities 684,637 38,155 — 216,109 — (136,388 ) (175,579 ) — — 626,934 36,181 Other debt securities 33,450 2,346 — — — — — — — 35,796 2,346 Equity securities 44,126 884 — 17,499 — (15 ) (1,091 ) — — 61,403 356 Trading derivatives—net 12,119 3,739 (2) (545 ) 582 (429 ) — (34,413 ) 23,922 8,424 13,399 (7,391 ) (2) Interest rate contracts—net 14,596 2,127 (134 ) — (94 ) — (18,154 ) 311 (1,798 ) (3,146 ) 2,256 Foreign exchange contracts—net 6,736 (12,064 ) (262 ) 18 — — (2,614 ) 23,611 (6) (2,863 ) 12,562 (11,544 ) Equity contracts—net (10,685 ) 13,488 (153 ) — — — (13,690 ) — 13,085 (6) 2,045 964 Commodity contracts—net 683 156 4 564 (335 ) — (1 ) — — 1,071 900 Credit derivatives—net 789 32 — — — — 46 — — 867 33 Investment securities: Available-for-sale 350,660 6,323 (3) (9,056 ) 131,326 — — (181,004 ) 102 (89 ) 298,262 (83 ) (3) Foreign governments and official institutions bonds 20,192 — (1,002 ) 242 — — (487 ) — — 18,945 — Corporate bonds 6,037 4 (3 ) 1,670 — — (5,318 ) 102 (89 ) 2,403 (83 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed securities 2,430 — (104 ) — — — (33 ) — — 2,293 — Asset-backed securities 161,172 6,319 (2,806 ) 129,400 — — (163,469 ) — — 130,616 — Other debt securities 160,814 — (5,141 ) 14 — — (11,697 ) — — 143,990 — Equity securities 28,359 (1,199 ) (7) — 2,203 — (825 ) — — (125 ) 28,413 (1,602 ) (7) Nonmarketable equity securities 28,359 (1,199 ) — 2,203 — (825 ) — — (125 ) 28,413 (1,602 ) Others 8,660 966 (8) (22 ) 8,601 — (183 ) — — — 18,022 872 (8) Total ¥ 1,227,291 ¥ 52,777 ¥ (9,623 ) ¥ 417,649 ¥ (429 ) ¥ (178,314 ) ¥ (396,550 ) ¥ 28,556 ¥ (6,857 ) ¥ 1,134,500 ¥ 31,963 Liabilities Others ¥ (25,528 ) ¥ (5,160 ) (4) ¥ 2,262 ¥ — ¥ 848 ¥ — ¥ (11,902 ) ¥ 14,454 ¥ 24,235 ¥ 5,005 ¥ (1,049 ) (4) Total ¥ (25,528 ) ¥ (5,160 ) ¥ 2,262 ¥ — ¥ 848 ¥ — ¥ (11,902 ) ¥ 14,454 ¥ 24,235 ¥ 5,005 ¥ (1,049 ) Notes: (1 ) Includes Trading securities measured under the fair value option. (2 ) Included in Trading account profits (losses)—net and in Foreign exchange losses—net. (3 ) Included in Investment securities gains—net. (4 ) Included in Trading account profits (losses)—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 Level 3 for Foreign exchange contract were mainly caused by the valuation using certain unobservable input. Transfers into (out of) Level 3 for corporate bonds were mainly caused by the decrease (increase) in liquidity or the availability of the quoted prices provided by third-party venders and Equity contracts—net were mainly caused by the change of valuation model and the change cease using certain unobservable input. (7 ) Included in Investment securities gains—net. (8 ) Included in Other non-interest (9 ) The table above reflects changes in presentation that were made to equity investment securities at March 31, 2018. See Note 1 for further information.
Carrying Value of Assets Measured at Fair Value on Nonrecurring Basis by Level [Table Text Block]	March 31, 2018 September 30, 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Assets Investment securities (1)(2) ¥ — ¥ — ¥ 1,984 ¥ 1,984 ¥ — ¥ 9,619 ¥ 2,451 ¥ 12,070 Loans 3,458 8,329 239,653 251,440 3,575 10,385 228,659 242,619 Loans held for sale — — 22,835 22,835 — — 26,795 26,795 Collateral dependent loans 3,458 8,329 216,818 228,605 3,575 10,385 201,864 215,824 Premises and equipment — — 34,326 34,326 — — 13,600 13,600 Intangible assets — — 9,402 9,402 — — 416 416 Other assets 92,223 — 6,196 98,419 — 62,996 5,081 68,077 Investments in equity method investees (1) 92,223 — — 92,223 — 62,996 — 62,996 Other — — 6,196 6,196 — — 5,081 5,081 Total ¥ 95,681 ¥ 8,329 ¥ 291,561 ¥ 395,571 ¥ 3,575 ¥ 83,000 ¥ 250,207 ¥ 336,782 Notes: (1 ) Excludes certain investments valued at net asset value of ¥8,443 million and ¥7,296 million at March 31, 2018 and September 30, 2018, respectively. The unfunded commitments related to these investments are ¥1,544 million and ¥19 million at March 31, 2018 and September 30, 2018, 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, 2018. (2 ) Includes certain nonmarketable equity securities that are measured at fair value on a nonrecurring basis, including impairment and observable price change for nonmarketable equity securities measured under the measurement alternative.
Losses (Gains) Recorded as a Result of Changes in Fair Value Measured on a Nonrecurring Basis [Table Text Block]	Losses(gains) for the 2017 2018 (in millions) Investment securities ¥ 284 ¥ (8,013 ) Loans 25,781 23,727 Loans held for sale 249 3 Collateral dependent loans 25,532 23,724 Premises and equipment 6,227 3,552 Intangible assets 16,591 667 Other assets 28,395 10,696 Investments in equity method investees 27,985 10,034 Other 410 662 Total ¥ 77,278 ¥ 30,629
Gains (Losses) Related to Instruments for which Fair Value Option was Elected [Table Text Block]	Six months ended September 30, 2017 2018 Trading Foreign Total Trading Foreign Total (in millions) Financial assets: Trading account securities (1) ¥ 90,632 ¥ 460,947 ¥ 551,579 ¥ (157,359 ) ¥ 638,886 ¥ 481,527 Total ¥ 90,632 ¥ 460,947 ¥ 551,579 ¥ (157,359 ) ¥ 638,886 ¥ 481,527 Financial liabilities: Other short-term borrowings (2) ¥ 2,054 ¥ — ¥ 2,054 ¥ (1,446 ) ¥ — ¥ (1,446 ) Long-term debt (2) 1,172 — 1,172 (6,491 ) — (6,491 ) Total ¥ 3,226 ¥ — ¥ 3,226 ¥ (7,937 ) ¥ — ¥ (7,937 ) Notes: (1) Excludes Danamon’s equity securities. See Note 2 for reference. (2) 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, 2018 September 30, 2018 Remaining Fair value Fair value Remaining Fair value Fair value (in millions) Financial liabilities: Long-term debt ¥ 347,002 ¥ 333,985 ¥ (13,017 ) ¥ 378,216 ¥ 355,154 ¥ (23,062 ) Total ¥ 347,002 ¥ 333,985 ¥ (13,017 ) ¥ 378,216 ¥ 355,154 ¥ (23,062 )
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, 2018 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 32,648 ¥ 32,648 ¥ 32,648 ¥ — ¥ — Interest-earning deposits in other banks 43,210 43,210 — 43,210 — Call loans and funds sold 896 896 — 896 — Receivables under resale agreements 5,726 5,726 — 5,726 — Receivables under securities borrowing transactions 9,269 9,269 — 9,269 — Investment securities (1)(2) 3,684 3,797 1,197 1,051 1,549 Loans, net of allowance for credit losses (3) 116,272 117,753 3 330 117,420 Other financial assets (4) 7,000 7,000 — 7,000 — Financial liabilities: Deposits Non-interest-bearing ¥ 29,862 ¥ 29,862 ¥ — ¥ 29,862 ¥ — Interest-bearing 165,831 165,825 — 165,825 — Total deposits 195,693 195,687 — 195,687 — Call money and funds purchased 2,453 2,453 — 2,453 — Payables under repurchase agreements 18,135 18,135 — 18,135 — Payables under securities lending transactions 8,170 8,170 — 8,170 — Due to trust account 3,386 3,386 — 3,386 — Other short-term borrowings 6,617 6,617 — 6,617 — Long-term debt 26,861 26,919 — 26,919 — Other financial liabilities 6,642 6,642 — 6,642 — At September 30, 2018 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 35,664 ¥ 35,664 ¥ 35,664 ¥ — ¥ — Interest-earning deposits in other banks 39,157 39,157 — 39,157 — Call loans and funds sold 877 877 — 877 — Receivables under resale agreements 11,266 11,266 — 11,266 — Receivables under securities borrowing transactions 3,113 3,113 — 3,113 — Investment securities 4,188 4,198 1,189 1,131 1,878 Loans, net of allowance for credit losses (3) 117,029 117,598 4 284 117,310 Other financial assets (4) 6,954 6,954 — 6,954 — Financial liabilities: Deposits Non-interest-bearing ¥ 29,649 ¥ 29,649 ¥ — ¥ 29,649 ¥ — Interest-bearing 163,249 163,248 — 163,248 — Total deposits 192,898 192,897 — 192,897 — Call money and funds purchased 2,344 2,344 — 2,344 — Payables under repurchase agreements 25,604 25,604 — 25,604 — Payables under securities lending transactions 1,900 1,900 — 1,900 — Due to trust account 3,029 3,029 — 3,029 — Other short-term borrowings 6,923 6,923 — 6,923 — Long-term debt 27,622 27,589 — 27,589 — Other financial liabilities 6,961 6,961 — 6,961 — Notes: (1) Includes impaired securities measured at fair value on a nonrecurring basis at March 31, 2018. 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 ¥437 billion at March 31, 2018, 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 ¥2,219 billion and ¥2,542 billion at March 31, 2018 and September 30, 2018, respectively.
Fair Value, Measurements, Recurring [Member]
Transfers between Level 1 and Level 2 [Table Text Block]	Six months ended September 30, 2017 2018 Transfers out of (1) Transfers out of (1) Transfers out of (1) Transfers out of (1) (in millions) Assets Investment securities: Equity securities Marketable equity securities ¥ 1,981 ¥ 3,839 ¥ 7,261 ¥ 8,122 Note: (1) All transfers between Level 1 and Level 2 were assumed to have occurred at the beginning of the period.
Quantitative Information about Level 3 Fair Value Measurements [Table Text Block]	At March 31, 2018 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign governments and official institutions ¥ 20,192 Return on equity method Probability of default 0.0%~0.4% 0.2 % Recovery rate 60.0%~70.0% 66.7 % Market-required return on capital 8.0%~10.0% 9.5 % Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 110,536 Discounted cash flow Probability of default 1.2%~5.3% 4.5 % Recovery rate 60.0%~76.0% 66.3 % 684,586 Internal model (4) Asset correlations 9.0% 9.0 % Discount factor 1.0% 1.0 % Prepayment rate 37.2% 37.2 % Probability of default 0.0%~91.3% — (3) Recovery rate 65.3% 65.3 % Other debt securities 33,450 Discounted cash flow Liquidity premium 0.5%~2.4% 0.8 % 149,759 Return on equity method Probability of default 0.0%~25.0% 0.3 % Recovery rate 40.0%~90.0% 72.5 % Market-required return on capital 8.0%~10.0% 9.7 % At March 31, 2018 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net 14,460 Option model Probability of default 0.0%~12.5% Correlation between interest rates 34.1%~52.7% Correlation between interest rate and foreign exchange rate 19.7%~50.4% Recovery rate 41.0%~46.0% Volatility 13.4%~100.0% Probability of prepayment 100.0% Foreign exchange contracts—net 6,779 Option model Probability of default 0.0%~12.5% Correlation between interest rates 40.3%~74.0% Correlation between interest rate and foreign exchange rate 28.1%~50.7% Recovery rate 41.0%~46.0% Correlation between underlying assets 85.0% Volatility 10.3%~16.2% Equity contracts—net (16,600 ) Option model Correlation between interest rate and equity 37.1%~39.0% Correlation between foreign exchange rate and equity 7.0%~65.2% Correlation between equities 20.6%~81.7% Correlation between underlying assets 76.0% 6,528 Discounted cash flow Term of litigation 2.0years At September 30, 2018 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 ¥ 18,945 Return on equity method Probability of default 0.0%~0.4% 0.3 % Recovery rate 60.0%~70.0% 66.6 % Market-required return on capital 10.0% 10.0 % Residential mortgage- backed securities, Commercial mortgage- backed securities and Asset-backed securities 79,186 Discounted cash flow Probability of default 1.2%~5.3% 5.0 % Recovery rate 60.0%~76.0% 66.9 % 626,934 Internal model (4) Asset correlations 9.0% 9.0 % Discount factor 1.0% 1.0 % Prepayment rate 28.0% 28.0 % Probability of default 0.0%~88.1% — (3) Recovery rate 67.6% 67.6 % Other debt securities 35,796 Discounted cash flow Liquidity premium 1.0%~2.4% 1.3 % 135,688 Return on equity method Probability of default 0.0%~25.0% 0.3 % Recovery rate 40.0%~90.0% 74.9 % Market-required return on capital 8.0%~10.0% 9.5 % At September 30, 2018 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net (3,283 ) Option model Probability of default 0.0%~11.9% Correlation between interest rates 31.4%~50.1% Correlation between interest rate and foreign exchange rate 23.0%~53.8% Recovery rate 41.0%~47.0% Volatility 13.6%~70.4% Probability of prepayment 100.0% Foreign exchange contracts—net 12,580 Option model Probability of default 0.0%~7.6% Correlation between interest rates 45.0%~74.0% Correlation between interest rate and foreign exchange rate 16.3%~53.8% Recovery rate 41.0%~47.0% Correlation between underlying assets 85.0% Volatility 11.2%~17.2% Equity contracts—net (3,767 ) Option model Correlation between interest rate and equity 41.6% Correlation between foreign exchange rate and equity 7.0%~65.4% Correlation between equities 24.3%~85.9% Correlation between underlying assets 76.0%~80.0% 6,410 Discounted cash flow Term of litigation 1.5 years Notes: (1 ) The fair value as of March 31, 2018 and September 30, 2018 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, 2018. (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, 2018.

Investments in Equity Method _2

Investments in Equity Method Investees [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2018
Morgan Stanley [Member]
Summarized Operating Results of Morgan Stanley [Table Text Block]	2017 2018 (in billions) Net revenues ¥ 2,077 ¥ 2,258 Total non-interest 1,508 1,601 Income from continuing operations before income taxes 569 657 Net income applicable to Morgan Stanley 393 502

Basis of Semiannual Condensed_3

Basis of Semiannual Condensed Consolidated Financial Statements (Narrative) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Apr. 01, 2018
Accounting Changes:
Increase in Net cash used in operating activities	¥ (725,956)	¥ (1,676,824)	[1]
Increase in Net cash provided by investing activities	¥ 2,262,185	4,085,441	[1]
Restricted Cash [Member]
Accounting Changes:
Increase in Net cash used in operating activities		3,049
Increase in Net cash provided by investing activities		¥ 727,688
Retained Earnings Appropriated for Legal Reserve [Member] | Recognition and Measurement of Financial Assets and Financial Liabilities [Member]
Accounting Changes:
Cumulative effect of change on Equity				¥ 2,702,000
Retained Earnings Appropriated for Legal Reserve [Member] | Recognition of Breakage for Certain Prepaid Stored-Value Products [Member]
Accounting Changes:
Cumulative effect of change on Equity				1,784
Accumulated Other Comprehensive Income, Net of Taxes [Member] | Recognition and Measurement of Financial Assets and Financial Liabilities [Member]
Accounting Changes:
Cumulative effect of change on Equity				¥ (2,702,000)
[1]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.

Business Developments (Narrativ

Business Developments (Narrative) (Detail) ¥ / shares in Units, Rp / shares in Units, ¥ in Millions, Rp in Billions

Aug. 03, 2018JPY (¥)¥ / shares

Aug. 03, 2018IDR (Rp)

Dec. 29, 2017JPY (¥)¥ / shares

Dec. 29, 2017IDR (Rp)

Oct. 02, 2017JPY (¥)

Sep. 30, 2018JPY (¥)Offices

Sep. 30, 2017JPY (¥)

Aug. 03, 2018Rp / shares

Mar. 31, 2018JPY (¥)

Dec. 29, 2017Rp / shares

Dec. 26, 2017

May 15, 2017JPY (¥)

Business Developments [Line Items]

Liability recognized in Other liabilities

¥ 7,718,464

¥ 7,407,413

Settlement of Other Liabilities

[1]

¥ (50,000)

Reduction in Noncontrolling interests

(663,506)

(675,633)

Reduction in Capital surplus

(5,685,427)

(5,740,165)

Increase in Accumulated other comprehensive income, net of taxes

¥ (272,240)

¥ 2,514,742

¥ 2,477,315

Mitsubishi UFJ NICOS becomes a Wholly-Owned Subsidiary of MUFG [Member]

Business Developments [Line Items]

Ownership acquired, in percentage

15.02%

Business acquisition in cash

¥ 50,000

Liability recognized in Other liabilities

¥ 50,000

Settlement of 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

MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member]

Business Developments [Line Items]

Number of offices in Indonesia | Offices

1,800

Description of strategic investment

Will be executed through three steps (the “Proposed Transaction”), and the completion of the Proposed Transaction will result in MUFG Bank becoming the largest shareholder in Danamon and Danamon becoming a consolidated subsidiary of MUFG Bank.

Additional equity interests acquired, in percentage

20.10%

20.10%

Equity interest after acquisition, in aggregated percentage

40.00%

40.00%

19.90%

19.90%

Price per share paid | (per share)

¥ 69

[2]

¥ 70

[3]

Rp 8,921

Rp 8,323

Investment amount paid

¥ 132,300

[2]

Rp 17,187

¥ 133,000

[3]

Rp 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 June 30, 2018 with certain adjustments applied.

A price book-value ratio of 2.0 calculated on the basis of Danamon's net assets as of June 30, 2018 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.

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

2

2

Exchange rate of IDR

0.0077

0.0084

0.0077

0.0084

MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member] | Minimum [Member]

Business Developments [Line Items]

Final equity interest expected upon the completion of proposed transactions

73.80%

[1]

The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.

[2]

Calculated based on the exchange rate of IDR1 = ¥0.0077

[3]

Calculated based on the exchange rate of IDR1 = ¥0.0084

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018	Mar. 31, 2017
Investment Securities [Line Items]
Gross realized gains on sales of Available-for-sale debt securities and marketable equity securities		¥ 189,782
Gross realized losses on sales of Available-for-sale debt securities and marketable equity securities		14,041
Gross realized gains on sales of Available-for-sale debt securities	¥ 23,746
Gross realized losses on sales of Available-for-sale debt securities	9,495
Other-than-temporary impairment ("OTTI") losses of investment securities included in Investment securities gains-net		6,428
Other-than-temporary impairment ("OTTI") losses of debt securities included in Investment securities gains-net	85
Other-than-temporary impairment ("OTTI") losses of investment securities	81	95
Equity securities			¥ 2,789,392
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
Length of time the fair value of the investment has been below cost	6 months
Threshold percentage of decline in fair value below cost as an indicator of other-than-temporary impairment ("OTTI")	20.00%
Equity securities			2,789,392
Corporate Bonds [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities included in Investment securities gains-net		108
Other-than-temporary impairment ("OTTI") losses of debt securities included in Investment securities gains-net	¥ 85
Cumulative declines in fair value of the credit impaired debt securities	1,826	3,200
Credit loss components of impairment losses recognized in earnings	3,350	3,830	3,498	¥ 4,125
Other factors of impairment losses recognized in Accumulated OCI before taxes	¥ 1,524	630
Nonmarketable Equity Securities [Member]
Investment Securities [Line Items]
Aggregate costs of cost-method investments, not estimated at the fair value			437,486
Other-than-temporary impairment ("OTTI") losses recognized on cost-method investments		¥ 284
Nonmarketable Equity Securities [Member] | Fair Value Estimated by Commonly Accepted Valuation Techniques [Member]
Investment Securities [Line Items]
Cost-method investments			97,586
Nonmarketable Equity Securities [Member] | Test Performed to Determine Existence of Any Impairment Indicators [Member]
Investment Securities [Line Items]
Cost-method investments			440,665
Nonmarketable Equity Securities [Member] | Carried at Cost [Member]
Investment Securities [Line Items]
Equity securities			538,251
Nonmarketable Equity Securities [Member] | Estimated Fair Value [Member]
Investment Securities [Line Items]
Equity securities			¥ 28,359

Investment Securities (Amortize

Investment Securities (Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Investment Securities) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended		12 Months Ended
	Sep. 30, 2018		Mar. 31, 2018
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	¥ 30,994,346		¥ 32,556,669
Available-for-sale debt securities, Gross unrealized gains	281,779		349,372
Available-for-sale debt securities, Gross unrealized losses	113,615		72,927
Available-for-sale debt securities, Fair value	31,162,510		32,833,114
Held-to-maturity debt securities, Amortized cost	4,187,966		3,582,941
Held-to-maturity debt securities, Gross unrealized gains	45,387		54,800
Held-to-maturity debt securities, Gross unrealized losses	34,861		17,069
Held-to-maturity debt securities, Fair value	4,198,492		3,620,672
Equity securities, Amortized cost			2,789,392
Equity securities, Gross unrealized gains			3,925,680
Equity securities, Gross unrealized losses			43,488
Equity securities, Fair value			6,671,584
Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	22,605,246		24,272,345
Available-for-sale debt securities, Gross unrealized gains	241,338		299,402
Available-for-sale debt securities, Gross unrealized losses	14,695		3,843
Available-for-sale debt securities, Fair value	22,831,889		24,567,904
Held-to-maturity debt securities, Amortized cost	1,100,765		1,100,807
Held-to-maturity debt securities, Gross unrealized gains	33,485		40,212
Held-to-maturity debt securities, Gross unrealized losses
Held-to-maturity debt securities, Fair value	1,134,250		1,141,019
Japanese Prefectural and Municipal Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,777,026		1,532,143
Available-for-sale debt securities, Gross unrealized gains	5,325		7,808
Available-for-sale debt securities, Gross unrealized losses	6,084		2,520
Available-for-sale debt securities, Fair value	1,776,267		1,537,431
Foreign Governments and Official Institutions Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	2,248,125		2,207,662
Available-for-sale debt securities, Gross unrealized gains	7,063		8,938
Available-for-sale debt securities, Gross unrealized losses	57,733		44,908
Available-for-sale debt securities, Fair value	2,197,455		2,171,692
Held-to-maturity debt securities, Amortized cost	58,209		59,330
Held-to-maturity debt securities, Gross unrealized gains	246		383
Held-to-maturity debt securities, Gross unrealized losses	336		103
Held-to-maturity debt securities, Fair value	58,119		59,610
Corporate Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,097,050		1,104,799
Available-for-sale debt securities, Gross unrealized gains	14,159		15,589
Available-for-sale debt securities, Gross unrealized losses	1,071		1,028
Available-for-sale debt securities, Fair value	1,110,138		1,119,360
Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,521,850		1,632,346
Available-for-sale debt securities, Gross unrealized gains	496		752
Available-for-sale debt securities, Gross unrealized losses	26,597		15,563
Available-for-sale debt securities, Fair value	1,495,749		1,617,535
Held-to-maturity debt securities, Amortized cost	991,682		885,965
Held-to-maturity debt securities, Gross unrealized gains	701		1,660
Held-to-maturity debt securities, Gross unrealized losses	29,568	[1]	14,726	[2]
Held-to-maturity debt securities, Fair value	962,815		872,899
Residential Mortgage-backed Securities [Member] | MUAH [Member]
Investment Securities [Line Items]
Unrealized losses before taxes at the date of reclassification from Available-for-sale debt securities to Held-to-maturity debt securities remaining in Accumulated OCI	11,697		3,457
Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	109,708		95,383
Available-for-sale debt securities, Gross unrealized gains	48		473
Available-for-sale debt securities, Gross unrealized losses	3,136		620
Available-for-sale debt securities, Fair value	106,620		95,236
Held-to-maturity debt securities, Amortized cost	165,786		171,647
Held-to-maturity debt securities, Gross unrealized gains	1,321		4,107
Held-to-maturity debt securities, Gross unrealized losses	2,001	[1]	1,018	[2]
Held-to-maturity debt securities, Fair value	165,106		174,736
Commercial Mortgage-backed Securities [Member] | MUAH [Member]
Investment Securities [Line Items]
Unrealized losses before taxes at the date of reclassification from Available-for-sale debt securities to Held-to-maturity debt securities remaining in Accumulated OCI	5,275		5,932
Asset-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,486,367		1,546,989
Available-for-sale debt securities, Gross unrealized gains	10,317		12,775
Available-for-sale debt securities, Gross unrealized losses	351		1,415
Available-for-sale debt securities, Fair value	1,496,333		1,558,349
Held-to-maturity debt securities, Amortized cost	1,871,524		1,365,192
Held-to-maturity debt securities, Gross unrealized gains	9,634		8,438
Held-to-maturity debt securities, Gross unrealized losses	2,956		1,222
Held-to-maturity debt securities, Fair value	1,878,202		1,372,408
Other Debt Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	148,974	[3]	165,002	[4]
Available-for-sale debt securities, Gross unrealized gains	3,033	[3]	3,635	[4]
Available-for-sale debt securities, Gross unrealized losses	3,948	[3]	3,030	[4]
Available-for-sale debt securities, Fair value	148,059	[3]	165,607	[4]
Other Debt Securities [Member] | Private Placement Debt Conduit Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value	¥ 135,688		152,374
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Equity securities, Amortized cost			2,789,392
Equity securities, Gross unrealized gains			3,925,680
Equity securities, Gross unrealized losses			43,488
Equity securities, Fair value			¥ 6,671,584
[1]	MUFG Americas Holdings reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale debt securities to Held-to-maturity debt securities. 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 ¥11,697 million and ¥5,275 million, respectively, at September 30, 2018 and are not included in the table above.
[2]	MUFG Americas Holdings Corporation ("MUFG Americas Holdings" or "MUAH") reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale debt securities to Held-to-maturity debt 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 ¥3,457 million and ¥5,932 million, respectively, at March 31, 2018 and are not included in the table above.
[3]	Other debt securities in the table above include ¥135,688 million of private placement debt conduit bonds.
[4]	Other debt securities in the table above include ¥152,374 million of private placement debt conduit bonds.

Investment Securities (Amorti_2

Investment Securities (Amortized Cost and Fair Value by Contractual Maturity) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2018	Mar. 31, 2018
Held-to-maturity debt securities, Amortized cost:
Due in one year or less	¥ 33,162
Due from one year to five years	173,953
Due from five years to ten years	1,561,712
Due after ten years	2,419,139
Held-to-maturity debt securities, Amortized cost	4,187,966	¥ 3,582,941
Held-to-maturity debt securities, Fair value:
Due in one year or less	33,051
Due from one year to five years	174,740
Due from five years to ten years	1,592,472
Due after ten years	2,398,229
Held-to-maturity debt securities, Fair value	4,198,492	3,620,672
Available-for-sale debt securities, Fair value:
Due in one year or less	9,096,329
Due from one year to five years	12,133,838
Due from five years to ten years	5,787,030
Due after ten years	4,145,313
Available-for-sale debt securities, Fair value	¥ 31,162,510	¥ 32,833,114

Investment Securities (Investme

Investment Securities (Investments by Length and Category in Continuous Loss Position) (Detail) ¥ in Millions	Sep. 30, 2018JPY (¥)Securities	Mar. 31, 2018JPY (¥)Securities
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 12,578,825	¥ 6,974,266
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	44,469	25,765
Available-for-sale debt securities, Fair value, 12 months or more	2,272,756	2,127,515
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	69,146	47,162
Available-for-sale debt securities, Fair value, Total	14,851,581	9,101,781
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 113,615	¥ 72,927
Available-for-sale debt securities, Number of securities | Securities	1,584	1,255
Held-to-maturity debt securities, Fair value, Less than 12 months	¥ 1,071,302	¥ 633,087
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months	12,173	4,814
Held-to-maturity debt securities, Fair value, 12 months or more	677,912	621,033
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more	22,688	12,255
Held-to-maturity debt securities, Fair value, Total	1,749,214	1,254,120
Held-to-maturity debt securities, Gross unrealized losses, Total	¥ 34,861	¥ 17,069
Held-to-maturity debt securities, Number of securities | Securities	529	385
Equity securities, Fair value, Less than 12 months		¥ 448,489
Equity securities, Gross unrealized losses, Less than 12 months		43,482
Equity securities, Fair value, 12 months or more		28
Equity securities, Gross unrealized losses, 12 months or more		6
Equity securities, Fair value, Total		448,517
Equity securities, Gross unrealized losses, Total		¥ 43,488
Equity securities, Number of securities | Securities		116
Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 9,844,320	¥ 4,767,893
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	12,969	2,701
Available-for-sale debt securities, Fair value, 12 months or more	215,149	187,000
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	1,726	1,142
Available-for-sale debt securities, Fair value, Total	10,059,469	4,954,893
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 14,695	¥ 3,843
Available-for-sale debt securities, Number of securities | Securities	247	140
Japanese Prefectural and Municipal Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 965,127	¥ 400,705
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	2,736	453
Available-for-sale debt securities, Fair value, 12 months or more	401,458	353,047
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	3,348	2,067
Available-for-sale debt securities, Fair value, Total	1,366,585	753,752
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 6,084	¥ 2,520
Available-for-sale debt securities, Number of securities | Securities	344	193
Foreign Governments and Official Institutions Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 719,858	¥ 846,818
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	14,786	16,955
Available-for-sale debt securities, Fair value, 12 months or more	956,427	818,937
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	42,947	27,953
Available-for-sale debt securities, Fair value, Total	1,676,285	1,665,755
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 57,733	¥ 44,908
Available-for-sale debt securities, Number of securities | Securities	157	157
Held-to-maturity debt securities, Fair value, Less than 12 months	¥ 54,557	¥ 55,837
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months	336	103
Held-to-maturity debt securities, Fair value, 12 months or more
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more
Held-to-maturity debt securities, Fair value, Total	54,557	55,837
Held-to-maturity debt securities, Gross unrealized losses, Total	¥ 336	¥ 103
Held-to-maturity debt securities, Number of securities | Securities	10	10
Corporate Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 263,849	¥ 312,993
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	801	856
Available-for-sale debt securities, Fair value, 12 months or more	178,709	74,717
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	270	172
Available-for-sale debt securities, Fair value, Total	442,558	387,710
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 1,071	¥ 1,028
Available-for-sale debt securities, Number of securities | Securities	147	150
Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 491,920	¥ 438,545
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	9,216	2,644
Available-for-sale debt securities, Fair value, 12 months or more	466,314	623,285
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	17,381	12,919
Available-for-sale debt securities, Fair value, Total	958,234	1,061,830
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 26,597	¥ 15,563
Available-for-sale debt securities, Number of securities | Securities	522	503
Held-to-maturity debt securities, Fair value, Less than 12 months	¥ 424,594	¥ 299,286
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months	8,768	3,487
Held-to-maturity debt securities, Fair value, 12 months or more	518,017	451,968
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more	20,800	11,239
Held-to-maturity debt securities, Fair value, Total	942,611	751,254
Held-to-maturity debt securities, Gross unrealized losses, Total	¥ 29,568	¥ 14,726
Held-to-maturity debt securities, Number of securities | Securities	463	332
Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 90,747	¥ 50,898
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	2,542	386
Available-for-sale debt securities, Fair value, 12 months or more	10,959	9,067
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	594	234
Available-for-sale debt securities, Fair value, Total	101,706	59,965
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 3,136	¥ 620
Available-for-sale debt securities, Number of securities | Securities	106	60
Held-to-maturity debt securities, Fair value, Less than 12 months	¥ 5,211	¥ 2,150
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months	113	2
Held-to-maturity debt securities, Fair value, 12 months or more	159,895	169,065
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more	1,888	1,016
Held-to-maturity debt securities, Fair value, Total	165,106	171,215
Held-to-maturity debt securities, Gross unrealized losses, Total	¥ 2,001	¥ 1,018
Held-to-maturity debt securities, Number of securities | Securities	33	32
Asset-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 167,342	¥ 144,073
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	350	1,403
Available-for-sale debt securities, Fair value, 12 months or more	969	5,345
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	1	12
Available-for-sale debt securities, Fair value, Total	168,311	149,418
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 351	¥ 1,415
Available-for-sale debt securities, Number of securities | Securities	36	29
Held-to-maturity debt securities, Fair value, Less than 12 months	¥ 586,940	¥ 275,814
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months	2,956	1,222
Held-to-maturity debt securities, Fair value, 12 months or more
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more
Held-to-maturity debt securities, Fair value, Total	586,940	275,814
Held-to-maturity debt securities, Gross unrealized losses, Total	¥ 2,956	¥ 1,222
Held-to-maturity debt securities, Number of securities | Securities	23	11
Other Debt Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 35,662	¥ 12,341
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	1,069	367
Available-for-sale debt securities, Fair value, 12 months or more	42,771	56,117
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	2,879	2,663
Available-for-sale debt securities, Fair value, Total	78,433	68,458
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 3,948	¥ 3,030
Available-for-sale debt securities, Number of securities | Securities	25	23
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Equity securities, Fair value, Less than 12 months		¥ 448,489
Equity securities, Gross unrealized losses, Less than 12 months		43,482
Equity securities, Fair value, 12 months or more		28
Equity securities, Gross unrealized losses, 12 months or more		6
Equity securities, Fair value, Total		448,517
Equity securities, Gross unrealized losses, Total		¥ 43,488
Equity securities, Number of securities | Securities		116

Investment Securities (Roll-for

Investment Securities (Roll-forward of Credit Loss Component Recognized in Earnings) (Detail) - Corporate Bonds [Member] - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Roll-forward of credit loss component recognized in earnings:
Balance at beginning of period	¥ 3,498	¥ 4,125
Additions: Initial credit impairments	34	107
Additions: Subsequent credit impairments	51	1
Reductions: Securities sold or matured	(233)	(403)
Balance at end of period	¥ 3,350	¥ 3,830

Investment Securities (Net Real

Investment Securities (Net Realized Gains (Losses) on Sales of Equity Securities and Net Unrealized Gains (Losses) on Equity Securities still held) (Detail) ¥ in Millions	6 Months Ended
	Sep. 30, 2018JPY (¥)
Investments, Debt and Equity Securities [Abstract]
Net gains recognized during the period	¥ 411,720	[1]
Net gains recognized during the period on equity securities sold during the period	12,470
Net unrealized gains recognized during the reporting period still held at the reporting date	¥ 399,250
[1]	Included in Investment securities gains-net.

Investment Securities (Measurem

Investment Securities (Measurement Alternative of Equity Securities) (Detail) - Nonmarketable Equity Securities [Member] - Measurement Alternative [Member] ¥ in Millions	Sep. 30, 2018JPY (¥)
Investment Securities [Line Items]
Balance at September 30, 2018	¥ 541,961
Impairment losses	(479)	[1]
Downward changes for observable prices		[1],[2]
Upward changes for observable prices	¥ 8,492	[1],[2]
[1]	Included in Investment securities gains-net.
[2]	Under the measurement alternative, nonmarketable equity securities are carried at cost plus or minus changes resulting from observable prices in orderly transactions for the identical or a similar investment of the same issuer.

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses (Narrative) (Detail) - JPY (¥) ¥ in Billions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Significant sales of loans	¥ 590	¥ 580
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 Credi_4

Loans and Allowance for Credit Losses (Loans by Domicile and Industry of Borrower Segment Classification) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Unearned income, unamortized premiums-net and deferred loan fees-net		¥ (295,279)	¥ (294,656)
Total Loans, net	[1]	117,663,232	117,035,895
Loans held for sale		238,564	226,923
Domestic [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		64,927,131	65,696,342
Domestic [Member] | Manufacturing [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		10,717,304	10,876,625
Domestic [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		698,783	781,262
Domestic [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		11,746,501	11,763,769
Domestic [Member] | Services [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		2,576,921	2,689,086
Domestic [Member] | Wholesale and Retail [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		7,837,551	7,989,080
Domestic [Member] | Banks and Other Financial Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	[2]	4,892,078	4,818,364
Domestic [Member] | Communication and Information Services [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		1,550,557	1,551,533
Domestic [Member] | Other Industries [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		8,943,344	8,939,291
Domestic [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		15,964,092	16,287,332
Foreign [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		53,031,380	51,634,209
Foreign [Member] | Governments and Official Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		836,116	920,538
Foreign [Member] | Banks and Other Financial Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	[2]	13,029,862	12,851,570
Foreign [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		31,936,891	30,591,173
Foreign [Member] | Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		¥ 7,228,511	¥ 7,270,928
[1]	The above table includes loans held for sale of ¥226,923 million at March 31, 2018 and ¥238,564 million at September 30, 2018, 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 Credi_5

Loans and Allowance for Credit Losses (Nonaccrual Status of Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	¥ 684,513	¥ 746,929
Loans held for sale placed on nonaccrual status		3,969	61
Loans acquired with deteriorated credit quality placed on nonaccrual status		5,899	6,659
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		307,725	332,994
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		70,201	77,163
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		9,675	10,791
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		26,098	33,317
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		29,222	30,717
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		101,210	108,175
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		1,654	1,145
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		13,151	13,815
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		40,314	37,549
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		16,200	20,322
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		93,786	109,516
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		68,732	69,464
Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		61,694	61,387
MUAH [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		39,248	52,282
Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		¥ 113,328	¥ 121,286
[1]	The above table does not include loans held for sale of ¥61 million and ¥3,969 million at March 31, 2018 and September 30, 2018, respectively, and loans acquired with deteriorated credit quality of ¥6,659 million and ¥5,899 million, at March 31, 2018 and September 30, 2018, respectively.

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses (Impaired Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018		Mar. 31, 2018	Sep. 30, 2017	[4]	Mar. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	[1]	¥ 977,250		¥ 1,036,026
Recorded loan balance, Not requiring an allowance for credit losses	[1],[2]	277,506		295,097
Recorded loan balance, Total	[1],[3]	1,254,756		1,331,123
Unpaid principal balance	[1]	1,394,377		1,476,922
Related allowance for credit losses	[1]	386,709		494,326
Accrual TDRs included in impaired loans		653,772	[4]	670,255	¥ 711,238		¥ 819,819
Impaired loans held for sales		1,946		61
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Accrual TDRs included in impaired loans		525,746		536,748
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		7,621		7,837
Recorded loan balance, Total	[3]	7,621		7,837
Unpaid principal balance		14,920		15,470
Related allowance for credit losses		5,679		4,324
Commercial [Member] | Domestic [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		585,995		626,469
Recorded loan balance, Not requiring an allowance for credit losses	[2]	191,468		188,984
Recorded loan balance, Total	[3]	777,463		815,453
Unpaid principal balance		834,391		875,795
Related allowance for credit losses		240,718		331,851
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		351,225		361,268
Recorded loan balance, Not requiring an allowance for credit losses	[2]	36,331		36,566
Recorded loan balance, Total	[3]	387,556		397,834
Unpaid principal balance		397,682		408,124
Related allowance for credit losses		88,726		166,098
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		8,117		10,936
Recorded loan balance, Not requiring an allowance for credit losses	[2]	6,563		7,172
Recorded loan balance, Total	[3]	14,680		18,108
Unpaid principal balance		15,238		18,490
Related allowance for credit losses		6,355		7,921
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		24,030		43,553
Recorded loan balance, Not requiring an allowance for credit losses	[2]	32,229		23,053
Recorded loan balance, Total	[3]	56,259		66,606
Unpaid principal balance		61,461		71,809
Related allowance for credit losses		7,386		10,665
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		33,550		38,097
Recorded loan balance, Not requiring an allowance for credit losses	[2]	15,285		16,600
Recorded loan balance, Total	[3]	48,835		54,697
Unpaid principal balance		52,350		59,335
Related allowance for credit losses		23,329		25,890
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		126,183		128,661
Recorded loan balance, Not requiring an allowance for credit losses	[2]	46,559		49,628
Recorded loan balance, Total	[3]	172,742		178,289
Unpaid principal balance		183,688		189,404
Related allowance for credit losses		89,851		94,832
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		1,771		1,125
Recorded loan balance, Not requiring an allowance for credit losses	[2]	25		26
Recorded loan balance, Total	[3]	1,796		1,151
Unpaid principal balance		1,796		1,151
Related allowance for credit losses		1,583		972
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		17,373		18,782
Recorded loan balance, Not requiring an allowance for credit losses	[2]	7,701		7,852
Recorded loan balance, Total	[3]	25,074		26,634
Unpaid principal balance		26,641		28,082
Related allowance for credit losses		15,141		16,041
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		13,004		12,978
Recorded loan balance, Not requiring an allowance for credit losses	[2]	35,894		34,282
Recorded loan balance, Total	[3]	48,898		47,260
Unpaid principal balance		67,095		67,525
Related allowance for credit losses		5,376		5,350
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		10,742		11,069
Recorded loan balance, Not requiring an allowance for credit losses	[2]	10,881		13,805
Recorded loan balance, Total	[3]	21,623		24,874
Unpaid principal balance		28,440		31,875
Related allowance for credit losses		2,971		4,082
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		124,631		122,243
Recorded loan balance, Not requiring an allowance for credit losses	[2]	23,959		40,249
Recorded loan balance, Total	[3]	148,590		162,492
Unpaid principal balance		169,822		190,518
Related allowance for credit losses		69,774		82,855
Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		99,610		105,089
Recorded loan balance, Not requiring an allowance for credit losses	[2]	6,865		6,261
Recorded loan balance, Total	[3]	106,475		111,350
Unpaid principal balance		128,263		134,777
Related allowance for credit losses		14,488		16,928
Accrual TDRs included in impaired loans		36,915		40,734
Card [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		65,783		66,964
Recorded loan balance, Not requiring an allowance for credit losses	[2]	391		388
Recorded loan balance, Total	[3]	66,174		67,352
Unpaid principal balance		73,590		74,840
Related allowance for credit losses		21,686		21,223
Accrual TDRs included in impaired loans		27,377		28,541
MUAH [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		39,445		48,895
Recorded loan balance, Not requiring an allowance for credit losses	[2]	28,533		33,650
Recorded loan balance, Total	[3]	67,978		82,545
Unpaid principal balance		85,520		94,565
Related allowance for credit losses		6,464		7,743
Accrual TDRs included in impaired loans		37,281		39,333
Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		54,165		58,529
Recorded loan balance, Not requiring an allowance for credit losses	[2]	26,290		25,565
Recorded loan balance, Total	[3]	80,455		84,094
Unpaid principal balance		87,871		90,957
Related allowance for credit losses		27,900		29,402
Accrual TDRs included in impaired loans		¥ 26,453		¥ 24,899
[1]	In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥61 million and ¥1,946 million at March 31, 2018 and September 30, 2018, 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' original 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, 2018 and September 30, 2018 are accrual TDRs as follows: ¥536,748 million and ¥525,746 million-Commercial; ¥40,734 million and ¥36,915 million-Residential; ¥28,541 million and ¥27,377 million-Card; ¥39,333 million and ¥37,281 million-MUFG Americas Holdings; and ¥24,899 million and ¥26,453 million-Krungsri, respectively.
[4]	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. For the six months ended September 30, 2018, lease receivables of ¥538 million and ¥50 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 ¥3,642 million and ¥1,135 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2018.

Loans and Allowance for Credi_7

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, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	¥ 1,283,207	¥ 1,527,040
Recognized interest income	12,946	13,550
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	7,648	8,817
Recognized interest income	194	563
Commercial [Member] | Domestic [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	796,431	952,510
Recognized interest income	5,846	4,830
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	392,695	509,211
Recognized interest income	2,787	1,812
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	16,393	20,112
Recognized interest income	162	144
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	61,434	77,940
Recognized interest income	544	574
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	51,767	62,750
Recognized interest income	420	381
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	175,516	190,328
Recognized interest income	1,385	1,109
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	1,474	2,030
Recognized interest income	4	7
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	25,854	24,872
Recognized interest income	246	192
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	48,080	34,783
Recognized interest income	91	387
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	23,218	30,484
Recognized interest income	207	224
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	153,708	235,723
Recognized interest income	1,598	3,573
Residential [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	108,914	123,441
Recognized interest income	856	846
Card [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	66,762	71,080
Recognized interest income	857	1,052
MUAH [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	66,505	64,293
Recognized interest income	955	898
Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	83,239	71,176
Recognized interest income	¥ 2,640	¥ 1,788

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses (Roll-forward of Accrual TDRs and Other Impaired Loans) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Accrual TDRs:
Balance at beginning of period		¥ 670,255	¥ 819,819
Additions (new accrual TDR status)	[1]	40,021	65,483
Transfers to other impaired loans (including nonaccrual TDRs)		(9,623)	(16,624)
Loans sold		(26)	(16,776)
Principal payments and other		(46,855)	(140,664)
Balance at end of period	[1]	653,772	711,238
Other impaired loans (including nonaccrual TDRs):
Balance at beginning of period		660,868	896,031
Additions (new other impaired loans (including nonaccrual TDRs) status)	[1],[2]	97,596	145,885
Charge-off		(28,410)	(57,238)
Transfers to accrual TDRs		(14,548)	(20,000)
Loans sold		(2,496)	(22,482)
Principal payments and other		(112,026)	(137,124)
Balance at end of period	[1]	600,984	805,072
Card [Member]
Accrual TDRs:
Balance at beginning of period		28,541
Balance at end of period		27,377
Other impaired loans (including nonaccrual TDRs):
Additions of nonaccrual TDRs		6,870	6,489
MUAH [Member]
Accrual TDRs:
Balance at beginning of period		39,333
Balance at end of period		37,281
Other impaired loans (including nonaccrual TDRs):
Additions of nonaccrual TDRs		9,809	3,366
Krungsri [Member]
Accrual TDRs:
Balance at beginning of period		24,899
Balance at end of period		26,453
Lease receivables reported as accrual TDRs but excluded from "Additions" as impaired loans		538	880
Lease receivables excluded from accrual TDRs as impaired loans		3,642	4,644
Other impaired loans (including nonaccrual TDRs):
Lease receivables reported as nonaccrual TDRs but excluded from "Additions" as impaired loans		50	70
Lease receivables excluded from other impaired loans		1,135	628
Additions of nonaccrual TDRs		¥ 6,499	¥ 6,108
[1]	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. For the six months ended September 30, 2018, lease receivables of ¥538 million and ¥50 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 ¥3,642 million and ¥1,135 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2018.
[2]	Included in the additions of other impaired loans for the six months ended September 30, 2017 and 2018 are nonaccrual TDRs as follows: ¥6,489 million and ¥6,870 million-Card; ¥3,366 million and ¥9,809 million-MUFG Americas Holdings; and ¥6,108 million and ¥6,499 million-Krungsri, respectively.

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses (Troubled Debt Restructurings by Class) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment		¥ 64,216	¥ 82,391
Troubled debt restructurings, Post-modification outstanding recorded investment		63,787	82,113
Troubled debt restructurings that subsequently defaulted, Recorded Investment		7,280	9,163
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]
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]	20,440	28,645
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	20,440	28,603
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	1,643	2,996
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	4,594	12,502
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	4,594	12,460
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	74	368
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	43	142
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	43	142
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]	561	1,107
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	561	1,107
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]	1,505	2,343
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	1,505	2,343
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	436	680
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	12,240	9,889
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	12,240	9,889
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	615	1,778
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]	156	1,072
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	156	1,072
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	518	135
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	312	425
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	312	425
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]	1,029	919
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	1,029	919
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]		25
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	5,649	9,983
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	5,649	9,983
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]	4,235	5,459
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	4,235	5,459
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	83	124
Card [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	10,382	9,570
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	9,953	9,334
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	1,810	1,977
MUAH [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	11,621	18,878
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	11,621	18,878
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	199	2,331
Krungsri [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	11,889	9,856
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	11,889	9,856
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	¥ 3,545	¥ 1,735
[1]	For the six months ended September 30, 2017 and 2018, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUFG Americas Holdings and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment.
[2]	TDRs for the Commercial and Residential segments include accruing loans, and do not include nonaccrual loans.
[3]	TDRs for the Card, MUFG Americas Holdings and Krungsri segments include accrual and nonaccrual loans.

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses (Outstanding Recorded Investment Balances of Troubled Debt Restructurings by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		¥ 748,404	¥ 764,243
Commercial [Member] | Domestic [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	469,793	482,566
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	317,379	320,702
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	5,008	7,362
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	30,160	33,289
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	19,619	23,987
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	71,529	70,119
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	142	6
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	11,939	12,837
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	8,594	9,712
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	5,423	4,552
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	55,953	54,182
Residential [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	36,915	40,734
Card [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[2]	66,174	67,352
MUAH [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[2]	63,543	65,373
Krungsri [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[2]	56,026	54,036
Nonaccrual [Member] | Card [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		38,797	38,811
Nonaccrual [Member] | MUAH [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		26,262	26,040
Nonaccrual [Member] | Krungsri [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		¥ 25,931	¥ 24,855
[1]	TDRs for the Commercial and Residential segments include accruing loans and do not include nonaccrual loans.
[2]	TDRs for the Card, MUFG Americas Holdings and Krungsri segments include accrual and nonaccrual loans. Included in the outstanding recorded investment balances as of March 31, 2018 and September 30, 2018 are nonaccrual TDRs as follows: ¥38,811 million and ¥38,797 million-Card; ¥26,040 million and ¥26,262 million-MUFG Americas Holdings; and ¥24,855 million and ¥25,931 million-Krungsri, respectively.

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses (Credit Quality Indicators of Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	¥ 88,372,483	¥ 87,766,515
Commercial [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		86,133,355	85,111,432
Commercial [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,891,103	2,271,789
Commercial [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		348,025	383,294
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	26,855	27,325
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		11,194	12,035
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		12,391	11,728
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		3,270	3,562
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	50,482,417	51,012,654
Commercial [Member] | Domestic [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		48,890,218	49,050,274
Commercial [Member] | Domestic [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,341,229	1,690,924
Commercial [Member] | Domestic [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		250,970	271,456
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	10,710,604	10,869,889
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		10,346,070	10,215,497
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		312,971	596,662
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		51,563	57,730
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	698,336	780,721
Commercial [Member] | Domestic [Member] | Construction [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		647,261	727,932
Commercial [Member] | Domestic [Member] | Construction [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		42,713	43,673
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		8,362	9,116
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	11,681,568	11,691,914
Commercial [Member] | Domestic [Member] | Real Estate [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		11,404,353	11,379,291
Commercial [Member] | Domestic [Member] | Real Estate [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		252,057	279,931
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		25,158	32,692
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	2,567,130	2,667,354
Commercial [Member] | Domestic [Member] | Services [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		2,369,508	2,467,540
Commercial [Member] | Domestic [Member] | Services [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		173,272	175,733
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		24,350	24,081
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	7,832,723	7,970,959
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		7,414,787	7,518,383
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		345,008	374,706
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		72,928	77,870
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	4,872,979	4,812,349
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,863,465	4,800,281
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		7,860	10,923
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		1,654	1,145
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	1,550,276	1,551,204
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,494,291	1,491,093
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		44,645	48,153
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		11,340	11,958
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	8,942,357	8,937,934
Commercial [Member] | Domestic [Member] | Other Industries [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		8,778,527	8,780,517
Commercial [Member] | Domestic [Member] | Other Industries [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		124,001	120,466
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		39,829	36,951
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	1,626,444	1,730,330
Commercial [Member] | Domestic [Member] | Consumer [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,571,956	1,669,740
Commercial [Member] | Domestic [Member] | Consumer [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		38,702	40,677
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		15,786	19,913
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	37,863,211	36,726,536
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		37,231,943	36,049,123
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		537,483	569,137
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		93,785	108,276
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	13,860,329	14,080,236
Residential [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		13,794,000	14,012,978
Residential [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		66,329	67,258
Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	581,789	589,815
Card [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		519,794	528,108
Card [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		61,995	61,707
MUAH [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1],[2]	9,095,696	9,060,459
FDIC covered loans acquired with deteriorated credit quality and small business loans which are not individually rated		825	953
MUAH [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,517,991	4,360,445
MUAH [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		13,596	14,238
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,403,693	4,509,044
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		57,260	59,890
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		103,156	116,842
Krungsri [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	5,808,825	5,605,650
Krungsri [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		5,496,214	5,284,018
Krungsri [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		197,527	198,526
Krungsri [Member] | Substandard or Doubtful or Doubtful of Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		¥ 115,084	¥ 123,106
[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 MUFG Americas Holdings do not include Federal Deposit Insurance Corporation ("FDIC") covered loans which are not individually rated totaling ¥953 million and ¥825 million at March 31, 2018 and September 30, 2018, 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 Cred_12

Loans and Allowance for Credit Losses (Ages of Past Due Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		¥ 477,472	¥ 490,720
Loans, current		117,185,120	116,545,125
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	117,662,592	117,035,845
Loans, greater than 90 days past due and accruing		14,652	19,079
1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		256,655	262,572
Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		220,817	228,148
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		59,976	57,203
Loans, current		50,422,441	50,955,451
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	50,482,417	51,012,654
Loans, greater than 90 days past due and accruing		5,551	6,419
Commercial [Member] | Domestic [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		13,946	13,290
Commercial [Member] | Domestic [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		46,030	43,913
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		3,062	2,795
Loans, current		10,707,542	10,867,094
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	10,710,604	10,869,889
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,368	1,495
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,694	1,300
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		902	796
Loans, current		697,434	779,925
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	698,336	780,721
Loans, greater than 90 days past due and accruing		13
Commercial [Member] | Domestic [Member] | Construction [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		589	359
Commercial [Member] | Domestic [Member] | Construction [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		313	437
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		7,046	5,315
Loans, current		11,674,522	11,686,599
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	11,681,568	11,691,914
Loans, greater than 90 days past due and accruing		1,948	1,633
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		2,302	2,090
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		4,744	3,225
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,496	1,645
Loans, current		2,565,634	2,665,709
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	2,567,130	2,667,354
Loans, greater than 90 days past due and accruing			26
Commercial [Member] | Domestic [Member] | Services [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		707	1,025
Commercial [Member] | Domestic [Member] | Services [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		789	620
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		6,141	8,084
Loans, current		7,826,582	7,962,875
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	7,832,723	7,970,959
Loans, greater than 90 days past due and accruing		73	1,349
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		4,181	3,886
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		1,960	4,198
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		24	21
Loans, current		4,872,955	4,812,328
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	4,872,979	4,812,349
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		24	21
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,351	985
Loans, current		1,548,925	1,550,219
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	1,550,276	1,551,204
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		1,170	657
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		181	328
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		30,877	28,566
Loans, current		8,911,480	8,909,368
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	8,942,357	8,937,934
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		229	251
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		30,648	28,315
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		9,077	8,996
Loans, current		1,617,367	1,721,334
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	1,626,444	1,730,330
Loans, greater than 90 days past due and accruing		3,517	3,411
Commercial [Member] | Domestic [Member] | Consumer [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		3,400	3,527
Commercial [Member] | Domestic [Member] | Consumer [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		5,677	5,469
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		31,038	32,167
Loans, current		37,832,173	36,694,369
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	37,863,211	36,726,536
Loans, greater than 90 days past due and accruing		916	1,083
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		12,655	12,512
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		18,383	19,655
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		86,587	97,472
Loans, current		13,765,686	13,974,118
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	13,852,273	14,071,590
Loans, greater than 90 days past due and accruing		7,422	10,806
Residential [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		70,006	78,073
Residential [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		16,581	19,399
Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		49,758	51,105
Loans, current		528,174	528,284
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	577,932	579,389
Card [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		17,700	18,887
Card [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		32,058	32,218
MUAH [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		34,990	36,793
Loans, current		9,048,818	9,009,426
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	9,083,808	9,046,219
Loans, greater than 90 days past due and accruing		763	771
FDIC covered loans not subject to the guidance on loans and debt securities acquired with deteriorated credit quality			5
MUAH [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		21,226	23,145
MUAH [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		13,764	13,648
Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		215,123	215,980
Loans, current		5,587,828	5,383,477
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	5,802,951	5,599,457
Krungsri [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		121,122	116,665
Krungsri [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		¥ 94,001	¥ 99,315
[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 MUFG Americas Holdings do not include ¥5 million and nil of FDIC covered loans at March 31, 2018 and September 30, 2018, respectively, which are not subject to the guidance on loans and debt securities acquired with deteriorated credit quality.

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses (Changes in Allowance for Credit Losses by Portfolio Segment) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		¥ 764,124	¥ 1,182,188
Provision for (reversal of) credit losses		(71,060)	(186,568)	[1]
Charge-offs		74,603	104,004
Recoveries		19,099	23,656
Net charge-offs		55,504	80,348
Others	[2]	(2,951)	909
Balance at end of period		634,609	916,181
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		491,098	900,686
Provision for (reversal of) credit losses		(104,297)	(207,025)
Charge-offs		22,432	55,204
Recoveries		6,616	12,376
Net charge-offs		15,816	42,828
Others	[2]	3,368	1,709
Balance at end of period		374,353	652,542
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		42,546	67,336
Provision for (reversal of) credit losses		(1,651)	(16,024)
Charge-offs		1,648	2,238
Recoveries		416	666
Net charge-offs		1,232	1,572
Balance at end of period		39,663	49,740
Card [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		32,119	30,165
Provision for (reversal of) credit losses		12,400	10,669
Charge-offs		12,401	11,047
Recoveries		500	695
Net charge-offs		11,901	10,352
Balance at end of period		32,618	30,482
MUAH [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		53,765	73,733
Provision for (reversal of) credit losses		1,423	(5,882)
Charge-offs		7,909	9,241
Recoveries		1,448	1,547
Net charge-offs		6,461	7,694
Others	[2]	(1,274)	(2,679)
Balance at end of period		47,453	57,478
Krungsri [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		144,596	110,268
Provision for (reversal of) credit losses		21,065	31,694
Charge-offs		30,213	26,274
Recoveries		10,119	8,372
Net charge-offs		20,094	17,902
Others	[2]	(5,045)	1,879
Balance at end of period		¥ 140,522	¥ 125,939
[1]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.
[2]	Others are principally comprised of gains or losses from foreign exchange translation.

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses (Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
Allowance for credit losses:
Individually evaluated for impairment		¥ 380,817	¥ 489,718
Collectively evaluated for impairment		238,290	260,709
Loans acquired with deteriorated credit quality		15,502	13,697
Total		634,609	764,124	¥ 916,181	¥ 1,182,188
Loans:
Individually evaluated for impairment		1,245,938	1,321,738
Collectively evaluated for impairment		116,416,654	115,714,112
Loans acquired with deteriorated credit quality		57,355	67,778
Total	[1]	117,719,947	117,103,628
Commercial [Member]
Allowance for credit losses:
Individually evaluated for impairment		310,492	414,706
Collectively evaluated for impairment		50,080	64,375
Loans acquired with deteriorated credit quality		13,781	12,017
Total		374,353	491,098	652,542	900,686
Loans:
Individually evaluated for impairment		926,053	977,945
Collectively evaluated for impairment		87,419,575	86,761,245
Loans acquired with deteriorated credit quality		26,855	27,325
Total	[1]	88,372,483	87,766,515
Residential [Member]
Allowance for credit losses:
Individually evaluated for impairment		14,275	16,644
Collectively evaluated for impairment		24,042	24,718
Loans acquired with deteriorated credit quality		1,346	1,184
Total		39,663	42,546	49,740	67,336
Loans:
Individually evaluated for impairment		105,647	110,197
Collectively evaluated for impairment		13,746,626	13,961,393
Loans acquired with deteriorated credit quality		8,056	8,646
Total	[1]	13,860,329	14,080,236
Card [Member]
Allowance for credit losses:
Individually evaluated for impairment		21,686	21,223
Collectively evaluated for impairment		10,921	10,884
Loans acquired with deteriorated credit quality		11	12
Total		32,618	32,119	30,482	30,165
Loans:
Individually evaluated for impairment		65,805	66,957
Collectively evaluated for impairment		512,127	512,432
Loans acquired with deteriorated credit quality		3,857	10,426
Total	[1]	581,789	589,815
MUAH [Member]
Allowance for credit losses:
Individually evaluated for impairment		6,464	7,743
Collectively evaluated for impairment		40,655	45,571
Loans acquired with deteriorated credit quality		334	451
Total		47,453	53,765	57,478	73,733
Loans:
Individually evaluated for impairment		67,978	82,545
Collectively evaluated for impairment		9,015,830	8,963,679
Loans acquired with deteriorated credit quality		12,713	15,188
Total	[1]	9,096,521	9,061,412
Krungsri [Member]
Allowance for credit losses:
Individually evaluated for impairment		27,900	29,402
Collectively evaluated for impairment		112,592	115,161
Loans acquired with deteriorated credit quality		30	33
Total		140,522	144,596	¥ 125,939	¥ 110,268
Loans:
Individually evaluated for impairment		80,455	84,094
Collectively evaluated for impairment		5,722,496	5,515,363
Loans acquired with deteriorated credit quality		5,874	6,193
Total	[1]	¥ 5,808,825	¥ 5,605,650
[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_3

Goodwill and Other Intangible Assets (Narrative) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Goodwill and Other Intangible Assets [Line Items]
Impairment losses for intangible assets, whose carrying amounts exceeded their fair value	¥ 667	¥ 16,591	[1]
Business Segment [Member] | Customer Business [Member] | Trust Assets Business Group [Member] | Customer Relationships [Member] | Foreign [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses for intangible assets, whose carrying amounts exceeded their fair value		¥ 11,121
[1]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Movement in Carrying Amount of Goodwill) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, at beginning of period	¥ 2,533,471	¥ 2,542,280
Accumulated impairment losses, at beginning of period	(2,092,137)	(2,092,137)
Goodwill, Net at beginning of period	441,334	450,143
Foreign currency translation adjustments and other	(10,179)	(14,590)
Goodwill, at end of period	2,523,292	2,527,690
Accumulated impairment losses, at end of period	(2,092,137)	(2,092,137)
Goodwill, Net at end of period	¥ 431,155	¥ 435,553

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Carrying Amount of Other Intangible Assets by Major Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Intangible assets subject to amortization:
Net carrying amount		¥ 996,655	¥ 995,627
Intangible assets not subject to amortization:
Net carrying amount, Other	[1]	25,198	15,492
Total intangible assets, Net carrying amount		1,021,853	1,011,119
Mortgage Servicing Rights [Member]
Intangible assets not subject to amortization:
Net carrying amount, Other		16,346	7,268
Software [Member]
Intangible assets subject to amortization:
Net carrying amount		755,547	732,828
Core Deposit Intangibles [Member]
Intangible assets subject to amortization:
Net carrying amount		40,543	45,297
Customer Relationships [Member]
Intangible assets subject to amortization:
Net carrying amount		150,612	164,753
Trade Names [Member]
Intangible assets subject to amortization:
Net carrying amount		44,494	47,020
Other [Member]
Intangible assets subject to amortization:
Net carrying amount		¥ 5,459	¥ 5,729
[1]	Intangible assets not subject to amortization includes mortgage servicing rights accounted for at fair value of ¥7,268 million and ¥16,346 million at March 31, 2018 and September 30, 2018, respectively.

Pledged Assets and Collateral (

Pledged Assets and Collateral (Narrative) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2018	Mar. 31, 2018
Financial Instruments Pledged as Collateral [Abstract]
Investment securities pledged for acting as a collection agent of public funds	¥ 19,516,177
Cash collateral pledged for derivative transactions included in Other assets	1,765,418	¥ 1,473,109
Cash collateral received for derivative transactions included in Other liabilities	¥ 860,072	¥ 1,158,053

Pledged Assets and Collateral_3

Pledged Assets and Collateral (Assets Mortgaged, Pledged, or Otherwise Subject to Lien) (Detail) ¥ in Millions	Sep. 30, 2018JPY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 30,889,784
Trading Account Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	7,703,892
Investment Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	9,178,501
Loans [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	13,956,677
Other [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 50,714

Pledged Assets and Collateral_4

Pledged Assets and Collateral (Pledged Assets Classified by Type of Liabilities) (Detail) ¥ in Millions	Sep. 30, 2018JPY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 30,889,784
Deposits [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	268,091
Call Money and Funds Purchased [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	16,351
Payables under Repurchase Agreements and Securities Lending Transactions [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	16,269,396
Other Short-term Borrowings and Long-term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	14,319,750
Other [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 16,196

Severance Indemnities and Pen_3

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, 2018	Sep. 30, 2017
Domestic Subsidiaries [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	¥ 24,205	¥ 23,539
Interest cost on projected benefit obligation	6,764	7,266
Expected return on plan assets	(37,170)	(34,144)
Amortization of net actuarial loss	612	3,946
Amortization of prior service cost	(604)	(580)
Gain on settlements and curtailment	(3,901)	(2,019)
Net periodic benefit cost (income)	(10,094)	(1,992)
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	5,975	5,646
Interest cost on projected benefit obligation	7,407	7,651
Expected return on plan assets	(16,413)	(16,069)
Amortization of net actuarial loss	3,492	5,740
Amortization of prior service cost	(1,496)	(1,547)
Net periodic benefit cost (income)	(1,035)	1,421
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	271	348
Interest cost on projected benefit obligation	515	540
Expected return on plan assets	(1,139)	(1,062)
Amortization of net actuarial loss	349	563
Amortization of prior service cost	(995)	(1,391)
Net periodic benefit cost (income)	¥ (999)	¥ (1,002)

Severance Indemnities and Pen_4

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, 2018JPY (¥)
Domestic Subsidiaries [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
For the six months ended September 30, 2018	¥ 36.4
For the remainder of the fiscal year ending March 31, 2019	8.1
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
For the six months ended September 30, 2018	1.2
For the remainder of the fiscal year ending March 31, 2019	0.4
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
For the six months ended September 30, 2018	0.2
For the remainder of the fiscal year ending March 31, 2019	¥ 0.2

Offsetting of Derivatives, Re_3

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, 2018	Mar. 31, 2018
Offsetting [Abstract]
Derivative assets, Gross amounts of recognized assets/liabilities		¥ 11,661,000	¥ 12,585,000
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]	11,661,000	12,585,000
Derivative assets, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(9,056,000)	(9,664,000)
Derivative assets, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(567,000)	(832,000)
Derivative assets, Net amounts		2,038,000	2,089,000
Receivables under resale agreements, Gross amounts of recognized assets/liabilities		13,720,000	8,825,000
Receivables under resale agreements, Gross amounts offset in the condensed consolidated balance sheet		(2,454,000)	(3,099,000)
Receivables under resale agreements, Net amounts presented in the condensed consolidated balance sheet		11,266,000	5,726,000
Receivables under resale agreements, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(10,319,000)	(5,171,000)
Receivables under resale agreements, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(19,000)	(17,000)
Receivables under resale agreements, Net amounts		928,000	538,000
Receivables under securities borrowing transactions, Gross amounts of recognized assets/liabilities		3,137,000	9,305,000
Receivables under securities borrowing transactions, Gross amounts offset in the condensed consolidated balance sheet		(24,000)	(36,000)
Receivables under securities borrowing transactions, Net amounts presented in the condensed consolidated balance sheet		3,113,172	9,268,756
Receivables under securities borrowing transactions, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(3,050,000)	(9,208,000)
Receivables under securities borrowing transactions, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged			(1,000)
Receivables under securities borrowing transactions, Net amounts		63,000	60,000
Financial assets, Gross amounts of recognized assets/liabilities, Total		28,518,000	30,715,000
Financial assets, Gross amounts offset in the condensed consolidated balance sheet, Total		(2,478,000)	(3,135,000)
Financial assets, Net amounts presented in the condensed consolidated balance sheet, Total		26,040,000	27,580,000
Financial assets, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments, Total		(22,425,000)	(24,043,000)
Financial assets, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged, Total		(586,000)	(850,000)
Financial assets, Net amounts, Total		3,029,000	2,687,000
Derivative liabilities, Gross amounts of recognized assets/liabilities		11,665,000	11,877,000
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]	11,665,000	11,877,000
Derivative liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(8,798,000)	(9,631,000)
Derivative liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(1,407,000)	(1,126,000)
Derivative liabilities, Net amounts		1,460,000	1,120,000
Payables under repurchase agreements, Gross amounts of recognized assets/liabilities		28,029,000	21,169,000
Payables under repurchase agreements, Gross amounts offset in the condensed consolidated balance sheet		(2,425,000)	(3,034,000)
Payables under repurchase agreements, Net amounts presented in the condensed consolidated balance sheet		25,604,000	18,135,000
Payables under repurchase agreements, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(25,077,000)	(17,890,000)
Payables under repurchase agreements, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(42,000)	(31,000)
Payables under repurchase agreements, Net amounts		485,000	214,000
Payables under securities lending transactions, Gross amounts of recognized assets/liabilities		1,924,000	8,206,000
Payables under securities lending transactions, Gross amounts offset in the condensed consolidated balance sheet		(24,000)	(36,000)
Payables under securities lending transactions, Net amounts presented in the condensed consolidated balance sheet		1,900,033	8,170,218
Payables under securities lending transactions, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(1,849,000)	(8,139,000)
Payables under securities lending transactions, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(7,000)	(12,000)
Payables under securities lending transactions, Net amounts		44,000	19,000
Obligations to return securities received as collateral, Gross amounts of recognized assets/liabilities		3,427,000	3,177,000
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		3,427,158	3,176,962
Obligations to return securities received as collateral, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(1,290,000)	(1,072,000)
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		2,137,000	2,105,000
Financial liabilities, Gross amounts of recognized assets/liabilities, Total		45,045,000	44,429,000
Financial liabilities, Gross amounts offset in the condensed consolidated balance sheet, Total		(2,449,000)	(3,070,000)
Financial liabilities, Net amounts presented in the condensed consolidated balance sheet, Total		42,596,000	41,359,000
Financial liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments, Total		(37,014,000)	(36,732,000)
Financial liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged, Total		(1,456,000)	(1,169,000)
Financial liabilities, Net amounts, Total		¥ 4,126,000	¥ 3,458,000
[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, 2018.
[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.

Repurchase Agreements, and Se_3

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, 2018	Mar. 31, 2018
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	¥ 28,029	¥ 21,169
Payables under securities lending transactions	1,924	8,206
Obligations to return securities received as collateral	3,427	3,177
Total	33,380	32,552
Overnight and Open [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	4,960	2,290
Payables under securities lending transactions	1,472	4,647
Obligations to return securities received as collateral	3,075	2,855
Total	9,507	9,792
30 Days or Less [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	16,192	14,328
Payables under securities lending transactions	436	2,343
Obligations to return securities received as collateral	245	202
Total	16,873	16,873
31-90 Days [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	3,603	2,004
Payables under securities lending transactions	16	1,216
Obligations to return securities received as collateral	105	120
Total	3,724	3,340
Over 90 Days [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	3,274	2,547
Obligations to return securities received as collateral	2
Total	¥ 3,276	¥ 2,547

Repurchase Agreements, and Se_4

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, 2018	Mar. 31, 2018
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	¥ 28,029	¥ 21,169
Payables under securities lending transactions	1,924	8,206
Obligations to return securities received as collateral	3,427	3,177
Total	33,380	32,552
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	9,822	2,462
Payables under securities lending transactions	691	7,085
Obligations to return securities received as collateral	1,390	1,242
Total	11,903	10,789
Foreign Governments and Official Institutions Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	12,577	14,316
Payables under securities lending transactions	24	36
Obligations to return securities received as collateral	1,256	1,344
Total	13,857	15,696
Corporate Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	771	570
Obligations to return securities received as collateral	129	84
Total	900	654
Residential Mortgage-backed Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	4,517	3,567
Total	4,517	3,567
Other Debt Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	85	121
Total	85	121
Marketable Equity Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	103	123
Payables under securities lending transactions	1,208	1,085
Obligations to return securities received as collateral	648	507
Total	1,959	1,715
Others [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	154	10
Payables under securities lending transactions	1
Obligations to return securities received as collateral	4
Total	¥ 159	¥ 10

Accumulated Other Comprehensi_3

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, 2018	Sep. 30, 2017	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains (losses) on investment securities, Balance at beginning of period	[1]	¥ 2,270,346	¥ 2,032,807
Net unrealized gains (losses) on investment securities, Net change during the period	[1]	(91,819)	253,088
Net unrealized gains (losses) on investment securities, Balance at end of period	[1]	(521,804)	2,285,895
Net debt valuation adjustments, Balance at beginning of period		(16,488)	(10,632)
Net debt valuation adjustments, Net change during the period		(2,226)	(5,779)
Net debt valuation adjustments, Balance at end of period		(20,625)	(16,411)
Net unrealized losses on derivatives qualifying for cash flow hedges, Balance at beginning of period		(19,250)	(8,729)
Net unrealized losses on derivatives qualifying for cash flow hedges, Net change during the period		(6,843)	(626)
Net unrealized losses on derivatives qualifying for cash flow hedges, Balance at end of period		(26,093)	(9,355)
Defined benefit plans, Balance at beginning of period		(119,593)	(214,062)
Defined benefit plans, Net change during the period		16,459	24,604
Defined benefit plans, Balance at end of period		(103,134)	(189,458)
Foreign currency translation adjustments, Balance at beginning of period		362,300	482,039
Foreign currency translation adjustments, Net change during the period		37,116	(37,968)
Foreign currency translation adjustments, Balance at end of period		399,416	444,071
Accumulated other comprehensive income (loss), net of taxes: Balance at end of period		(272,240)	¥ 2,514,742	¥ 2,477,315
Net Unrealized Gains (Losses) on Investment Securities [Member] | Recognition and Measurement of Financial Assets and Financial Liabilities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effect of adopting new guidance	[1]	(2,700,331)
Net Debt Valuation Adjustments [Member] | Recognition and Measurement of Financial Assets and Financial Liabilities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effect of adopting new guidance		¥ (1,911)
[1]	Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018.

Accumulated Other Comprehensi_4

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, 2018	Sep. 30, 2017
Net unrealized gains (losses) on investment securities, Before tax:
Net unrealized gains (losses) on investment securities	[1]	¥ (94,429)	¥ 540,758
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		(14,494)	(175,398)
Net change		(108,923)	365,360
Net unrealized gains (losses) on investment securities, Tax (expense) or benefit:
Net unrealized gains (losses) on investment securities	[1]	29,952	(169,917)
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		4,626	52,011
Net change		34,578	(117,906)
Net unrealized gains (losses) on investment securities, Net of tax:
Net unrealized gains (losses) on investment securities	[1]	(64,477)	370,841
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		(9,868)	(123,387)
Net change	[1]	(74,345)	247,454
Net unrealized gains (losses) on investment securities attributable to noncontrolling interests		17,474	(5,634)
Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group	[1]	(91,819)	253,088
Net debt valuation adjustments, Before tax:
Net debt valuation adjustments		(4,038)	(8,218)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests		829	(111)
Net change		(3,209)	(8,329)
Net debt valuation adjustments, Tax (expense) or benefit:
Net debt valuation adjustments		1,236	2,516
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests		(253)	34
Net change		983	2,550
Net debt valuation adjustments, Net of tax:
Net debt valuation adjustments		(2,802)	(5,702)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests		576	(77)
Net change		(2,226)	(5,779)
Net debt valuation adjustments attributable to noncontrolling interests
Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group		(2,226)	(5,779)
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Before tax:
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges		(10,138)	4,450
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		735	(5,584)
Net change		(9,403)	(1,134)
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Tax (expense) or benefit:
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges		2,774	(1,641)
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		(214)	2,149
Net change		2,560	508
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Net of tax:
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges		(7,364)	2,809
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		521	(3,435)
Net change		(6,843)	(626)
Net unrealized gains on derivatives qualifying for cash flow hedges attributable to noncontrolling interests
Net unrealized losses on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group		(6,843)	(626)
Defined benefit plans, Before tax:
Defined benefit plans		26,282	31,778
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		(2,643)	4,659
Net change		23,639	36,437
Defined benefit plans, Tax (expense) or benefit:
Defined benefit plans		(8,022)	(10,240)
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		878	(1,588)
Net change		(7,144)	(11,828)
Defined benefit plans, Net of tax:
Defined benefit plans		18,260	21,538
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		(1,765)	3,071
Net change		16,495	24,609
Defined benefit plans attributable to noncontrolling interests		36	5
Defined benefit plans attributable to Mitsubishi UFJ Financial Group		16,459	24,604
Foreign currency translation adjustments, Before tax:
Foreign currency translation adjustments		63,376	(35,954)
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		(2,685)	2,961
Net change		60,691	(32,993)
Foreign currency translation adjustments, Tax (expense) or benefit:
Foreign currency translation adjustments		(35,893)	(2,932)
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		851
Net change		(35,042)	(2,932)
Foreign currency translation adjustments, Net of tax:
Foreign currency translation adjustments		27,483	(38,886)
Reclassification adjustment for gains (losses) included in net income before attribution of noncontrolling interests		(1,834)	2,961
Net change		25,649	(35,925)
Foreign currency translation adjustments attributable to noncontrolling interests		(11,467)	2,043
Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group		37,116	(37,968)
Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group		¥ (47,313)	¥ 233,319
[1]	Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018.

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income (Loss) (Reclassification of Significant Items out of Accumulated OCI) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains-net	[1],[2]	¥ (422,998)	¥ (176,149)	[3]
Equity in earnings of equity method investees-net		(140,014)	(88,717)	[3]
Interest income on Loans, including fees		(1,236,933)	(1,098,107)
Other non-interest income		(63,078)	(44,282)
Other non-interest expenses		(160,349)	(131,968)
Total before tax		(695,767)	(1,014,434)
Income tax expense		143,212	234,336
Net of tax		(552,555)	(780,098)	[3]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(18,258)	(173,473)
Income tax expense		5,888	52,606
Net of tax		(12,370)	(120,867)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other		(18)	6,132
Total before tax		(14,494)	(175,398)
Income tax expense		4,626	52,011
Net of tax		(9,868)	(123,387)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Investment Securities [Member] | Net Gains on Sales and Redemptions of Available-for-sale debt Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains-net	[4]	(14,476)	(181,530)
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		829	(111)
Total before tax		829	(111)
Income tax expense		(253)	34
Net of tax		576	(77)
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		(81)	(113)
Total before tax		735	(5,584)
Income tax expense		(214)	2,149
Net of tax		521	(3,435)
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		816	(5,471)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(2,643)	4,659
Income tax expense		878	(1,588)
Net of tax		(1,765)	3,071
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans [Member] | Net actuarial loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest expenses	[5]	4,452	10,249
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans [Member] | Prior service cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest expenses	[5]	(3,095)	(3,518)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans [Member] | Loss (gain) on settlements and curtailment, and other [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest expenses	[5]	(4,000)	(2,072)
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 income		(2,686)
Other non-interest expenses		1	2,961
Total before tax		(2,685)	2,961
Income tax expense		851
Net of tax		¥ (1,834)	¥ 2,961
[1]	New guidance on recognition and measurement of financial assets and financial liabilities requires equity investments to be measured at fair value with changes in fair value recognized in net income in six months ended on September 30, 2018. For additional information, refer to Note1.
[2]	The following credit losses are included in Investment securities gains-net: Decline in fair value by ¥95 million and ¥81 million; Other comprehensive income-net by ¥13 million and ¥4 million; Total credit losses by ¥108 million and ¥85 million, for the six months ended September 30, 2017 and 2018, respectively.
[3]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.
[4]	Included unrealized gains (losses) related to only debt securities in six months ended on September 30, 2018, while included unrealized gains (losses) related to both debt and equity securities in six months ended on September 30, 2017.
[5]	These Accumulated OCI components are components 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, 2018	Sep. 30, 2017
Noncontrolling Interest [Abstract]
Net income attributable to Mitsubishi UFJ Financial Group	¥ 553,251	¥ 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	36	54
Net transfers from (to) the noncontrolling interest shareholders	36	(34,697)
Change from net income attributable to Mitsubishi UFJ Financial Group and transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders	¥ 553,287	¥ 756,007

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Detail) - JPY (¥) ¥ in Billions		6 Months Ended		12 Months Ended
		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Cash Flow Hedge:
Derivative, Notional Amount	[1]	¥ 1,599,800		¥ 1,456,500
Credit Derivatives:
Carrying value of credit protection, offsetting with purchased protection with identical underlying referenced entities, in approximate		38		52
Notional amounts of credit protection, offsetting with purchased protection with identical underlying referenced entities, in approximate		2,438		2,416
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		600		700
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a liability position, posted collateral, in approximate		83		127
Additional collateral amount which could be requested if the MUFG Group's debt falls below investment grade		79		78
Early termination amount which could be requested if the MUFG Group's debt falls below investment grade		¥ 93		¥ 65
MUAH [Member]
Cash Flow Hedge:
Approximate losses expected to be reclassified to net interest income during the twelve months ending June 30, 2019			¥ (7.5)
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 [Member]
Cash Flow Hedge:
Derivative, Description of hedged item			Benchmark interest rate on LIBOR indexed short-term borrowings
MUAH [Member] | Interest Rate Swap [Member] | Maximum [Member]
Fair Value Hedges:
Losses on the hedging instruments			¥ 1
Gains on the hedged liability			¥ 1
MUAH [Member] | Cash Flow Hedging [Member] | Weighted Average [Member]
Cash Flow Hedge:
Remaining life of the active cash flow hedges, in years			2 years 1 month 6 days
MUAH [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Cash Flow Hedge:
Derivative, Notional Amount			¥ 20
[1]	Includes both written and purchased positions.

Derivative Financial Instrume_4

Derivative Financial Instruments (Notional Amounts of Derivative Contracts) (Detail) - JPY (¥) ¥ in Trillions		Sep. 30, 2018	Mar. 31, 2018
Derivative [Line Items]
Notional amounts of derivatives	[1]	¥ 1,599.8	¥ 1,456.5
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	1,359.2	1,219.7
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	223.9	220.8
Equity Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	6.9	6.1
Commodity Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	0.2	0.3
Credit Derivatives [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	6.7	6.5
Others [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	¥ 2.9	¥ 3.1
[1]	Includes both written and purchased positions.

Derivative Financial Instrume_5

Derivative Financial Instruments (Fair Value Information on Derivative Instruments Recorded on Condensed Consolidated Balance Sheets) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2018	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	¥ 11,661	¥ 12,585
Fair value of derivative liabilities	[1],[2],[3]	11,665	11,877
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	7,808	8,712
Fair value of derivative liabilities	[1],[2],[3]	7,916	8,691
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	3,538	3,557
Fair value of derivative liabilities	[1],[2],[3]	3,496	3,000
Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	219	207
Fair value of derivative liabilities	[1],[2],[3]	268	227
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	31	35
Fair value of derivative liabilities	[1],[2],[3]	30	33
Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	63	72
Fair value of derivative liabilities	[1],[2],[3]	72	71
Others [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	2	2
Fair value of derivative liabilities	[1],[2],[3],[4]	(117)	(145)
Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	11,661	12,585
Fair value of derivative liabilities	[1],[2],[5]	11,665	11,860
Not Designated as Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	7,808	8,712
Fair value of derivative liabilities	[1],[2],[5]	7,916	8,674
Not Designated as Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	3,538	3,557
Fair value of derivative liabilities	[1],[2],[5]	3,496	3,000
Not Designated as Hedging Instruments [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	219	207
Fair value of derivative liabilities	[1],[2],[5]	268	227
Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	31	35
Fair value of derivative liabilities	[1],[2],[5]	30	33
Not Designated as Hedging Instruments [Member] | Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	63	72
Fair value of derivative liabilities	[1],[2],[5]	72	71
Not Designated as Hedging Instruments [Member] | Others [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	2	2
Fair value of derivative liabilities	[1],[2],[4],[5]	(117)	(145)
Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[6]		17
Designated as Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[6]		17
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, 2018.
[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 (6).
[6]	The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by MUFG Americas Holdings. 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 Instrume_6

Derivative Financial Instruments (Gains and Losses for Trading and Risk Management Derivatives (Not Designated as Hedging Instruments)) (Detail) - JPY (¥) ¥ in Billions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	¥ (520)	¥ (352)
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(53)	(8)
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(287)	(158)
Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(115)	(146)
Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(5)	(1)
Others [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(60)	(39)
Foreign Exchange Gains (Losses)-Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(292)	(159)
Foreign Exchange Gains (Losses)-Net [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)
Foreign Exchange Gains (Losses)-Net [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(287)	(158)
Foreign Exchange Gains (Losses)-Net [Member] | Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)
Foreign Exchange Gains (Losses)-Net [Member] | Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)
Foreign Exchange Gains (Losses)-Net [Member] | Others [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(5)	(1)
Trading Account Profits (Losses)-Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(228)	(193)
Trading Account Profits (Losses)-Net [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(53)	(8)
Trading Account Profits (Losses)-Net [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)
Trading Account Profits (Losses)-Net [Member] | Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(115)	(146)
Trading Account Profits (Losses)-Net [Member] | Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	(5)	(1)
Trading Account Profits (Losses)-Net [Member] | Others [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	¥ (55)	¥ (38)

Derivative Financial Instrume_7

Derivative Financial Instruments (Gains and Losses for Derivatives Designated as Cash Flow Hedges) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in Accumulated OCI on derivative instruments (Effective portion)			¥ (10,138)		¥ 4,450
Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in Accumulated OCI on derivative instruments (Effective portion)		¥ (11,000)		¥ 4,000
Gains (losses) reclassified from Accumulated OCI into income (Effective portion)		(1,000)		6,000
Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in Accumulated OCI on derivative instruments (Effective portion)		(11,000)		4,000
Gains (losses) reclassified from Accumulated OCI into income (Effective portion)	[1]	¥ (1,000)		¥ 6,000
[1]	Included in Interest income.

Derivative Financial Instrume_8

Derivative Financial Instruments (Protection Sold Through Credit Default Swaps) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2018	Mar. 31, 2018
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		¥ 549,578	¥ 688,151
Maximum potential/Notional amount, Expiring in 1-5 years		2,391,509	2,177,736
Maximum potential/Notional amount, Expiring over 5 years		136,077	135,513
Maximum potential/Notional amount, Total		3,077,164	3,001,400
Credit derivative (asset) liability at fair value	[1]	(41,683)	(61,212)
Protection sold [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		549,578	688,151
Maximum potential/Notional amount, Expiring in 1-5 years		2,312,010	2,103,368
Maximum potential/Notional amount, Expiring over 5 years		136,077	135,513
Maximum potential/Notional amount, Total		2,997,665	2,927,032
Credit derivative (asset) liability at fair value	[1]	(46,998)	(61,188)
Protection sold [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		501,126	608,712
Maximum potential/Notional amount, Expiring in 1-5 years		1,671,806	1,504,191
Maximum potential/Notional amount, Expiring over 5 years		125,444	89,869
Maximum potential/Notional amount, Total		2,298,376	2,202,772
Credit derivative (asset) liability at fair value	[1]	(32,433)	(36,812)
Protection 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]	365,541	440,610
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	1,392,067	1,199,269
Maximum potential/Notional amount, Expiring over 5 years	[2]	119,690	85,094
Maximum potential/Notional amount, Total	[2]	1,877,298	1,724,973
Credit derivative (asset) liability at fair value	[1],[2]	(31,119)	(33,389)
Protection 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		135,585	168,102
Maximum potential/Notional amount, Expiring in 1-5 years		275,649	259,497
Maximum potential/Notional amount, Expiring over 5 years		5,754	4,775
Maximum potential/Notional amount, Total		416,988	432,374
Credit derivative (asset) liability at fair value	[1]	(1,295)	(3,431)
Protection 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
Maximum potential/Notional amount, Expiring in 1-5 years		4,090	45,425
Maximum potential/Notional amount, Expiring over 5 years
Maximum potential/Notional amount, Total		4,090	45,425
Credit derivative (asset) liability at fair value	[1]	(19)	8
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		48,452	79,439
Maximum potential/Notional amount, Expiring in 1-5 years		640,204	599,177
Maximum potential/Notional amount, Expiring over 5 years		10,633	45,644
Maximum potential/Notional amount, Total		699,289	724,260
Credit derivative (asset) liability at fair value	[1]	(14,565)	(24,376)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | BK [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		7,000	10,000
Maximum potential/Notional amount, Expiring in 1-5 years		253,642	201,226
Maximum potential/Notional amount, Expiring over 5 years			37,781
Maximum potential/Notional amount, Total		260,642	249,007
Credit derivative (asset) liability at fair value	[1]	(4,568)	(4,692)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | BK [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[2]	7,000	3,000
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	150,293	118,359
Maximum potential/Notional amount, Expiring over 5 years	[2]		37,781
Maximum potential/Notional amount, Total	[2]	157,293	159,140
Credit derivative (asset) liability at fair value	[1],[2]	(2,966)	(3,381)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | BK [Member] | Non-investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less			7,000
Maximum potential/Notional amount, Expiring in 1-5 years		103,349	82,867
Maximum potential/Notional amount, Expiring over 5 years
Maximum potential/Notional amount, Total		103,349	89,867
Credit derivative (asset) liability at fair value	[1]	(1,602)	(1,311)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | SCHD [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		41,452	69,439
Maximum potential/Notional amount, Expiring in 1-5 years		386,562	397,951
Maximum potential/Notional amount, Expiring over 5 years		10,633	7,863
Maximum potential/Notional amount, Total		438,647	475,253
Credit derivative (asset) liability at fair value	[1]	(9,997)	(19,684)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | SCHD [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[2]	28,030	15,000
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	177,690	108,000
Maximum potential/Notional amount, Expiring over 5 years	[2]	8,869	6,000
Maximum potential/Notional amount, Total	[2]	214,589	129,000
Credit derivative (asset) liability at fair value	[1],[2]	(4,136)	(2,641)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | SCHD [Member] | Non-investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less			12,000
Maximum potential/Notional amount, Expiring in 1-5 years			29,000
Maximum potential/Notional amount, Expiring over 5 years
Maximum potential/Notional amount, Total			41,000
Credit derivative (asset) liability at fair value	[1]		(749)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | SCHD [Member] | Not Rated [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		13,422	42,439
Maximum potential/Notional amount, Expiring in 1-5 years		208,872	260,951
Maximum potential/Notional amount, Expiring over 5 years		1,764	1,863
Maximum potential/Notional amount, Total		224,058	305,253
Credit derivative (asset) liability at fair value	[1]	(5,861)	(16,294)
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]	79,499	74,368
Maximum potential/Notional amount, Expiring over 5 years	[3]
Maximum potential/Notional amount, Total	[3]	79,499	74,368
Credit derivative (asset) liability at fair value	[1],[3]	¥ 5,315	¥ (24)
[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 _3

Obligations under Guarantees and Other Off-balance Sheet Instruments (Contractual or Notional Amounts of Guarantees) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2018	Mar. 31, 2018
Guarantor Obligations [Line Items]
Contractual or Notional amount		¥ 68,821	¥ 57,341
Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		4,067	4,311
Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		3,243	3,051
Derivative Instruments [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount	[1],[2]	52,204	40,513
Liabilities of Trust Accounts [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		9,282	9,444
Others [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		¥ 25	¥ 22
[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 _4

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		Sep. 30, 2018	Mar. 31, 2018
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		¥ 68,821	¥ 57,341
Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		4,067	4,311
Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3,243	3,051
Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		7,310	7,362
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, Amount by borrower grade		4,067	4,311
Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3,243	3,051
Normal [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		7,139	7,121
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, Amount by borrower grade		3,973	4,211
Normal [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3,166	2,910
Close Watch [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade	[1]	117	196
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, Amount by borrower grade	[1]	72	83
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, Amount by borrower grade	[1]	45	113
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, Amount by borrower grade	[1]	26	18
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, Amount by borrower grade	[1]	18	13
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, Amount by borrower grade	[1]	8	5
Not Rated [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		28	27
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, Amount by borrower grade		4	4
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, Amount by borrower grade		¥ 24	¥ 23
[1]	See Notes of the tables regarding "the maximum potential amount of future payments classified based upon internal credit ratings "in Note 25 to the consolidated financial statements for the fiscal year ended March 31, 2018.

Obligations under Guarantees _5

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, 2018	Mar. 31, 2018
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	¥ 79,308	¥ 80,090
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	1,123	1,191
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	236	183
Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with regard to other off-balance sheet instruments	¥ 6	¥ 13

Contingent Liabilities (Narrati

Contingent Liabilities (Narrative) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2018	Mar. 31, 2018
Contingent Liabilities [Line Items]
Limit on aggregate credit extensions over the borrower's annual income	33.333%
Allowance for repayment of excess interest	¥ 17,686	¥ 23,724
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, 2018	Mar. 31, 2018
Variable Interest Entity [Line Items]
Total assets	¥ 300,124,250	¥ 300,570,312
Consolidated assets, Cash and due from banks	35,663,868	32,648,387
Consolidated assets, Interest-earning deposits in other banks	39,157,102	43,209,662
Consolidated assets, Trading account assets	36,087,519	35,186,689
Consolidated assets, Investment securities	42,956,424	43,654,249
Consolidated assets, Loans	117,028,623	116,271,771
Total liabilities	284,174,611	284,924,497
Consolidated liabilities, Deposits	192,878,821	195,674,593
Consolidated liabilities, Long-term debt	27,881,157	27,069,556
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Total assets	18,778,595	19,190,993
Consolidated assets, Cash and due from banks	3,366	130
Consolidated assets, Interest-earning deposits in other banks	18,601	23,161
Consolidated assets, Trading account assets	446,481	477,583
Consolidated assets, Investment securities	1,964,307	1,952,683
Consolidated assets, Loans	16,127,864	16,550,107
Consolidated assets, All other assets	217,976	187,329
Total liabilities	639,970	623,439
Consolidated liabilities, Deposits
Consolidated liabilities, Other short-term borrowings	16,401	28,451
Consolidated liabilities, Long-term debt	524,478	510,948
Consolidated liabilities, All other liabilities	99,091	84,040
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member]
Variable Interest Entity [Line Items]
Total assets	26,043,585	26,414,149
Consolidated assets, Cash and due from banks	45,317	53,584
Consolidated assets, Interest-earning deposits in other banks	43,679	82,311
Consolidated assets, Trading account assets	453,832	481,387
Consolidated assets, Investment securities	2,040,145	2,041,441
Consolidated assets, Loans	23,191,340	23,546,424
Consolidated assets, All other assets	269,272	209,002
Total liabilities	25,389,922	25,716,760
Consolidated liabilities, Deposits	7,140,178	7,103,738
Consolidated liabilities, Other short-term borrowings	4,886,919	5,220,328
Consolidated liabilities, Long-term debt	12,551,886	12,760,168
Consolidated liabilities, All other liabilities	810,939	632,526
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Asset-backed Conduits [Member]
Variable Interest Entity [Line Items]
Total assets	6,964,990	7,390,029
Consolidated assets, Cash and due from banks	44,532	52,703
Consolidated assets, Interest-earning deposits in other banks	22,700	44,902
Consolidated assets, Trading account assets	4,708	2,273
Consolidated assets, Investment securities	1,624,529	1,777,017
Consolidated assets, Loans	5,245,861	5,502,892
Consolidated assets, All other assets	22,660	10,242
Total liabilities	6,977,482	7,409,190
Consolidated liabilities, Other short-term borrowings	4,830,851	5,176,663
Consolidated liabilities, Long-term debt	1,639,594	1,708,354
Consolidated liabilities, All other liabilities	507,037	524,173
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Total assets	579,356	598,662
Consolidated assets, Cash and due from banks	72
Consolidated assets, Interest-earning deposits in other banks	6,681	10,300
Consolidated assets, Trading account assets	423,465	461,036
Consolidated assets, Investment securities	18,566	19,895
Consolidated assets, All other assets	130,572	107,431
Total liabilities	42,479	11,735
Consolidated liabilities, Long-term debt	5,152
Consolidated liabilities, All other liabilities	37,327	11,735
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Special Purpose Entities Created for Structured Financing [Member]
Variable Interest Entity [Line Items]
Total assets	211,059	198,484
Consolidated assets, Interest-earning deposits in other banks	1,760	2,332
Consolidated assets, Loans	143,800	149,194
Consolidated assets, All other assets	65,499	46,958
Total liabilities	128,028	115,353
Consolidated liabilities, Other short-term borrowings	372	587
Consolidated liabilities, Long-term debt	125,221	112,054
Consolidated liabilities, All other liabilities	2,435	2,712
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Repackaged Instruments [Member]
Variable Interest Entity [Line Items]
Total assets	276,805	152,781
Consolidated assets, Cash and due from banks	349	520
Consolidated assets, Trading account assets	25,528	17,376
Consolidated assets, Investment securities	163,082	92,210
Consolidated assets, Loans	87,106	42,632
Consolidated assets, All other assets	740	43
Total liabilities	276,100	148,928
Consolidated liabilities, Other short-term borrowings	45,699	12,676
Consolidated liabilities, Long-term debt	173,690	132,012
Consolidated liabilities, All other liabilities	56,711	4,240
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Securitization of MUFG Group's Assets [Member]
Variable Interest Entity [Line Items]
Total assets	10,650,823	10,852,539
Consolidated assets, Loans	10,625,617	10,827,488
Consolidated assets, All other assets	25,206	25,051
Total liabilities	10,612,411	10,816,672
Consolidated liabilities, Other short-term borrowings		5,000
Consolidated liabilities, Long-term debt	10,606,699	10,806,145
Consolidated liabilities, All other liabilities	5,712	5,527
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Trust Arrangements [Member]
Variable Interest Entity [Line Items]
Total assets	7,325,138	7,177,407
Consolidated assets, Interest-earning deposits in other banks	11,225	10,541
Consolidated assets, Trading account assets	131	702
Consolidated assets, Investment securities	233,928	152,277
Consolidated assets, Loans	7,077,817	7,011,255
Consolidated assets, All other assets	2,037	2,632
Total liabilities	7,319,352	7,171,852
Consolidated liabilities, Deposits	7,140,178	7,103,738
Consolidated liabilities, Other short-term borrowings		655
Consolidated liabilities, All other liabilities	179,174	67,459
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Others [Member]
Variable Interest Entity [Line Items]
Total assets	35,414	44,247
Consolidated assets, Cash and due from banks	364	361
Consolidated assets, Interest-earning deposits in other banks	1,313	14,236
Consolidated assets, Investment securities	40	42
Consolidated assets, Loans	11,139	12,963
Consolidated assets, All other assets	22,558	16,645
Total liabilities	34,070	43,030
Consolidated liabilities, Other short-term borrowings	9,997	24,747
Consolidated liabilities, Long-term debt	1,530	1,603
Consolidated liabilities, All other liabilities	22,543	16,680
Consolidated VIEs [Member] | Amounts Eliminated in Consolidation [Member]
Variable Interest Entity [Line Items]
Total assets	(7,264,990)	(7,223,156)
Consolidated assets, Cash and due from banks	(41,951)	(53,454)
Consolidated assets, Interest-earning deposits in other banks	(25,078)	(59,150)
Consolidated assets, Trading account assets	(7,351)	(3,804)
Consolidated assets, Investment securities	(75,838)	(88,758)
Consolidated assets, Loans	(7,063,476)	(6,996,317)
Consolidated assets, All other assets	(51,296)	(21,673)
Total liabilities	(14,996,741)	(15,347,991)
Consolidated liabilities, Deposits	(24,079)
Consolidated liabilities, Other short-term borrowings	(2,825,212)	(3,028,987)
Consolidated liabilities, Long-term debt	(12,026,663)	(12,248,680)
Consolidated liabilities, All other liabilities	(120,787)	(70,324)
Consolidated VIEs [Member] | Amount of Liabilities with Recourse to General Credit of MUFG Group [Member]
Variable Interest Entity [Line Items]
Total liabilities	(9,753,211)	(9,745,330)
Consolidated liabilities, Deposits	(7,116,099)	(7,103,738)
Consolidated liabilities, Other short-term borrowings	(2,045,306)	(2,162,890)
Consolidated liabilities, Long-term debt	(745)	(540)
Consolidated liabilities, All other liabilities	¥ (591,061)	¥ (478,162)

Variable Interest Entities (A_2

Variable Interest Entities (Assets and Liabilities of Non-consolidated Variable Interest Entities) (Detail) - Non-consolidated VIEs [Member] - JPY (¥) ¥ in Millions	Sep. 30, 2018	Mar. 31, 2018
Variable Interest Entity [Line Items]
Total assets	¥ 208,890,811	¥ 169,334,856
Maximum exposure	19,447,228	17,851,986
On-balance sheet assets, Total assets	15,857,141	14,592,351
On-balance sheet assets, Trading account assets	1,507,606	1,378,375
On-balance sheet assets, Investment securities	4,756,994	4,032,522
On-balance sheet assets, Loans	9,418,165	8,933,460
On-balance sheet assets, All other assets	174,376	247,994
On-balance sheet liabilities, Total liabilities	36,767	49,966
On-balance sheet liabilities, All other liabilities	36,767	49,966
Asset-backed Conduits [Member]
Variable Interest Entity [Line Items]
Total assets	31,417,028	29,011,749
Maximum exposure	6,192,648	5,721,627
On-balance sheet assets, Total assets	4,901,268	4,645,697
On-balance sheet assets, Trading account assets	284	620
On-balance sheet assets, Investment securities	1,591,198	1,541,591
On-balance sheet assets, Loans	3,309,786	3,103,486
Investment Funds [Member]
Variable Interest Entity [Line Items]
Total assets	52,638,790	45,090,381
Maximum exposure	2,061,803	1,776,366
On-balance sheet assets, Total assets	1,873,732	1,525,127
On-balance sheet assets, Trading account assets	456,304	213,722
On-balance sheet assets, Investment securities	1,115,847	891,062
On-balance sheet assets, Loans	293,763	413,855
On-balance sheet assets, All other assets	7,818	6,488
On-balance sheet liabilities, Total liabilities	551	17,919
On-balance sheet liabilities, All other liabilities	551	17,919
Special Purpose Entities Created for Structured Financing [Member]
Variable Interest Entity [Line Items]
Total assets	41,827,348	35,437,349
Maximum exposure	4,278,002	4,016,999
On-balance sheet assets, Total assets	3,326,807	3,193,621
On-balance sheet assets, Trading account assets	215,302	309,560
On-balance sheet assets, Investment securities	95,901	116,961
On-balance sheet assets, Loans	3,015,060	2,697,126
On-balance sheet assets, All other assets	544	69,974
On-balance sheet liabilities, Total liabilities	12,971	7,217
On-balance sheet liabilities, All other liabilities	12,971	7,217
Repackaged Instruments [Member]
Variable Interest Entity [Line Items]
Total assets	11,133,879	10,212,933
Maximum exposure	2,973,296	2,576,619
On-balance sheet assets, Total assets	2,894,459	2,487,377
On-balance sheet assets, Trading account assets	705,482	759,591
On-balance sheet assets, Investment securities	1,896,859	1,421,716
On-balance sheet assets, Loans	225,887	236,852
On-balance sheet assets, All other assets	66,231	69,218
Others [Member]
Variable Interest Entity [Line Items]
Total assets	71,873,766	49,582,444
Maximum exposure	3,941,479	3,760,375
On-balance sheet assets, Total assets	2,860,875	2,740,529
On-balance sheet assets, Trading account assets	130,234	94,882
On-balance sheet assets, Investment securities	57,189	61,192
On-balance sheet assets, Loans	2,573,669	2,482,141
On-balance sheet assets, All other assets	99,783	102,314
On-balance sheet liabilities, Total liabilities	23,245	24,830
On-balance sheet liabilities, All other liabilities	¥ 23,245	¥ 24,830

Fees and Commissions Income - A

Fees and Commissions Income - Additional Information (Detail) ¥ in Billions	Sep. 30, 2018JPY (¥)
Fees and Commissions Income [Abstract]
Receivables from contracts with customer included primarily in Other assets	¥ 194
Contract liabilities included primarily in Other liabilities	¥ 6

Fees and Commissions Income (De

Fees and Commissions Income (Details of Fees and Commissions Income) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		¥ 705,438	¥ 701,916
Deposits [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		26,568	27,100
Remittances and Transfers [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		84,342	82,896
Foreign Trading Business [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		35,453	37,002
Credit card business [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		110,223	102,992
Security-related Services [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		119,007	127,151
Administration and management services for investment funds [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		74,928	80,643
Trust fees [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		57,459	55,086
Guarantee fees [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income	[1]	22,205	21,609
Insurance Commissions [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		23,469	25,302
Real Estate Business [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		17,878	18,140
Others [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income	[2]	¥ 133,906	¥ 123,995
[1]	Guarantee fees are not within the scope of the guidance on revenue from contracts with customers
[2]	Other fees and commissions include non-refundable financing related fees that are not within the scope of the guidance on revenue from contracts with customers.

Business Segments (Financial In

Business Segments (Financial Information by Business Segment) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Business segment information
Net revenue	[1]	¥ 1,934,200	¥ 2,037,200
Net interest income		1,133,053	1,120,246
Operating expenses	[1]	1,363,700	1,360,200
Operating profit (loss)	[1]	570,500	677,000
Modification Impact [Member] | Internal Management Accounting Rules And Practices [Member]
Business segment information
Operating profit (loss)			(11,800)
BK and TB [Member]
Business segment information
Net revenue	[1],[2]	1,015,300	1,109,600
Net interest income	[1]	659,200	592,400
Net fees	[1]	301,400	318,100
Other	[1]	54,700	199,100
Other than BK and TB [Member]
Business segment information
Net revenue	[1]	918,900	927,600
Business Segment [Member] | Customer Business [Member]
Business segment information
Net revenue		1,663,800	1,622,000
Operating expenses		1,177,200	1,167,000
Operating profit (loss)		486,600	455,000
Business Segment [Member] | Customer Business [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	751,600	761,900
Net interest income		365,700	358,900
Net fees		341,600	362,300
Other		44,300	40,700
Business Segment [Member] | Customer Business [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		912,200	860,100
Business Segment [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member]
Business segment information
Net revenue		754,500	766,900
Operating expenses		608,800	609,500
Operating profit (loss)		145,700	157,400
Business Segment [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	363,300	382,900
Net interest income		233,100	234,000
Net fees		115,400	133,600
Other		14,800	15,300
Business Segment [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		391,200	384,000
Business Segment [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member]
Business segment information
Net revenue		260,500	252,200
Operating expenses		144,900	148,800
Operating profit (loss)		115,600	103,400
Business Segment [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	203,700	214,100
Net interest income		75,600	77,800
Net fees		98,900	109,000
Other		29,200	27,300
Business Segment [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		56,800	38,100
Business Segment [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member]
Business segment information
Net revenue		200,600	195,300
Operating expenses		123,400	122,600
Operating profit (loss)		77,200	72,700
Business Segment [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	136,500	124,700
Net interest income		57,900	48,600
Net fees		78,300	78,000
Other		300	(1,900)
Business Segment [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		64,100	70,600
Business Segment [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member]
Business segment information
Net revenue		343,800	314,500
Operating expenses		239,500	227,400
Operating profit (loss)		104,300	87,100
Business Segment [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	(900)	(1,500)
Net interest income		(900)	(1,500)
Business Segment [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		344,700	316,000
Business Segment [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member]
Business segment information
Net revenue		104,400	93,100
Operating expenses		60,600	58,700
Operating profit (loss)		43,800	34,400
Business Segment [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	49,000	41,700
Net fees		49,000	41,700
Business Segment [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		55,400	51,400
Business Segment [Member] | Global Markets Business Group [Member]
Business segment information
Net revenue		258,300	373,900
Operating expenses		113,100	113,900
Operating profit (loss)		145,200	260,000
Business Segment [Member] | Global Markets Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	166,200	278,400
Net interest income		103,700	121,900
Net fees		(9,100)	(9,300)
Other		71,600	165,800
Business Segment [Member] | Global Markets Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		92,100	95,500
Business Segment, Other [Member]
Business segment information
Net revenue		12,100	41,300
Operating expenses		73,400	79,300
Operating profit (loss)		(61,300)	(38,000)
Business Segment, Other [Member] | BK and TB [Member]
Business segment information
Net revenue	[2]	97,500	69,300
Net interest income		189,800	111,600
Net fees		(31,100)	(34,900)
Other		(61,200)	(7,400)
Business Segment, Other [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		¥ (85,400)	¥ (28,000)
[1]	Prior period business segment information has been restated to reflect the transfer of corporate loan-related businesses of Mitsubishi UFJ Trust and Banking to MUFG Bank. In accordance with internal management accounting rules and practices, the transfer resulted in a decrease of the total operating profit by ¥11.8 billion for the six months ended September 30, 2017.
[2]	"BK and TB" is a sum of MUFG Bank on a stand-alone basis and Mitsubishi UFJ Trust and Banking on a stand-alone basis.

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, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	[1]	¥ 570,500	¥ 677,000
Reversal of credit losses		71,060	186,568	[2]
Foreign exchange gains (losses)-net		(99,407)	(3,025)
Trading account losses-net		(332,431)	69,428
Equity in earnings of equity method investees-net		140,014	88,717	[2]
Income before income tax expense		695,767	1,014,434
Reconciliation [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit		571,000	677,000
Reversal of credit losses		71,000	187,000
Foreign exchange gains (losses)-net		(43,000)	23,000
Trading account losses-net		(330,000)	(50,000)
Equity investment securities gains-net		391,000	95,000
Debt investment securities gains (losses)-net		14,000	(5,000)
Equity in earnings of equity method investees-net		140,000	89,000
Provision for off-balance sheet credit instruments		(42,000)	(1,000)
Other-net		(76,000)	(1,000)
Income before income tax expense		¥ 696,000	¥ 1,014,000
[1]	Prior period business segment information has been restated to reflect the transfer of corporate loan-related businesses of Mitsubishi UFJ Trust and Banking to MUFG Bank. In accordance with internal management accounting rules and practices, the transfer resulted in a decrease of the total operating profit by ¥11.8 billion for the six months ended September 30, 2017.
[2]	The MUFG Group early adopted new guidance on restricted cash retrospectively in the second half of the fiscal year ended March 31, 2018, and amounts for the six months ended September 30, 2017 were revised. See Note 1 Accounting Changes for further information. In addition, the reclassification of certain items on the condensed balance sheets resulted in reclassification of the condensed consolidated statements of cash flows for the six months ended September 30, 2017. See Note 1 Reclassifications for further information.

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, 2018		Mar. 31, 2018
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	¥ 11,661,000		¥ 12,585,000
Investment securities, Available-for-sale debt securities		31,162,510		32,833,114
Equity securities		7,605,948		7,238,194
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	11,665,000		11,877,000
Obligation to return securities received as collateral		3,427,158		3,176,962
Interest Rate Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	7,808,000		8,712,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	7,916,000		8,691,000
Foreign Exchange Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	3,538,000		3,557,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	3,496,000		3,000,000
Equity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	219,000		207,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	268,000		227,000
Commodity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	31,000		35,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	30,000		33,000
Credit Derivatives [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	63,000		72,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	72,000		71,000
Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		22,831,889		24,567,904
Japanese Prefectural and Municipal Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,776,267		1,537,431
Foreign Governments and Official Institutions Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		2,197,455		2,171,692
Corporate Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,110,138		1,119,360
Residential Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,495,749		1,617,535
Commercial Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		106,620		95,236
Asset-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,496,333		1,558,349
Other Debt Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		148,059	[4]	165,607	[5]
Fair Value, Measurements, Recurring [Member]
Assets:
Trading account assets, Trading securities	[6]	24,396,492		22,579,997
Trading account assets, Trading derivative assets		11,660,832		12,585,175
Investment securities, Available-for-sale debt securities		31,162,510		32,833,114
Equity securities	[7]	7,049,409		6,699,943
Others	[8],[9]	991,498		1,057,250
Assets at fair value, Total		75,260,741		75,755,479
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		43,667		215,414
Trading account liabilities, Trading derivative liabilities		11,782,312		12,006,917
Obligation to return securities received as collateral		3,427,158		3,176,962
Others	[10]	491,584		482,172
Liabilities at fair value, Total		15,744,721		15,881,465
Fair Value, Measurements, Recurring [Member] | Private Equity Funds [Member]
Assets:
Investments valued at net asset value		5		35
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities	[6]	11,165,761		10,876,424
Trading account assets, Trading derivative assets		81,056		71,175
Investment securities, Available-for-sale debt securities		21,343,577		23,105,682
Equity securities	[7]	6,503,595		6,255,413
Others	[8],[9]	923,764		955,548
Assets at fair value, Total		40,017,753		41,264,242
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		28,947		208,354
Trading account liabilities, Trading derivative liabilities		130,816		80,673
Obligation to return securities received as collateral		3,259,898		3,030,974
Liabilities at fair value, Total		3,419,661		3,320,001
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities	[6]	12,454,327		10,876,080
Trading account assets, Trading derivative assets		11,504,535		12,420,100
Investment securities, Available-for-sale debt securities		9,520,671		9,376,772
Equity securities	[7]	517,401		416,171
Others	[8],[9]	49,712		93,042
Assets at fair value, Total		34,046,646		33,182,165
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		14,720		7,060
Trading account liabilities, Trading derivative liabilities		11,589,654		11,844,463
Obligation to return securities received as collateral		167,260		145,988
Others	[10]	486,579		507,700
Liabilities at fair value, Total		12,258,213		12,505,211
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities	[6]	776,404		827,493
Trading account assets, Trading derivative assets		75,241		93,900
Investment securities, Available-for-sale debt securities		298,262		350,660
Equity securities	[7]	28,413		28,359
Others	[8],[9]	18,022		8,660
Assets at fair value, Total		1,196,342		1,309,072
Liabilities:
Trading account liabilities, Trading derivative liabilities		61,842		81,781
Others	[10]	5,005		(25,528)
Liabilities at fair value, Total		66,847		56,253
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		7,807,221		8,711,839
Liabilities:
Trading account liabilities, Trading derivative liabilities		7,916,199		8,674,623
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		13,761		3,320
Liabilities:
Trading account liabilities, Trading derivative liabilities		14,316		3,085
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		7,776,462		8,681,427
Liabilities:
Trading account liabilities, Trading derivative liabilities		7,881,739		8,659,042
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		16,998		27,092
Liabilities:
Trading account liabilities, Trading derivative liabilities		20,144		12,496
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		3,537,943		3,557,421
Liabilities:
Trading account liabilities, Trading derivative liabilities		3,495,824		3,000,252
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		3,621		1,890
Liabilities:
Trading account liabilities, Trading derivative liabilities		2,060		2,058
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		3,517,345		3,543,413
Liabilities:
Trading account liabilities, Trading derivative liabilities		3,489,349		2,992,812
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		16,977		12,118
Liabilities:
Trading account liabilities, Trading derivative liabilities		4,415		5,382
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		219,350		207,310
Liabilities:
Trading account liabilities, Trading derivative liabilities		267,583		226,781
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		63,674		65,965
Liabilities:
Trading account liabilities, Trading derivative liabilities		114,440		75,530
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		143,420		118,351
Liabilities:
Trading account liabilities, Trading derivative liabilities		142,932		117,572
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		12,256		22,994
Liabilities:
Trading account liabilities, Trading derivative liabilities		10,211		33,679
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		32,860		36,992
Liabilities:
Trading account liabilities, Trading derivative liabilities		30,805		34,432
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		4,842		6,239
Liabilities:
Trading account liabilities, Trading derivative liabilities		3,858		4,362
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		28,018		30,753
Liabilities:
Trading account liabilities, Trading derivative liabilities		26,947		30,070
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member]
Assets:
Trading account assets, Trading derivative assets		63,458		71,613
Liabilities:
Trading account liabilities, Trading derivative liabilities		71,901		70,829
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		62,466		70,670
Liabilities:
Trading account liabilities, Trading derivative liabilities		71,776		70,675
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		992		943
Liabilities:
Trading account liabilities, Trading derivative liabilities		125		154
Fair Value, Measurements, Recurring [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		22,831,889		24,567,904
Fair Value, Measurements, Recurring [Member] | Japanese National Government and Japanese Government Agency Bonds [Member] | Level 1 [Member]
Assets:
Investment securities, Available-for-sale debt securities		19,682,038		21,522,128
Fair Value, Measurements, Recurring [Member] | Japanese National Government and Japanese Government Agency Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		3,149,851		3,045,776
Fair Value, Measurements, Recurring [Member] | Japanese Prefectural and Municipal Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,776,267		1,537,431
Fair Value, Measurements, Recurring [Member] | Japanese Prefectural and Municipal Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,776,267		1,537,431
Fair Value, Measurements, Recurring [Member] | Foreign Governments and Official Institutions Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		2,197,455		2,171,692
Fair Value, Measurements, Recurring [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 1 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,661,539		1,583,554
Fair Value, Measurements, Recurring [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		516,971		567,946
Fair Value, Measurements, Recurring [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		18,945		20,192
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,110,138		1,119,360
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,107,735		1,113,323
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		2,403		6,037
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,495,749		1,617,535
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,495,734		1,617,520
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		15		15
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		106,620		95,236
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		104,327		92,806
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		2,293		2,430
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,496,333		1,558,349
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,365,717		1,397,177
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		130,616		161,172
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		148,059		165,607
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		4,069		4,793
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		143,990		160,814
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member]
Assets:
Equity securities		7,020,996		6,671,584
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] | Level 1 [Member]
Assets:
Equity securities		6,503,595		6,255,413
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] | Level 2 [Member]
Assets:
Equity securities		517,401		416,171
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member]
Assets:
Equity securities		28,413	[11]	28,359
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member] | Real Estate Funds [Member]
Assets:
Investments valued at net asset value		14,578
Unfunded commitments		7,395
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member] | Level 3 [Member]
Assets:
Equity securities		28,413	[11]	28,359
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Trading account assets, Trading securities		2,824,536		1,865,673
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		2,395,839		1,388,143
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		428,697		477,530
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Assets:
Trading account assets, Trading securities		82,105		189,756
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		82,105		189,756
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Assets:
Trading account assets, Trading securities		7,570,306		8,661,170
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities		7,096,467		8,190,781
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		472,704		469,342
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		1,135		1,047
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Assets:
Trading account assets, Trading securities		3,550,333		3,278,595
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		3,537,933		3,255,503
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		12,400		23,092
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Assets:
Trading account assets, Trading securities		5,085,442		4,473,448
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		5,046,706		4,432,307
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		38,736		41,141
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member]
Assets:
Trading account assets, Trading securities		959,071		870,988
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		332,137		186,351
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		626,934		684,637
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member]
Assets:
Trading account assets, Trading securities		36,673		36,250
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		877		2,800
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		35,796		33,450
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Paper [Member]
Assets:
Trading account assets, Trading securities		1,628,906		1,210,775
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Paper [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		1,628,906		1,210,775
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Trading account assets, Trading securities	[12]	2,659,120		1,993,342
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Private Equity Funds [Member]
Assets:
Investments valued at net asset value		30,195		21,517
Unfunded commitments		88,173		61,463
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities	[12]	1,673,455		1,297,500
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities	[12]	924,262		651,716
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities	[12]	¥ 61,403		¥ 44,126
[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, 2018.
[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 ¥135,688 million of private placement debt conduit bonds.
[5]	Other debt securities in the table above include ¥152,374 million of private placement debt conduit bonds.
[6]	Includes securities measured under the fair value option.
[7]	The table above reflects changes in presentation that were made to equity investment securities at March 31, 2018. See Note 1 for further information.
[8]	Excludes certain investments valued at net asset value of private equity funds, whose fair values at March 31, 2018 was ¥35 million, and those at September 30, 2018 was ¥5 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, 2018.
[9]	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.
[10]	Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments.
[11]	Excludes certain investments valued at net asset value of real estate funds whose fair values at September 30, 2018 were ¥14,578 million. The amounts of unfunded commitments related to these real estate funds at September 30, 2018 were ¥7,395 million. For the nature and details of real estate funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2018.
[12]	Excludes certain investments valued at net asset value of private equity funds whose fair values at March 31, 2018 were ¥21,517 million, and those at September 30, 2018 were ¥30,195 million, respectively. The amounts of unfunded commitments related to these private equity funds at March 31, 2018 were ¥61,463 million, and those at September 30, 2018 were ¥88,173 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, 2018.

Fair Value (Transfers between L

Fair Value (Transfers between Level 1 and Level 2) (Detail) - Fair Value, Measurements, Recurring [Member] - Marketable Equity Securities [Member] - JPY (¥) ¥ in Millions		Sep. 30, 2018	Sep. 30, 2017
Assets, Investment securities, Equity securities:
Transfers out of Level 1 into Level 2, Assets	[1]	¥ 7,261	¥ 1,981
Transfers out of Level 2 into Level 1, Assets	[1]	¥ 8,122	¥ 3,839
[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, 2018		Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		¥ 1,227,291		¥ 1,204,406
Total gains (losses) for the period included in earnings, Assets		52,777		26,675
Total gains (losses) for the period included in other comprehensive income, Assets		(9,623)		(10,693)
Purchases, Assets		417,649		667,588
Issues, Assets		(429)		(1,385)
Sales, Assets		(178,314)		(129,415)
Settlements, Assets		(396,550)		(372,510)
Transfers into Level 3, Assets	[1]	28,556		22,326
Transfers out of Level 3, Assets	[1]	(6,857)		(43,666)
Level 3 assets, Ending balance		1,134,500		1,363,326
Change in unrealized gains (losses) included in earnings for assets still held at period end		31,963		27,630
Level 3 liabilities, Beginning balance		(25,528)		28,432
Total gains (losses) for the period included in earnings, Liabilities		(5,160)		(24,919)
Total gains (losses) for the period included in other comprehensive income, Liabilities		2,262		(595)
Purchases, Liabilities
Issues, Liabilities		848		4,243
Sales, Liabilities
Settlements, Liabilities		(11,902)		(13,055)
Transfers into Level 3, Liabilities	[1]	14,454		1,888
Transfers out of Level 3, Liabilities	[1]	24,235		(15,407)
Level 3 liabilities, Ending balance		5,005		31,615
Change in unrealized gains (losses) included in earnings for liabilities still held at period end		(1,049)		(18,694)
Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 liabilities, Beginning balance		(25,528)		28,432
Total gains (losses) for the period included in earnings, Liabilities	[2]	(5,160)		(24,919)
Total gains (losses) for the period included in other comprehensive income, Liabilities		2,262		(595)
Issues, Liabilities		848		4,243
Settlements, Liabilities		(11,902)		(13,055)
Transfers into Level 3, Liabilities	[1]	14,454		1,888
Transfers out of Level 3, Liabilities	[1]	24,235		(15,407)
Level 3 liabilities, Ending balance		5,005		31,615
Change in unrealized gains (losses) included in earnings for liabilities still held at period end	[2]	(1,049)		(18,694)
Trading Account Assets, Trading Securities, Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance	[3]	827,493		799,493
Total gains (losses) for the period included in earnings, Assets	[3],[4]	42,948		18,075
Purchases, Assets	[3]	274,937		522,384
Sales, Assets	[3]	(177,306)		(128,188)
Settlements, Assets	[3]	(181,133)		(240,479)
Transfers into Level 3, Assets	[1],[3]	4,532		20,416
Transfers out of Level 3, Assets	[1],[3]	(15,067)		(10,571)
Level 3 assets, Ending balance	[3]	776,404		981,130
Change in unrealized gains (losses) included in earnings for assets still held at period end	[3],[4]	40,167		18,905
Trading Account Assets, Trading Securities, 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)
Purchases, Assets				1,079
Level 3 assets, Ending balance				1,075
Change in unrealized gains (losses) included in earnings for assets still held at period end				(4)
Trading Account Assets, Trading Securities, 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		1,047		1,836
Total gains (losses) for the period included in earnings, Assets		214		341
Purchases, Assets		40,600		37,112
Sales, Assets		(40,710)		(37,369)
Settlements, Assets		(16)		(47)
Transfers out of Level 3, Assets	[1]			(973)
Level 3 assets, Ending balance		1,135		900
Change in unrealized gains (losses) included in earnings for assets still held at period end		6		69
Trading Account Assets, Trading Securities, Debt Securities [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		23,092		25,521
Total gains (losses) for the period included in earnings, Assets		682		(1,979)
Purchases, Assets		729		3,170
Sales, Assets		(193)		(533)
Settlements, Assets		(1,375)		(3,347)
Transfers into Level 3, Assets	[1],[5]	4,532		20,317
Transfers out of Level 3, Assets	[1],[5]	(15,067)		(9,598)
Level 3 assets, Ending balance		12,400		33,551
Change in unrealized gains (losses) included in earnings for assets still held at period end		642		(1,957)
Trading Account Assets, Trading Securities, Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		41,141		47,914
Total gains (losses) for the period included in earnings, Assets		667		2,344
Settlements, Assets		(3,072)		(4,044)
Level 3 assets, Ending balance		38,736		46,214
Change in unrealized gains (losses) included in earnings for assets still held at period end		636		2,306
Trading Account Assets, Trading Securities, Debt Securities [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		684,637		654,814
Total gains (losses) for the period included in earnings, Assets		38,155		16,454
Purchases, Assets		216,109		476,136
Sales, Assets		(136,388)		(88,454)
Settlements, Assets		(175,579)		(232,251)
Level 3 assets, Ending balance		626,934		826,699
Change in unrealized gains (losses) included in earnings for assets still held at period end		36,181		18,037
Trading Account Assets, Trading Securities, Debt Securities [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		33,450		35,552
Total gains (losses) for the period included in earnings, Assets		2,346		78
Level 3 assets, Ending balance		35,796		35,630
Change in unrealized gains (losses) included in earnings for assets still held at period end		2,346		79
Trading Account Assets, Trading Securities, Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		44,126		33,856
Total gains (losses) for the period included in earnings, Assets		884		841
Purchases, Assets		17,499		4,887
Sales, Assets		(15)		(1,832)
Settlements, Assets		(1,091)		(790)
Transfers into Level 3, Assets	[1]			99
Level 3 assets, Ending balance		61,403		37,061
Change in unrealized gains (losses) included in earnings for assets still held at period end		356		375
Trading Account Assets, Trading Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		12,119		37,245
Total gains (losses) for the period included in earnings, Assets	[4]	3,739		7,470
Total gains (losses) for the period included in other comprehensive income, Assets		(545)		133
Purchases, Assets		582		568
Issues, Assets		(429)		(1,385)
Settlements, Assets		(34,413)		(13,829)
Transfers into Level 3, Assets	[1]	23,922		1,817
Transfers out of Level 3, Assets	[1]	8,424		(2,453)
Level 3 assets, Ending balance		13,399		29,566
Change in unrealized gains (losses) included in earnings for assets still held at period end	[4]	(7,391)		10,436
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		14,596		28,551
Total gains (losses) for the period included in earnings, Assets		2,127		(303)
Total gains (losses) for the period included in other comprehensive income, Assets		(134)		(93)
Issues, Assets		(94)
Settlements, Assets		(18,154)		(6,231)
Transfers into Level 3, Assets	[1]	311		(3,399)
Transfers out of Level 3, Assets	[1]	(1,798)		402
Level 3 assets, Ending balance		(3,146)		18,927
Change in unrealized gains (losses) included in earnings for assets still held at period end		2,256		400
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		6,736		14,858
Total gains (losses) for the period included in earnings, Assets		(12,064)		(5,533)
Total gains (losses) for the period included in other comprehensive income, Assets		(262)		115
Purchases, Assets		18		235
Issues, Assets				(228)
Settlements, Assets		(2,614)		189
Transfers into Level 3, Assets	[1]	23,611	[5]	5,216
Transfers out of Level 3, Assets	[1]	(2,863)		(3,461)
Level 3 assets, Ending balance		12,562		11,391
Change in unrealized gains (losses) included in earnings for assets still held at period end		(11,544)		(2,516)
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		(10,685)		(6,312)
Total gains (losses) for the period included in earnings, Assets		13,488		13,082
Total gains (losses) for the period included in other comprehensive income, Assets		(153)		112
Purchases, Assets				332
Issues, Assets				(794)
Settlements, Assets		(13,690)		(7,887)
Transfers out of Level 3, Assets	[1]	13,085	[5]	606
Level 3 assets, Ending balance		2,045		(861)
Change in unrealized gains (losses) included in earnings for assets still held at period end		964		11,710
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		683		370
Total gains (losses) for the period included in earnings, Assets		156		261
Total gains (losses) for the period included in other comprehensive income, Assets		4		(1)
Purchases, Assets		564		1
Issues, Assets		(335)		(363)
Settlements, Assets		(1)		55
Level 3 assets, Ending balance		1,071		323
Change in unrealized gains (losses) included in earnings for assets still held at period end		900		880
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		789		(222)
Total gains (losses) for the period included in earnings, Assets		32		(37)
Settlements, Assets		46		45
Level 3 assets, Ending balance		867		(214)
Change in unrealized gains (losses) included in earnings for assets still held at period end		33		(38)
Investment Securities, Available-for-sale Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		350,660		337,526
Total gains (losses) for the period included in earnings, Assets	[6]	6,323		2,053
Total gains (losses) for the period included in other comprehensive income, Assets		(9,056)		(10,705)
Purchases, Assets		131,326		139,993
Sales, Assets				(30)
Settlements, Assets		(181,004)		(118,202)
Transfers into Level 3, Assets	[1]	102		93
Transfers out of Level 3, Assets	[1]	(89)		(30,390)
Level 3 assets, Ending balance		298,262		320,338
Change in unrealized gains (losses) included in earnings for assets still held at period end	[6]	(83)		(69)
Investment Securities, Available-for-sale 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		20,192		20,099
Total gains (losses) for the period included in other comprehensive income, Assets		(1,002)		(184)
Purchases, Assets		242		248
Settlements, Assets		(487)		(54)
Level 3 assets, Ending balance		18,945		20,109
Investment Securities, Available-for-sale Debt Securities [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		6,037		36,932
Total gains (losses) for the period included in earnings, Assets		4		115
Total gains (losses) for the period included in other comprehensive income, Assets		(3)		(17)
Purchases, Assets		1,670		521
Sales, Assets				(30)
Settlements, Assets		(5,318)		(446)
Transfers into Level 3, Assets	[1]	102		93	[5]
Transfers out of Level 3, Assets	[1]	(89)		(30,390)	[5]
Level 3 assets, Ending balance		2,403		6,778
Change in unrealized gains (losses) included in earnings for assets still held at period end		(83)		(69)
Investment Securities, Available-for-sale 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 Debt Securities [Member] | Commercial Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		2,430		2,971
Total gains (losses) for the period included in other comprehensive income, Assets		(104)		(49)
Settlements, Assets		(33)		(38)
Level 3 assets, Ending balance		2,293		2,884
Investment Securities, Available-for-sale Debt Securities [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		161,172		116,919
Total gains (losses) for the period included in earnings, Assets		6,319		1,938
Total gains (losses) for the period included in other comprehensive income, Assets		(2,806)		(4,971)
Purchases, Assets		129,400		139,224
Settlements, Assets		(163,469)		(115,699)
Level 3 assets, Ending balance		130,616		137,411
Investment Securities, Available-for-sale Debt Securities [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		160,814		160,590
Total gains (losses) for the period included in other comprehensive income, Assets		(5,141)		(5,484)
Purchases, Assets		14
Settlements, Assets		(11,697)		(1,965)
Level 3 assets, Ending balance		143,990		153,141
Investment Securities, Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		28,359		26,292
Total gains (losses) for the period included in earnings, Assets		(1,199)	[6]	(648)	[2]
Purchases, Assets		2,203		1,366
Sales, Assets		(825)		(1,194)
Transfers out of Level 3, Assets	[1]	(125)		(252)
Level 3 assets, Ending balance		28,413		25,564
Change in unrealized gains (losses) included in earnings for assets still held at period end		(1,602)	[6]	(1,280)	[2]
Investment Securities, Equity Securities [Member] | Nonmarketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		28,359		26,292
Total gains (losses) for the period included in earnings, Assets		(1,199)		(648)
Purchases, Assets		2,203		1,366
Sales, Assets		(825)		(1,194)
Transfers out of Level 3, Assets	[1]	(125)		(252)
Level 3 assets, Ending balance		28,413		25,564
Change in unrealized gains (losses) included in earnings for assets still held at period end		(1,602)		(1,280)
Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		8,660		3,850
Total gains (losses) for the period included in earnings, Assets		966	[7]	(275)	[2]
Total gains (losses) for the period included in other comprehensive income, Assets		(22)		(121)
Purchases, Assets		8,601		3,277
Sales, Assets		(183)		(3)
Level 3 assets, Ending balance		18,022		6,728
Change in unrealized gains (losses) included in earnings for assets still held at period end		¥ 872	[7]	¥ (362)	[2]
[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 (losses)-net.
[3]	Includes Trading securities measured under the fair value option.
[4]	Included in Trading account profits (losses)-net and in Foreign exchange losses-net.
[5]	Transfers into Level 3 for Foreign exchange contract were mainly caused by the valuation using certain unobservable input. Transfers into (out of) Level 3 for corporate bonds were mainly caused by the decrease (increase) in liquidity or the availability of the quoted prices provided by third-party venders and Equity contracts-net were mainly caused by the change of valuation model and the change cease using certain unobservable input.
[6]	Included in Investment securities gains-net.
[7]	Included in Other non-interest income.

Fair Value (Quantitative Inform

Fair Value (Quantitative Information about Level 3 Fair Value Measurements) (Detail) - Fair Value, Measurements, Recurring [Member] - Level 3 [Member] ¥ in Millions		Sep. 30, 2018JPY (¥)yr	Mar. 31, 2018JPY (¥)yr
Interest Rate Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Fair value	[1]	¥ (3,283)	¥ 14,460
Interest Rate Contracts [Member] | Option Model [Member] | Probability of Default [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0	0
Interest Rate Contracts [Member] | Option Model [Member] | Probability of Default [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.119	0.125
Interest Rate Contracts [Member] | Option Model [Member] | Correlation Between Interest Rates [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.314	0.341
Interest Rate Contracts [Member] | Option Model [Member] | Correlation Between Interest Rates [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.501	0.527
Interest Rate Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Foreign Exchange Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.230	0.197
Interest Rate Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Foreign Exchange Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.538	0.504
Interest Rate Contracts [Member] | Option Model [Member] | Recovery Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.410	0.410
Interest Rate Contracts [Member] | Option Model [Member] | Recovery Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.470	0.460
Interest Rate Contracts [Member] | Option Model [Member] | Volatility [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.136	0.134
Interest Rate Contracts [Member] | Option Model [Member] | Volatility [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.704	1
Interest Rate Contracts [Member] | Option Model [Member] | Probability of Prepayment [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		1	1
Foreign Exchange Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Fair value	[1]	¥ 12,580	¥ 6,779
Foreign Exchange Contracts [Member] | Option Model [Member] | Probability of Default [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0	0
Foreign Exchange Contracts [Member] | Option Model [Member] | Probability of Default [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.076	0.125
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Interest Rates [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.450	0.403
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Interest Rates [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.740	0.740
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Foreign Exchange Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.163	0.281
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Foreign Exchange Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.538	0.507
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Underlying Assets [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.850	0.850
Foreign Exchange Contracts [Member] | Option Model [Member] | Recovery Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.410	0.410
Foreign Exchange Contracts [Member] | Option Model [Member] | Recovery Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.470	0.460
Foreign Exchange Contracts [Member] | Option Model [Member] | Volatility [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.112	0.103
Foreign Exchange Contracts [Member] | Option Model [Member] | Volatility [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.172	0.162
Equity Contracts [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Fair value	[1]	¥ 6,410	¥ 6,528
Equity Contracts [Member] | Discounted Cash Flow [Member] | Term of Litigation [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs | yr		1.5	2
Equity Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Fair value	[1]	¥ (3,767)	¥ (16,600)
Equity Contracts [Member] | Option Model [Member] | Correlation Between Underlying Assets [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs			0.760
Equity Contracts [Member] | Option Model [Member] | Correlation Between Underlying Assets [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.760
Equity Contracts [Member] | Option Model [Member] | Correlation Between Underlying Assets [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.800
Equity Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Equity [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.416
Equity Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Equity [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs			0.371
Equity Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Equity [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs			0.390
Equity Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rate and Equity [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.070	0.070
Equity Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rate and Equity [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.654	0.652
Equity Contracts [Member] | Option Model [Member] | Correlation Between Equities [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.243	0.206
Equity Contracts [Member] | Option Model [Member] | Correlation Between Equities [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net, Significant unobservable inputs		0.859	0.817
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, Fair value	[1]	¥ 18,945	¥ 20,192
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Probability of Default [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0	0
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Probability of Default [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.004	0.004
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Probability of Default [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.003	0.002
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Recovery Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.600	0.600
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Recovery Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.700	0.700
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Recovery Rate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.666	0.667
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.100
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs			0.080
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs			0.100
Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.100	0.095
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, Fair value	[1]	¥ 79,186	¥ 110,536
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Probability of Default [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.012	0.012
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Probability of Default [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.053	0.053
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Probability of Default [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.050	0.045
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Recovery Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.600	0.600
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Recovery Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.760	0.760
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Recovery Rate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.669	0.663
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, Fair value	[1],[3]	¥ 626,934	¥ 684,586
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Asset Correlations [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.090	0.090
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Asset Correlations [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2],[3]	0.090	0.090
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Discount Factor [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.010	0.010
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Discount Factor [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2],[3]	0.010	0.010
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Prepayment Rate [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.280	0.372
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Prepayment Rate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2],[3]	0.280	0.372
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Probability of Default [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0	0
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Probability of Default [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.881	0.913
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Probability of Default [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2],[3],[4]
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Recovery Rate [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.676	0.653
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Recovery Rate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2],[3]	0.676	0.653
Other Debt Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Fair value	[1]	¥ 35,796	¥ 33,450
Other Debt Securities [Member] | Discounted Cash Flow [Member] | Liquidity Premium [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.010	0.005
Other Debt Securities [Member] | Discounted Cash Flow [Member] | Liquidity Premium [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.024	0.024
Other Debt Securities [Member] | Discounted Cash Flow [Member] | Liquidity Premium [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.013	0.008
Other Debt Securities [Member] | Return on Equity Method [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Fair value	[1]	¥ 135,688	¥ 149,759
Other Debt Securities [Member] | Return on Equity Method [Member] | Probability of Default [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0	0
Other Debt Securities [Member] | Return on Equity Method [Member] | Probability of Default [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.250	0.250
Other Debt Securities [Member] | Return on Equity Method [Member] | Probability of Default [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.003	0.003
Other Debt Securities [Member] | Return on Equity Method [Member] | Recovery Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.400	0.400
Other Debt Securities [Member] | Return on Equity Method [Member] | Recovery Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.900	0.900
Other Debt Securities [Member] | Return on Equity Method [Member] | Recovery Rate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.749	0.725
Other Debt Securities [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.080	0.080
Other Debt Securities [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs		0.100	0.100
Other Debt Securities [Member] | Return on Equity Method [Member] | Market-required Return on Capital [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[2]	0.095	0.097
[1]	The fair value as of March 31, 2018 and September 30, 2018 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, 2018.
[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, 2018.

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, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1],[2]	¥ 12,070	¥ 1,984
Loans		242,619	251,440
Loans, Loans held for sale		26,795	22,835
Loans, Collateral dependent loans		215,824	228,605
Premises and equipment		13,600	34,326
Intangible assets		416	9,402
Other assets		68,077	98,419
Other assets, Investments in equity method investees	[1]	62,996	92,223
Other assets, Other		5,081	6,196
Assets at fair value, Total		336,782	395,571
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		7,296	8,443
Unfunded commitments related to investment securities valued at net asset value		19	1,544
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans		3,575	3,458
Loans, Collateral dependent loans		3,575	3,458
Other assets			92,223
Other assets, Investments in equity method investees	[1]		92,223
Assets at fair value, Total		3,575	95,681
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1],[2]	9,619
Loans		10,385	8,329
Loans, Collateral dependent loans		10,385	8,329
Other assets		62,996
Other assets, Investments in equity method investees	[1]	62,996
Assets at fair value, Total		83,000	8,329
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1],[2]	2,451	1,984
Loans		228,659	239,653
Loans, Loans held for sale		26,795	22,835
Loans, Collateral dependent loans		201,864	216,818
Premises and equipment		13,600	34,326
Intangible assets		416	9,402
Other assets		5,081	6,196
Other assets, Other		5,081	6,196
Assets at fair value, Total		¥ 250,207	¥ 291,561
[1]	Excludes certain investments valued at net asset value of ¥8,443 million and ¥7,296 million at March 31, 2018 and September 30, 2018, respectively. The unfunded commitments related to these investments are ¥1,544 million and ¥19 million at March 31, 2018 and September 30, 2018, 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, 2018.
[2]	Includes certain nonmarketable equity securities that are measured at fair value on a nonrecurring basis, including impairment and observable price change for nonmarketable equity securities measured under the measurement alternative.

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, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	¥ 30,629	¥ 77,278
Investment Securities [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	(8,013)	284
Loans [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	23,727	25,781
Loans [Member] | Loans Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	3	249
Loans [Member] | Collateral Dependent Loans [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	23,724	25,532
Premises and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	3,552	6,227
Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	667	16,591
Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	10,696	28,395
Other Assets [Member] | Investments in Equity Method Investees [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	10,034	27,985
Other Assets [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	¥ 662	¥ 410

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, 2018	Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		¥ 481,527	¥ 551,579
Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		(157,359)	90,632
Foreign Exchange Gains (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		638,886	460,947
Financial Liabilities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		(7,937)	3,226
Financial Liabilities [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		(7,937)	3,226
Financial Liabilities [Member] | Other Short-term Borrowings [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	(1,446)	2,054
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]	(1,446)	2,054
Financial Liabilities [Member] | Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	(6,491)	1,172
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]	(6,491)	1,172
Financial Assets [Member] | Trading Account Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[2]	481,527	551,579
Financial Assets [Member] | Trading Account Securities [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[2]	(157,359)	90,632
Financial Assets [Member] | Trading Account Securities [Member] | Foreign Exchange Gains (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[2]	¥ 638,886	¥ 460,947
[1]	Change in value attributable to the instrument-specific credit risk related to those financial liabilities are not material.
[2]	Excludes Danamon's equity securities. See Note 2 for reference.

Fair Value (Differences between

Fair Value (Differences between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2018	Mar. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Remaining aggregate contractual amounts outstanding, Financial liabilities	¥ 378,216	¥ 347,002
Fair value, Financial liabilities	355,154	333,985
Fair value over (under) remaining aggregate contractual amounts outstanding, Financial liabilities	(23,062)	(13,017)
Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Remaining aggregate contractual amounts outstanding, Financial liabilities	378,216	347,002
Fair value, Financial liabilities	355,154	333,985
Fair value over (under) remaining aggregate contractual amounts outstanding, Financial liabilities	¥ (23,062)	¥ (13,017)

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, 2018	Mar. 31, 2018
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			¥ 437
Carrying amounts of investments in equity method investees		¥ 2,542	2,219
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		35,664	32,648
Interest-earning deposits in other banks		39,157	43,210
Call loans and funds sold		877	896
Receivables under resale agreements		11,266	5,726
Receivables under securities borrowing transactions		3,113	9,269
Investment securities		4,188	3,684	[1],[2]
Loans, net of allowance for credit losses	[3]	117,029	116,272
Other financial assets	[4]	6,954	7,000
Deposits, Non-interest-bearing		29,649	29,862
Deposits, Interest-bearing		163,249	165,831
Total deposits		192,898	195,693
Call money and funds purchased		2,344	2,453
Payables under repurchase agreements		25,604	18,135
Payables under securities lending transactions		1,900	8,170
Due to trust account		3,029	3,386
Other short-term borrowings		6,923	6,617
Long-term debt		27,622	26,861
Other financial liabilities		6,961	6,642
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		35,664	32,648
Interest-earning deposits in other banks		39,157	43,210
Call loans and funds sold		877	896
Receivables under resale agreements		11,266	5,726
Receivables under securities borrowing transactions		3,113	9,269
Investment securities		4,198	3,797	[1],[2]
Loans, net of allowance for credit losses	[3]	117,598	117,753
Other financial assets	[4]	6,954	7,000
Deposits, Non-interest-bearing		29,649	29,862
Deposits, Interest-bearing		163,248	165,825
Total deposits		192,897	195,687
Call money and funds purchased		2,344	2,453
Payables under repurchase agreements		25,604	18,135
Payables under securities lending transactions		1,900	8,170
Due to trust account		3,029	3,386
Other short-term borrowings		6,923	6,617
Long-term debt		27,589	26,919
Other financial liabilities		6,961	6,642
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		35,664	32,648
Investment securities		1,189	1,197	[1],[2]
Loans, net of allowance for credit losses	[3]	4	3
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest-earning deposits in other banks		39,157	43,210
Call loans and funds sold		877	896
Receivables under resale agreements		11,266	5,726
Receivables under securities borrowing transactions		3,113	9,269
Investment securities		1,131	1,051	[1],[2]
Loans, net of allowance for credit losses	[3]	284	330
Other financial assets	[4]	6,954	7,000
Deposits, Non-interest-bearing		29,649	29,862
Deposits, Interest-bearing		163,248	165,825
Total deposits		192,897	195,687
Call money and funds purchased		2,344	2,453
Payables under repurchase agreements		25,604	18,135
Payables under securities lending transactions		1,900	8,170
Due to trust account		3,029	3,386
Other short-term borrowings		6,923	6,617
Long-term debt		27,589	26,919
Other financial liabilities		6,961	6,642
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		1,878	1,549	[1],[2]
Loans, net of allowance for credit losses	[3]	¥ 117,310	¥ 117,420
[1]	Excludes cost-method investments of ¥437 billion at March 31, 2018, 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 at March 31, 2018. 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 ¥2,219 billion and ¥2,542 billion at March 31, 2018 and September 30, 2018, respectively.

Investments in Equity Method _3

Investments in Equity Method Investees (Summarized Operating Results of Morgan Stanley) (Detail) - Morgan Stanley [Member] - JPY (¥) ¥ in Billions	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Equity Method Investment, Summarized Financial Information, Income and Loss
Net revenues	¥ 2,258	¥ 2,077
Total non-interest expenses	1,601	1,508
Income from continuing operations before income taxes	657	569
Net income applicable to Morgan Stanley	¥ 502	¥ 393

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Detail) - Subsequent Event [Member] ¥ / shares in Units, ¥ in Millions, $ in Billions	Dec. 04, 2018JPY (¥)	Nov. 13, 2018JPY (¥)¥ / sharesshares	Oct. 31, 2018JPY (¥)	Oct. 31, 2018AUD ($)	Dec. 10, 2018JPY (¥)shares
Acquisition of Colonial First State Global Asset Management [Member]
Subsequent Event [Line Items]
Percentage of equity interest after acquisition			100.00%	100.00%
Approximate consideration for acquisition to be paid			¥ 328,000	$ 4
MUFG Capital Finance 7 Limited [Member] | Non-cumulative and Non-dilutive Perpetual Preferred Securities [Member]
Subsequent Event [Line Items]
Non-dilutive perpetual preferred securities redeemed	¥ 222,000
Redemption date	Jan. 25, 2019
Common Stock [Member]
Subsequent Event [Line Items]
Dividends payable, amount per share | ¥ / shares		¥ 11
Dividends payable, total amount		¥ 144,314
Dividends payable, date to be paid		Dec. 5, 2018
Dividends payable, date of record		Sep. 30, 2018
Number of own shares repurchased | shares					159,836,800
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		1.52%
Date of own shares to be cancelled		Jan. 22, 2019
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