Mitsubishi UFJ Financial (MUFG) 20-F 9 Jul 21 2021 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Mar. 31, 2021shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Entity Registrant Name	MITSUBISHI UFJ FINANCIAL GROUP, INC.
Entity Central Index Key	0000067088
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding	13,581,995,120
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity File Number	000-54189
Entity Incorporation, State or Country Code	M0
Entity Address, Address Line One	7-1, Marunouchi 2-chome
Entity Address, City or Town	Chiyoda-ku
Entity Address, Country	JP
Entity Address, Postal Zip Code	100-8330
Document Registration Statement	false
Document Accounting Standard	U.S. GAAP
ICFR Auditor Attestation Flag	true
Business Contact [Member]
Document Information [Line Items]
Entity Address, Address Line One	4-5, Marunouchi 1-chome
Entity Address, City or Town	Chiyoda-ku
Entity Address, Country	JP
Entity Address, Postal Zip Code	100-8212
Contact Personnel Name	Masahisa Takahashi
City Area Code	81-3
Local Phone Number	3240-8111
Common Stock [Member]
Document Information [Line Items]
Security 12(b) Title	Common stock, without par value
No Trading Symbol Flag	true
Security Exchange Name	NYSE
American Depositary Shares [Member]
Document Information [Line Items]
Security 12(b) Title	American depositary shares, each of which represents one share of common stock
Trading Symbol	MUFG
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
ASSETS
Cash and due from banks		¥ 49,977,480	¥ 33,283,032
Interest-earning deposits in other banks		53,346,721	45,266,680
Cash, due from banks and interest-earning deposits in other banks		103,324,201	78,549,712
Call loans and funds sold		1,256,075	1,168,515
Receivables under resale agreements (Note 15)		13,779,763	23,995,961
Receivables under securities borrowing transactions (Note 15)		3,369,903	3,443,959
Trading account assets (including assets pledged that secured parties are permitted to sell or repledge of ¥6,709,467 and ¥5,032,178 in 2020 and 2021) (including ¥20,964,024 and ¥18,231,238 measured at fair value under the fair value option in 2020 and 2021) (Notes 9, 15, 23 and 31)		44,444,379	47,504,058
Investment securities (Notes 3, 9 and 31):
Available-for-sale debt securities (including assets pledged that secured parties are permitted to sell or repledge of ¥4,490,360 and ¥2,877,061 in 2020 and 2021)		47,117,813	34,200,203
Held-to-maturity debt securities (including assets pledged that secured parties are permitted to sell or repledge of ¥56,411 and ¥105,029 in 2020 and 2021) (fair value of ¥4,177,894 and ¥3,939,143 in 2020 and 2021)		3,903,763	4,165,781
Equity securities (including assets pledged that secured parties are permitted to sell or repledge of ¥616 and ¥1,532 in 2020 and 2021) (including ¥4,850,376 and ¥5,866,846 in 2020 and 2021 measured at fair value)		6,222,920	5,385,258
Total investment securities		57,244,496	43,751,242
Loans, net of unearned income, unamortized premiums and deferred loan fees (including assets pledged that secured parties are permitted to sell or repledge of ¥648,437 and ¥204,488 in 2020 and 2021) (Notes 4 and 9)	[1]	115,718,863	118,186,739
Allowance for credit losses (Note 4)	[2]	(1,348,391)	(809,540)
Net loans		114,370,472	117,377,199
Premises and equipment—net (Notes 5 and 7)		874,992	929,529
Customers' acceptance liability		283,194	167,257
Intangible assets—net (Notes 2 and 6)		1,184,994	1,239,526
Goodwill (Notes 2 and 6)		370,852	517,626
Other assets (net of allowance for credit losses of ¥14,741 at March 31, 2021) (Notes 7, 8, 9, 13, 14 and 31)		13,321,304	13,108,699
Total assets		353,824,625	331,753,283
LIABILITIES AND EQUITY
Deposits (Notes 9 and 10): Domestic offices, Non-interest-bearing		32,287,997	28,091,421
Deposits (Notes 9 and 10): Domestic offices, Interest-bearing		141,908,498	126,485,629
Deposits (Notes 9 and 10): Overseas offices, Non-interest-bearing		6,233,108	5,290,262
Deposits (Notes 9 and 10): Overseas offices, Interest-bearing		48,777,333	44,087,216
Total deposits		229,206,936	203,954,528
Call money and funds purchased (Notes 9 and 11)		2,353,830	3,668,922
Payables under repurchase agreements (Notes 9, 15 and 16)		24,567,943	31,849,915
Payables under securities lending transactions (Notes 9, 15 and 16)		842,590	1,016,874
Due to trust account and other short-term borrowings (including ¥377,133 and ¥196,113 measured at fair value under the fair value option in 2020 and 2021) (Notes 9, 12 and 31)		18,079,554	19,433,229
Trading account liabilities (Notes 15, 23 and 31)		12,017,553	14,767,433
Bank acceptances outstanding		283,194	167,257
Other short-term borrowings		14,187,723	16,055,482
Long-term debt (including ¥304,067 and ¥402,823 measured at fair value under the fair value option in 2020 and 2021) (Notes 7, 9, 12 and 31)		35,157,651	27,926,763
Other liabilities (Notes 1, 7, 8, 9, 13, 14, 15, 16, 26 and 31)		15,070,820	13,223,846
Total liabilities		337,580,071	316,008,767
Commitments and contingent liabilities (Notes 24 and 26)
Mitsubishi UFJ Financial Group shareholders' equity:
Capital stock (Notes 17 and 18)—common stock authorized, 33,000,000,000 shares; common stock issued, 13,581,995,120 shares and 13,581,995,120 shares at March 31, 2020 and 2021, with no stated value		2,090,270	2,090,270
Capital surplus (Note 18)		5,533,761	5,533,520
Retained earnings (Notes 19 and 33)
Appropriated for legal reserve		239,571	239,571
Unappropriated retained earnings		8,589,900	8,079,530
Accumulated other comprehensive income, net of taxes (Note 20)		(289,481)	(420,417)
Treasury stock, at cost—741,772,308 common shares and 737,282,154 common shares at March 31, 2020 and 2021		(503,072)	(505,987)
Total Mitsubishi UFJ Financial Group shareholders' equity		15,660,949	15,016,487
Noncontrolling interests		583,605	728,029
Total equity		16,244,554	15,744,516
Total liabilities and equity		353,824,625	331,753,283
Consolidated VIEs [Member]
ASSETS
Cash and due from banks		2,698	846
Interest-earning deposits in other banks		30,422	30,047
Trading account assets (including assets pledged that secured parties are permitted to sell or repledge of ¥6,709,467 and ¥5,032,178 in 2020 and 2021) (including ¥20,964,024 and ¥18,231,238 measured at fair value under the fair value option in 2020 and 2021) (Notes 9, 15, 23 and 31)		959,001	695,069
Investment securities (Notes 3, 9 and 31):
Total investment securities		1,727,292	1,804,459
Net loans		15,247,928	16,072,595
All other assets		161,075	244,645
Total assets		18,128,416	18,847,661
LIABILITIES AND EQUITY
Total deposits
Other short-term borrowings		33,599	30,831
Long-term debt		457,763	465,352
All other liabilities		103,457	101,969
Total liabilities		¥ 594,819	¥ 598,152
[1]	The above table includes loans held for sale of ¥344,790 million and ¥353,095 million at March 31, 2020 and 2021, respectively.
[2]	New guidance on measurement of credit losses on financial instruments requires the allowance for credit losses to be measured using the current expected credit losses model from April 1, 2020. For additional information, refer to Note 1

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Statement of Financial Position [Abstract]
Trading account assets pledged that secured parties are permitted to sell or repledge	¥ 5,032,178	¥ 6,709,467
Trading account assets measured at fair value under fair value option	18,231,238	20,964,024
Available-for-sale debt securities pledged that secured parties are permitted to sell or repledge	2,877,061	4,490,360
Held-to-maturity debt securities pledged that secured parties are permitted to sell or repledge	105,029	56,411
Held-to-maturity debt securities, Fair value	3,939,143	4,177,894
Equity securities pledged that secured parties are permitted to sell or repledge	1,532	616
Equity securities measured at fair value	5,866,846	4,850,376
Loans, net of unearned income, unamortized premiums and deferred loan fees, pledged that secured parties are permitted to sell or repledge	204,488	648,437
Due to trust account and other short-term borrowings measured at fair value under fair value option	196,113	377,133
Long-term debt measured at fair value under fair value option	¥ 402,823	¥ 304,067
Common stock, authorized	33,000,000,000	33,000,000,000
Common stock, issued	13,581,995,120	13,581,995,120
Common stock, stated value	¥ 0	¥ 0
Treasury stock, shares	737,282,154	741,772,308
Allowance for credit losses	¥ 14,741

Consolidated Statements of Inco

Consolidated Statements of Income - JPY (¥) shares in Thousands, ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans, including fees (Note 4)		¥ 1,940,754	¥ 2,597,932	¥ 2,576,417
Deposits in other banks		56,555	167,267	183,327
Investment securities:
Interest		178,873	242,123	237,378
Dividends		119,387	172,382	160,825
Trading account assets		373,200	489,842	499,724
Call loans and funds sold		4,721	11,286	10,354
Receivables under resale agreements and securities borrowing transactions		78,506	246,311	145,354
Total		2,751,996	3,927,143	3,813,379
Interest expense:
Deposits		329,392	836,081	717,366
Call money and funds purchased		1,105	3,270	3,913
Payables under repurchase agreements and securities lending transactions		91,508	357,382	333,632
Due to trust account, other short-term borrowings and trading account liabilities		72,403	164,907	155,273
Long-term debt		253,494	322,704	307,797
Total		747,902	1,684,344	1,517,981
Net interest income		2,004,094	2,242,799	2,295,398
Provision for credit losses (Note 4)		484,210	321,713	34,330
Net interest income after provision for credit losses		1,519,884	1,921,086	2,261,068
Non-interest income:
Fees and commissions income (Note 27)		1,527,283	1,502,052	1,438,578
Foreign exchange gains (losses)—net (Note 28)		99,337	(281,790)	(95,987)
Trading account profits (losses)—net		(410,368)	765,373	168,900
Investment securities gains (losses)—net (Note 3)		1,458,264	(532,248)	(252,307)
Equity in earnings of equity method investees—net (Note 14)		355,730	282,712	209,732
Gains on sales of loans (Note 4)		17,926	9,956	22,663
Gain on remeasurement of previously held equity method investment (Note 2)			41,218
Other non-interest income		109,615	88,422	103,665
Total		3,157,787	1,875,695	1,595,244
Non-interest expense:
Salaries and employee benefits (Note 13)		1,253,461	1,242,563	1,175,405
Occupancy expenses—net (Notes 5 and 26)		178,107	182,917	179,780
Fees and commissions expenses		318,797	332,033	313,745
Outsourcing expenses, including data processing		298,777	303,632	275,052
Depreciation of premises and equipment (Note 5)		87,305	113,489	98,867
Amortization of intangible assets (Note 6)		250,106	237,328	235,083
Impairment of intangible assets (Note 6)		21,680	3,732	118,108
Insurance premiums, including deposit insurance		90,529	98,441	93,756
Communications		59,798	59,976	59,166
Taxes and public charges		97,783	100,198	95,358
Impairment of goodwill (Note 6)		147,564	383,810
Provision for (reversal of) off-balance sheet credit instruments		(56,749)	(62,279)	38,463
Other non-interest expenses (Notes 5 and 26)		322,171	367,721	302,687
Total		3,069,329	3,363,561	2,985,470
Income before income tax expense		1,608,342	433,220	870,842
Income tax expense (Note 8)		444,948	114,505	133,237
Net income before attribution of noncontrolling interests		1,163,394	318,715	737,605
Net income attributable to noncontrolling interests		46,096	12,760	18,960
Net income attributable to Mitsubishi UFJ Financial Group		1,117,298	305,955	718,645
Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group		¥ 1,117,298	¥ 305,955	¥ 718,645
Earnings per common share applicable to common shareholders of Mitsubishi UFJ Financial Group (Notes 19 and 22):
Basic earnings per common share—Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group		¥ 86.88	¥ 23.69	¥ 55.03
Diluted earnings per common share—Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group	[1]	86.56	23.47	54.74
Cash dividend per common share		¥ 25	¥ 23.50	¥ 21
Weighted average common shares outstanding		12,859,737	12,912,790	13,058,698
Weighted average diluted common shares outstanding		12,859,737	12,912,956	13,059,182
[1]	For the fiscal years ended March 31, 2019, 2020 and 2021, 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.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income before attribution of noncontrolling interests	¥ 1,163,394	¥ 318,715	¥ 737,605
Other comprehensive income (loss), net of tax (Note 20):
Net unrealized gains (losses) on investment securities	(70,776)	23,619	88,180
Net debt valuation adjustments	(83,364)	54,172	9,729
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges	32,175	10,642	(4,890)
Defined benefit plans (Note 13)	319,056	(131,523)	(88,940)
Foreign currency translation adjustments	(115,251)	(81,065)	(42,212)
Total	81,840	(124,155)	(38,133)
Comprehensive income	1,245,234	194,560	699,472
Net income attributable to noncontrolling interests	46,096	12,760	18,960
Other comprehensive income (loss) attributable to noncontrolling interests	(49,062)	11,993	21,209
Comprehensive income attributable to Mitsubishi UFJ Financial Group	¥ 1,248,200	¥ 169,807	¥ 659,303

Consolidated Statements of Equi

Consolidated Statements of Equity - 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]Unappropriated Retained Earnings [Member]Effect of adopting new guidance [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Accumulated Other Comprehensive Income (Loss), Net of Taxes [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Accumulated Other Comprehensive Income (Loss), Net of Taxes [Member]Effect of adopting new guidance [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Treasury Stock, at Cost [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member]Effect of adopting new guidance [Member]
Effect of adopting new guidance				¥ 2,090,270	¥ 5,740,165	¥ 239,571	¥ 4,945,733		¥ 2,477,315		¥ (522,872)	¥ 675,633
Balance at beginning of fiscal year at Mar. 31, 2018				2,090,270	5,740,165	239,571	4,945,733		2,477,315		(522,872)	675,633
Stock-based compensation					(180)
Net income attributable to Mitsubishi UFJ Financial Group		¥ 718,645					718,645
Common stock—¥21.00 per share in 2019, ¥23.50 per share in 2020, and ¥25.00 per share in 2021							(275,551)
Purchases of shares of treasury stock (Note 18)											(161,043)
Sales of shares of treasury stock											3,775
Retirement of common stock					(162,720)						162,720
Net decrease resulting from changes in interests in consolidated subsidiaries, consolidated VIEs, and affiliated companies											184
Initial subscriptions of noncontrolling interests												108,235
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders												(2,830)
Decrease in noncontrolling interests related to deconsolidation of subsidiaries												(20,497)
Net income attributable to noncontrolling interests		18,960										18,960
Dividends paid to noncontrolling interests												(15,853)
Net change during the fiscal year, Other comprehensive income (loss), net of taxes		(38,133)							(59,342)			21,209
Other—net					(79)							343
Balance at end of fiscal year at Mar. 31, 2019		15,984,748	¥ 15,199,548	2,090,270	5,577,186	239,571	8,094,026		(284,269)		(517,236)	785,200
Balance at end of fiscal year (Foreign Affiliated Company [Member]) at Mar. 31, 2019	[1]							¥ 1,173
Balance at end of fiscal year (Recognition and Measurement of Financial Assets and Financial Liabilities [Member]) at Mar. 31, 2019								2,702,242		¥ (2,702,242)
Balance at end of fiscal year (Recognition of Breakage for Certain Prepaid Stored-Value Products [Member]) at Mar. 31, 2019								1,784
Effect of adopting new guidance		15,984,748	15,199,548	2,090,270	5,577,186	239,571	8,094,026		(284,269)		(517,236)	785,200
Effect of adopting new guidance | Foreign Affiliated Company [Member]	[1]							1,173
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
Stock-based compensation					2,596
Net income attributable to Mitsubishi UFJ Financial Group		305,955					305,955
Common stock—¥21.00 per share in 2019, ¥23.50 per share in 2020, and ¥25.00 per share in 2021							(303,742)
Losses on sales of shares of treasury stock							(1)
Purchases of shares of treasury stock (Note 18)											(50,028)
Sales of shares of treasury stock											2,635
Retirement of common stock					(58,626)						58,626
Net decrease resulting from changes in interests in consolidated subsidiaries, consolidated VIEs, and affiliated companies											16
Initial subscriptions of noncontrolling interests												58,228
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders												(8,627)
Decrease in noncontrolling interests related to deconsolidation of subsidiaries												(119,797)
Decrease in noncontrolling interests related to disposition of subsidiaries												(3,488)
Net income attributable to noncontrolling interests		12,760										12,760
Dividends paid to noncontrolling interests												(8,487)
Net change during the fiscal year, Other comprehensive income (loss), net of taxes		(124,155)							(136,148)			11,993
Other—net					12,364							247
Balance at end of fiscal year at Mar. 31, 2020		15,744,516	15,016,487	2,090,270	5,533,520	239,571	8,079,530		(420,417)		(505,987)	728,029
Balance at end of fiscal year (Foreign Affiliated Company [Member]) at Mar. 31, 2020	[2]							(1,825)
Balance at end of fiscal year (Leases [Member]) at Mar. 31, 2020								(14,883)
Effect of adopting new guidance		15,744,516	15,016,487	2,090,270	5,533,520	239,571	8,079,530		(420,417)		(505,987)	728,029
Effect of adopting new guidance | Foreign Affiliated Company [Member]	[2]							(1,825)
Effect of adopting new guidance | Leases [Member]								(14,883)
Stock-based compensation					2,762
Net income attributable to Mitsubishi UFJ Financial Group		1,117,298					1,117,298
Common stock—¥21.00 per share in 2019, ¥23.50 per share in 2020, and ¥25.00 per share in 2021							(321,089)
Losses on sales of shares of treasury stock							(1)
Purchases of shares of treasury stock (Note 18)											(20)
Sales of shares of treasury stock											2,598
Net decrease resulting from changes in interests in consolidated subsidiaries, consolidated VIEs, and affiliated companies											337
Initial subscriptions of noncontrolling interests												9,246
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders												(96,335)
Decrease in noncontrolling interests related to deconsolidation of subsidiaries												(22,430)
Decrease in noncontrolling interests related to disposition of subsidiaries												(23)
Net income attributable to noncontrolling interests		46,096										46,096
Dividends paid to noncontrolling interests												(6,523)
Net change during the fiscal year, Other comprehensive income (loss), net of taxes		81,840							130,902			(49,062)
Other—net					(2,521)							(63)
Balance at end of fiscal year at Mar. 31, 2021		16,244,554	15,660,949	2,090,270	5,533,761	239,571	8,589,900		(289,481)		(503,072)	583,605
Balance at end of fiscal year (Measurement of credit losses on financial instruments [Member]) at Mar. 31, 2021								(285,838)		34			¥ (25,330)
Effect of adopting new guidance		¥ 16,244,554	¥ 15,660,949	¥ 2,090,270	¥ 5,533,761	¥ 239,571	¥ 8,589,900		¥ (289,481)		¥ (503,072)	¥ 583,605
Effect of adopting new guidance | Measurement of credit losses on financial instruments [Member]								¥ (285,838)		¥ 34			¥ (25,330)
[1]	The effect resulted from the adoption of new accounting guidance on “Leases”.
[2]	The effect resulted from the adoption of new accounting guidance on “Measurement of Credit Losses on Financial Instruments”.

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - ¥ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cash dividends: Common stock, per share	¥ 25	¥ 23.50	¥ 21
Mitsubishi UFJ Financial Group Shareholders' Equity [Member] | Unappropriated Retained Earnings [Member]
Cash dividends: Common stock, per share	¥ 25	¥ 23.50	¥ 21

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income before attribution of noncontrolling interests	¥ 1,163,394	¥ 318,715	¥ 737,605
Adjustments to reconcile net income before attribution of noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization (Notes 5 and 6)	337,411	350,817	333,950
Impairment of goodwill (Note 6)	147,564	383,810
Impairment of intangible assets (Note 6)	21,680	3,732	118,108
Provision for credit losses (Note 4)	484,210	321,713	34,330
Employee benefit cost (income) for severance indemnities and pension plans (Note 13)	2,804	(6,917)	(19,839)
Investment securities (gains) losses—net	(1,458,264)	532,248	252,307
Amortization of premiums on investment securities	59,614	65,078	78,509
Changes in financial instruments measured at fair value under fair value option, excluding trading account securities—net (Note 31)	5,002	2,894	13,880
Foreign exchange (gains) losses—net	(103,917)	544,763	565,304
Equity in earnings of equity method investees—net	(355,730)	(282,712)	(209,732)
Provision (benefit) for deferred income tax expense	266,273	(60,967)	(47,796)
Decrease (increase) in trading account assets, excluding foreign exchange contracts	1,351,570	(4,902,492)	(2,695,035)
Increase (decrease) in trading account liabilities, excluding foreign exchange contracts	(1,463,152)	2,217,808	1,370,846
Net increase in collateral for derivative transactions	(421,781)	(217,864)	(79,338)
Net decrease (increase) in margin for listed derivative transactions	20,984	(279,844)	(87,075)
Increase in cash collateral for the use of the Bank of Japan's settlement infrastructure	(33,292)	(54,018)	(60,462)
Other—net	(269,437)	(292,664)	(77,228)
Net cash provided by (used in) operating activities	(245,067)	(1,355,900)	228,334
Cash flows from investing activities:
Proceeds from sales of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) (Note 3)	62,660,266	60,731,107	31,283,601
Proceeds from maturities of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) (Note 3)	43,245,884	24,335,639	26,448,801
Purchases of Available-for-sale debt securities (including purchases of debt securities under the fair value option) (Note 3)	(115,383,753)	(87,618,074)	(62,309,072)
Proceeds from maturities of Held-to-maturity debt securities	605,781	708,068	560,646
Purchases of Held-to-maturity debt securities	(382,159)	(495,346)	(1,192,989)
Proceeds from sales and redemption of Equity securities (including proceeds from equity securities under the fair value option)	1,903,784	3,871,908	2,722,948
Purchases of Equity securities (including purchases of equity securities under the fair value option)	(1,561,344)	(3,129,666)	(2,770,356)
Purchase of common stock in Bank Danamon, an equity method investee of BK (Note 2)			(132,335)
Acquisition of Bank Danamon, a subsidiary of BK, net of cash acquired (Note 2)		(243,597)
Acquisition of FSI (formerly, Colonial First State Global Asset Management), subsidiaries of TB, net of cash acquired (Note 2)		(249,615)
Acquisition of DVB Bank's Aviation Finance Division, net of cash acquired (Note 2)		(555,250)
Net decrease (increase) in loans	2,939,996	(1,631,085)	330,198
Net decrease (increase) in call loans, funds sold, and receivables under resale agreements and securities borrowing transactions	9,833,348	(13,714,288)	627,327
Proceeds from sales of premises and equipment	41,472	64,400	26,191
Capital expenditures for premises and equipment	(116,707)	(123,804)	(126,479)
Purchases of intangible assets	(250,061)	(308,081)	(276,880)
Proceeds from sales and dispositions of investments in equity method investees	64,011	171,882	161,566
Proceeds from sales of consolidated VIEs and subsidiaries—net	71,643	168,970	64,395
Other—net	(14,802)	(68,611)	(49,590)
Net cash provided by (used in) investing activities	3,657,359	(18,085,443)	(4,632,028)
Cash flows from financing activities:
Net increase in deposits	23,428,386	5,746,624	3,602,674
Net increase (decrease) in call money, funds purchased, and payables under repurchase agreements and securities lending transactions	(8,523,347)	8,077,351	(303,042)
Net increase (decrease) in due to trust account and other short-term borrowings	(939,069)	9,944,171	(768,649)
Proceeds from issuance of long-term debt	18,707,004	4,999,531	5,020,636
Repayments of long-term debt	(11,360,120)	(4,983,073)	(4,236,887)
Proceeds from sales of treasury stock	899	1,235	2,322
Payments for acquisition of treasury stock (Note 18)	(20)	(50,028)	(159,962)
Dividends paid	(321,024)	(303,728)	(275,581)
Dividends paid by subsidiaries to noncontrolling interests	(6,523)	(8,487)	(15,853)
Other—net	(22,566)	358,922	197,673
Net cash provided by financing activities	20,963,620	23,782,518	3,063,331
Effect of exchange rate changes on cash and cash equivalents	397,287	(362,652)	43,975
Net increase (decrease) in cash and cash equivalents	24,773,199	3,978,523	(1,296,388)
Cash and cash equivalents at beginning of fiscal year	78,555,591	74,577,068	75,873,456
Cash and cash equivalents: Cash, due from banks and interest-earning deposits in other banks	103,324,201	78,549,712	74,571,260
Cash and cash equivalents: Restricted cash included in other assets	4,589	5,879	5,808
Cash and cash equivalents at end of fiscal year	103,328,790	78,555,591	74,577,068
Cash paid during the fiscal year for:
Interest	879,917	1,759,239	1,488,136
Income taxes, net of refunds	124,705	128,124	302,019
Non-cash investing and financing activities:
Assets acquired under finance lease arrangements (Note 7)	3,487	12,754	11,280
Assets acquired under operating lease arrangements (Note 7)	¥ 50,564	46,482
Available-for-sale debt securities transferred to Held-to-maturity debt securities			221,537
Marketable Equity Securities issued by Bank Danamon transferred to investments in subsidiaries and affiliates (Note 2)			¥ 98,934
Acquisition of Bank Danamon, a subsidiary of BK (Note 2):
Fair value of assets acquired, excluding cash and cash equivalents		1,811,160
Fair value of liabilities assumed		1,242,115
Fair value of noncontrolling interests		51,314
Acquisition of FSI (formerly, Colonial First State Global Asset Management), subsidiaries of TB (Note 2):
Fair value of assets acquired, excluding cash and cash equivalents		332,914
Fair value of liabilities assumed		68,519
Acquisition of DVB Bank's Aviation Finance Division (Note 2):
Fair value of assets acquired		572,487
Fair value of liabilities assumed		¥ 2,599

Basis of Financial Statements a

Basis of Financial Statements and Summary of Significant Accounting Policies [Text Block]	12 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Financial Statements and Summary of Significant Accounting Policies [Text Block]	1. BASIS OF FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 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 29 for more information by business segment. Basis of Financial Statements The accompanying consolidated financial statements are presented in Japanese yen, the currency of the country in which MUFG is incorporated and principally operates. The accompanying consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States of America (“U.S. GAAP”). In certain respects, the accompanying consolidated financial statements reflect adjustments which are not included in the consolidated financial statements issued by MUFG and certain of its subsidiaries in accordance with applicable statutory requirements and accounting practices in their respective countries of incorporation. The major adjustments include those relating to (1) investment securities, (2) derivative financial instruments, (3) allowance for credit losses, (4) income taxes, (5) consolidation, (6) premises and equipment, (7) transfer of financial assets, (8) accrued severance indemnities and pension liabilities, (9) goodwill and other intangible assets and (10) lease transactions. Fiscal years of certain subsidiaries, which end on December 31, and MUFG’s fiscal year, which ends on March 31, have been treated as coterminous. For the fiscal years ended March 31, 2019, 2020 and 2021, the effect of recording intervening events for the three-month periods ended March 31 on MUFG’s proportionate equity in net income of subsidiaries with fiscal years ended on December 31, would have resulted in an increase of ¥19.97 billion, a decrease of ¥164.48 billion, and an increase of ¥157.32 billion to net income attributable to Mitsubishi UFJ Financial Group, respectively. No intervening events occurred during each of the three-month periods ended March 31, 2019, 2020 and 2021 which, if recorded, would have had material effects on consolidated total assets, loans, total liabilities, deposits or total equity as of March 31, 2019, 2020 and 2021. Use of Estimates The preparation of 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to management judgment primarily relate to the allowance for credit losses, the valuation of deferred tax assets, the valuation of financial instruments, the accounting for goodwill and intangible assets, impairment of investment securities, the allowances for repayment of excess interest and accrued severance indemnities and pension liabilities. Summary of Significant Accounting Policies Significant accounting policies applied in the accompanying consolidated financial statements are summarized below: Consolidation investees-net. The MUFG Group consolidates VIEs if it has the power to direct the activities of a VIE which most significantly impact the VIE’s economic performance and has the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. To assess whether a VIE should be consolidated or not, the MUFG Group considers all factors, such as the purpose and design of the VIE, contractual arrangements, and the MUFG Group’s involvement in both the establishment of the VIE and day-to-day Assets that the MUFG Group holds in an agency, fiduciary or trust capacity are not assets of the MUFG Group and, accordingly, are not included in the accompanying consolidated balance sheets. Cash Flows Translation of Foreign Currency Financial Statements and Foreign Currency Transactions year-end Foreign currency translation gains and losses related to the financial statements of overseas entities of the MUFG Group, net of related income tax effects, are credited or charged directly to Foreign currency translation adjustments, a component of Accumulated other comprehensive income (“Accumulated OCI”). Tax effects of gains and losses on foreign currency translation of the financial statements of overseas entities are not recognized unless it is apparent that the temporary differences will reverse in the foreseeable future. Foreign currency-denominated assets and liabilities are translated into the functional currencies of the individual entities included in consolidation at the respective fiscal year-end Repurchase Agreements, Securities Lending and Other Secured Financing Transactions off-balance off-balance Collateral mark-to-market Trading Account Securities Investment Securities Held-to-maturity Available-for-sale net-of-tax Available-for-sale recovery of its amortized cost basis. If not, the credit component of an impairment loss is recognized in earnings by recording an allowance for credit losses, limited by the amount of impairment loss. However, the noncredit component of an impairment loss is recognized in Accumulated OCI. In determining whether a credit loss exists, the MUFG Group generally considers factors such as the financial condition of the issuer and the extent of decline in fair value. For Held-to-maturity Equity securities include marketable equity investment securities and nonmarketable equity investment securities. Marketable equity investment securities are measured at fair value with unrealized gains or losses reflected in net income. Nonmarketable equity investment securities are primarily measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes. Nonmarketable equity investment securities held by subsidiaries that are investment companies or brokers and dealers, are subject to the specialized industry accounting principles for investment companies and brokers and dealers. Securities of those subsidiaries are carried at their fair values. Interest and dividends on investment securities are reported in Interest income. Dividends are recognized when the shareholder right to receive the dividend is established. Gains and losses on disposition of investment securities are computed using the average cost method and are recognized on the trade date. Derivative Financial Instruments Derivatives entered into for trading purposes are carried at fair value and are reported as Trading account assets or Trading account liabilities, as appropriate. The fair values of derivative contracts executed with the same counterparty under legally enforceable master netting agreements are presented on a gross basis. Changes in the fair value of such contracts are recognized currently in Foreign exchange gains (losses)—net with respect to foreign exchange contracts and in Trading account profits (losses)—net with respect to interest rate contracts and other types of contracts. Embedded features that are not clearly and closely related to the host contracts and meet the definition of derivatives are separated from the host contracts and measured at fair value unless the contracts embedding the derivatives are measured at fair value in their entirety. Derivatives are also used to manage exposures to fluctuations in interest and foreign exchange rates arising from mismatches of asset and liability positions. Certain of those derivatives are designated as hedging instruments and qualify for hedge accounting. The MUFG Group designates a derivative as a hedging instrument at the inception of each such hedge relationship, and it documents, for such individual hedging relationships, the risk management objective and strategy, including the item being hedged, the specific risk being hedged and the method used to assess the hedge effectiveness. In order for a hedging relationship to qualify for hedge accounting, the changes in the fair value of the derivative instruments must be highly effective in achieving offsetting changes in fair values or variable cash flows of the hedged items attributable to the risk being hedged. All qualifying hedging derivatives are valued at fair value and included in Other assets or Other liabilities, as appropriate. For fair value hedges, the changes in the fair value of a hedging instrument are recognized in the same income statement line as the hedged item. For cash flow hedges, the changes in the fair value of a hedging instrument are recognized in Accumulated OCI. Amounts realized on cash flow hedges related to variable rate loans are recognized in Net interest income in the period when the cash flow from the hedged item is realized. Any difference that arises from gains or losses on hedging derivatives offsetting corresponding gains or losses on the hedged items, and gains and losses on derivatives attributable to the risks excluded from the assessment of hedge effectiveness are recognized in earnings. Loans held-for-sale The MUFG Group classifies its loan portfolio into the following portfolio segments—Commercial, Residential, Card, MUFG Americas Holdings Corporation (“MUFG Americas Holdings” or “MUAH”), Bank of Ayudhya Public Company Limited (“Krungsri”), and Other 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. Past due status is determined based on the contractual terms of the loan and the actual number of days since the date the last payment was made. Originated loans are generally placed on nonaccrual status when substantial doubt exists as to the full and timely collection of either principal or interest, specifically 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. A nonaccrual loan may be restored to an accrual status when interest and principal payments become current and management expects that the borrower will make future contractual payments as scheduled. When a loan is placed on nonaccrual status, interest accrued but not received is generally reversed against interest income. Cash receipts on nonaccrual loans, for which the ultimate collectibility of principal is uncertain, are applied as principal reductions; otherwise, such collections are credited to income. The MUFG Group modifies certain loans in conjunction with its loss-mitigation activities. Through these modifications, concessions are granted to a borrower who is experiencing financial difficulty, generally in order to minimize economic loss, to avoid foreclosure or repossession of collateral, and to ultimately maximize payments received from the borrower. The concessions granted vary by portfolio segment, by program, and by borrower-specific characteristics, and may include interest rate reductions, term extensions, payment deferrals, and partial principal forgiveness. Loan modifications that represent concessions made to borrowers who are experiencing financial difficulties are identified as troubled debt restructurings (“TDRs”). Generally, accruing loans that are modified in a TDR remain as accruing loans subsequent to the modification, and nonaccrual loans remain as nonaccrual. However, if a nonaccrual loan has been modified as a TDR, the borrower is not delinquent under the modified terms, and demonstrates that its financial condition has improved, the MUFG Group may reclassify the loan to accrual status. This determination is generally performed at least once a year through a detailed internal credit rating review process. Once a nonaccrual loan is deemed to be a TDR, the MUFG Group will continue to designate the loan as a TDR even if the loan is reclassified to accrual status. Loan Securitization Allowance for Credit Losses (Loans) Actual credit losses (amounts deemed uncollectible, in whole or in part), net of recoveries, are generally determined based on detailed loan reviews and a credit assessment by management at each balance sheet date and are deducted from the allowance for credit losses as net charge-offs. The MUFG Group generally applies its charge-off Key elements relating to the policies and discipline used in determining the allowance for credit losses are credit classification and the related borrower categorization process. The categorization is based on conditions that may affect the ability of borrowers to service their debt, taking into consideration current financial information, historical payment experience, credit documentation, public information, analyses of relevant industry segments or existing economic conditions. In determining the appropriate level of the allowance, the MUFG Group evaluates the probable loss by collateral value, historical loss experience, probability of insolvency and category of loan based on its type and characteristics. The methodologies used to estimate the allowance and the charge-off Commercial segment In the Commercial segment, expected credit losses of loans are measured on a collective basis when similar risk characteristics exist. Risk characteristics that are considered for aggregation of loans include internal credit ratings, geographical location, and industry of the borrower. The collectively-assessed allowance is measured over the contractual term of the loans that is adjusted for expected prepayments, using probability of default (“PD”), loss given default (“LGD”) and exposure at default (“EAD”) loss forecasting model, which is based on historical information and adjusted to incorporate expectations of future economic conditions considering economic variables such as gross domestic product and unemployment rates. The PD is determined as the marginal PD that denotes the likelihood that a borrower is observed to experience the default during a defined period of time, based on internal credit rating, geographical location, or industry of the borrower. The LGD is determined as the estimated loss on the loan that would be realized upon the default of the borrower, mainly based on the historical experience of collections against loans in default. The PD and LGD are continually reviewed to determine the appropriate level of the allowance for credit loss. Qualitative adjustments are made to cover losses that are expected but not adequately captured in the quantitative forecasting model or economic assumptions, considering factors such as borrowers’ ability to make scheduled payments, loans’ remaining time to maturity and extent of prepayments, the volume and severity of past due loans, changes in lending policy and procedures, the industry in which a borrower operates, and changes in other external factors. The collectively-assessed allowance methodology incorporates an economic forecast over a three-year period. Beyond the three-year economic forecast, the allowance methodology reverts to an average historical loss information on a straight-line basis over a two-year The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis. For nonaccrual TDRs, the allowance for credit losses is provided for these loans using the discounted cash flow method, or based on the fair value of the collateral. For TDRs accounted for as accruing loans, the allowance for credit losses is determined by discounting the estimated future cash flows using the original effective interest rate of the loans prior to modification. In relation to loans categorized as Legally/Virtually Bankrupt, the carrying amount of loans less estimated value of the collateral and guaranteed amount is generally considered uncollectible, and is charged off. Residential segment In the Residential segment, the loans are comprised of smaller-balance homogeneous loans and expected credit losses of loans are measured on a collective basis. The allowance for credit losses is measured over the contractual term of the loans that is adjusted for expected prepayments, using the state transition probability matrix, which captures delinquency status changes and prepayments by loans’ remaining term, and is based on historical information and adjusted to incorporate expectations of future economic conditions considering economic variables, such as unemployment rates. The LGD is also used to capture the estimated loss on the loan that would be realized upon the default of the borrower. The allowance methodology incorporates an economic forecast over a period. Beyond the three-year economic forecast, the allowance methodology reverts to average historical loss information on a straight-line basis over a two-year period. The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis. For nonaccrual TDRs, the allowance for credit losses is provided for these loans using the discounted cash flow method, or based on the fair value of the collateral. For TDRs accounted for as accruing loans, the allowance for credit losses is determined by discounting the estimated future cash flows using the original effective interest rate of the loans prior to modification. In relation to loans that are in past due status over a certain period of time and deemed uncollectible, the carrying amount of loans less estimated value of the collateral and guaranteed amount is generally considered uncollectible and charged off. Card segment In the Card segment, the loans are smaller-balance homogeneous loans and expected credit losses of loans are measured on a collective basis. The allowance for credit losses is measured over the contractual term of the loans that is adjusted for expected prepayments, using the state transition probability matrix, which captures delinquency status changes and prepayments by loans’ remaining term, and is based on historical information and adjusted to incorporate expectations of future economic conditions considering economic variables, such as unemployment rate. The collectively-assessed allowance methodology incorporates an economic forecast over a three-year period. Beyond the three-year economic forecast, the allowance methodology reverts to average historical loss information. The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis, and the allowance for credit losses is determined using the discounted cash flow method whereby the estimated future cash flows are discounted using the original effective interest rate of the loans prior to modification. In relation to loans that are in past due status over a certain period of time and deemed uncollectible, the amount of loans is generally fully charged off. MUFG Americas Holdings segment In the MUFG Americas Holdings segment, expected credit losses are measured on a collective basis when similar risk characteristics exist. The allowance for credit loss is calculated as the product of PD, LGD, and EAD modeled parameters that are projected on a monthly basis over the assets’ remaining contractual lives. The sum of each month’s expected loss calculation results in the collectively-assessed allowance estimate. Expected loss models use historical loss information and a variety of economic assumptions that consider economic variables such as gross domestic product and unemployment rates, to estimate PD, LGD, and EAD. These models are tailored to different loan segments, classes and products by changing the economic variables or their weighting in the calculation used to estimate expected losses. The collectively-assessed allowance methodology incorporates an economic forecast over a two-year period. Beyond the two-year economic forecast, the allowance methodology reverts to average historical loss information on a straight-line basis over two-year period. Loans that do not share risk characteristics are evaluated individually to determine the allowance balance. Individually-assessed allowance is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, or the fair value of the collateral if the loan is collateral dependent. Management implements qualitative adjustments to the collectively-assessed allowance to account for the risks not incorporated in the model between current conditions and those reflected in the historical loss information used to estimate the models. These qualitative factors include changes in credit policies, problem loan trends, identification of new risks not incorporated into the modeling framework, credit concentrations, changes in lending management and other external factors. Qualitative adjustments are also used to adjust the collectively-assessed allowance to account for risks attributed to imprecision in the economic forecast and when risks emerge that impact specific portfolio components (i.e., natural disasters). The allocated allowance for large groups of smaller-balance homogeneous loans is established for consumer loans as well as for smaller balance commercial loans. These loans are managed on a pool basis, and loss factors are based on expected net charge-off The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured either individually or in pools with similar risk characteristics. The allowance for individually assessed TDR loans can be measured using a discounted cash flow methodology, or by evaluating the fair value of the collateral, if collateral dependent. When the value of a concession cannot be measured using a method other than the discounted cash flow method, the value of a concession is measured by discounting the expected future cash flows at the original interest rate of the loan. Commercial loans are generally considered uncollectible based on an evaluation of the financial condition of a borrower as well as the value of any collateral and, when considered to be uncollectible, loans are charged off in whole or in part. Consumer loans are generally considered uncollectible based on past due status and the value of any collateral and, when considered to be uncollectible, loans are charged off in whole or in part. Krungsri segment In the Krungsri segment, expected credit losses are measured on a collective basis for portfolios of loans that share similar economic risk characteristics. Expected credit losses are a probability-weighted estimate of the present value of credit losses. These are measured as the present value of the difference between the cash flows under the contract and the cash flows expected to be received arising from the weighting of multiple future economic scenarios that consider economic variables such as gross domestic product and unemployment rates, discounted at the loan’s effective interest rate. Qualitative adjustments are made when considered appropriate. Loans that do not share risk characteristics are evaluated individually to determine the allowance balance. Individually-assessed allowance is measured based on the present value of expected future cash flows discounted at the loan’s original effective interest rate, or the fair value of the collateral if the loan is collateral dependent. The allocated allowance for large groups of smaller-balance homogeneous loans is established for smaller balance loans such as housing loans, credit card loans, and personal loans. These loans are managed on a pool basis, and loss factors are based on expected net charge-off The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis. For nonaccrual TDRs, the allowance for credit losses is provided for these loans using the discounted cash flow method, or based on the fair value of the collateral. For TDRs accounted for as accruing loans, the allowance for credit losses is determined by using the discounted cash flow method whereby the estimated future cash flows are discounted using the original effective interest rate of the loans prior to modification. Loans to customers are charged off when they are determined to be uncollectible considering the financial condition of a borrower. In all segments, when estimating the allowance for credit losses, significant management assumptions are incorporated in economic variables, qualitative adjustments, or both to capture the heightened volatility and uncertainty in the economy due to the COVID-19 There are de minimis or zero expected credit losses, for example, for lending and financing transactions, such as Interest-earning deposits in other banks, Call loans and funds sold, Receivables under resale agreements and Receivables under securities borrowing transactions because the term is short and the credit quality of the borrowers is normal. Allowance for Off-Balance off-balance Premises and Equipment Years Buildings 15 to 50 Equipment and furniture 2 to 20 Leasehold improvements 2 to 39 Maintenance, repairs and minor improvements are charged to operations as incurred. Major improvements are capitalized. Net gains or losses on dispositions of premises and equipment are included in Other non-interest Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of an asset to be held and used is measured by a comparison of the carrying amount to future undiscounted net cash flows expected to be generated by the asset. If an asset is considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the asset exceeds the fair value. For purposes of recognition and measurement of an impairment loss, a long-lived asset or assets are grouped with other assets and liabilities at the lowest level with independent and identifiable cash flows. Assets to be disposed of by sale are reported at the lower of the carrying amount or fair value less estimated cost to sell. Asset retirement obligations related to restoration of certain leased properties upon lease termination are recorded in Other liabilities with a corresponding increase in leasehold improvements. The amounts represent the present value of expected future cash flows associated with returning such leased properties to their original condition. The difference between the gross and present value of expected future cash flows is accreted over the life of the related leases as a non-interest Goodwill Goodwill arising from a business combination is not amortized but is tested at least annually for impairment. Goodwill is recorded at a designated reporting unit level for the purpose of assessing impairment. A reporting unit is an operating segment, or an identified business unit one level below an operating segment. An impairment loss is recognized to the extent that the carrying amount of a reporting unit exceeds its fair value, but not exceeding the total amount of goodwill allocated to that reporting unit. Intangible assets Useful lives Amortization method Software 3 to 10 Straight-line Core deposit intangibles 9 to 16 Straight-line Customer relationships 3 to 27 Straight-line, Declining-balance Trade names 4 to 40 Straight-line Intangible assets having indefinite useful lives are not amortized but are subject to annual impairment tests. An impairment exists if the carrying value of an indefinite-lived intangible asset exceeds its fair value. For other intangible assets subject to amortization, an impairment is recognized if the carrying amount is not recoverable and the carrying amount exceeds the fair value of the intangible asset. The MUFG Group capitalizes certain costs associated with the acquisition or development of internal-use internal-use Accrued Severance and Pension Liabilities non-interest Long-Term Debt Obligations under Guarantees Allowance for Repayment of Excess Interest recent trend of borrowers’ claims for reimbursement, and management’s future forecasts. The allowance is recorded as a liability in Other liabilities. Fees and Commissions The following is an explanation of the MUFG Group’s key revenue from contracts with customers and the timing of its recognition. 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 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 services is satisfied and the fees and commissions are recognized over the course of each month. Fees and commissions on remittances and transfers consist of fees and commissions charged for settlement transactions such as domestic fund remittances, including electronic banking transactions, 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. 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. Fees and commissions on credit card business consist of fees and commissions 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. 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

Business Developments _Text Blo

Business Developments [Text Block]	12 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Business Developments [Text Block]	2. BUSINESS DEVELOPMENTS 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, small and medium enterprise (“SME”) and corporate customers, with a network of around 900 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 was executed through three steps (the “Proposed Transaction”), and the completion of the Proposed Transaction resulted 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 acquired an additional 54.0% equity interest in Danamon from AFI and other shareholders on April 29, 2019, based on a price of IDR 9,590 (approximately ¥77 (3) non-interest (3) On May 1, 2019, MUFG Bank merged BNP into Danamon, acquiring an additional equity interest in Danamon in exchange for its equity interest in BNP, which resulted in MUFG Bank holding 94.1% equity interest in Danamon. Notes: (1) Calculated based on the exchange rate of IDR1 = ¥0.0084 (2) Calculated based on the exchange rate of IDR1 = ¥0.0077 (3) Calculated based on the exchange rate of IDR1 = ¥0.0080 The following table summarizes the estimated fair values of the assets acquired and liabilities assumed of Danamon and its subsidiaries as of the acquisition date: (in millions) Loans ¥ 1,086,638 Intangible assets (1) 146,899 Total assets 1,728,480 Deposits—Total deposits 915,075 Total liabilities 1,242,115 Note: (1) Intangible assets with a weighted average amortization period of 13.2 years primarily include ¥79,552 million of relationships with agents with a weighted average amortization period of 13.1 years and ¥44,140 million of core deposit intangibles with a weighted average amortization period of 10.1 years. Included in the table above are loans with fair values totaling ¥1,068,906 million, which were not subject to the guidance on loans and debt securities acquired with deteriorated credit quality. As of the acquisition date, the gross contractual amounts receivable for these loans totaled ¥1,082,422 million, of which ¥34,363 million is not expected to be collected. Acquisition of Colonial First State Global Asset Management On August 2, 2019, Mitsubishi UFJ Trust and Banking acquired 100% of the shares in each of the nine subsidiaries of Colonial First State Group Limited, for ¥312,225 million in cash, from Australian financial group Commonwealth Bank of Australia and its wholly-owned subsidiary, Colonial First State Group Limited, and thereby recorded goodwill of ¥177,065 million, none of which is deductible for income tax purposes and intangible assets of ¥105,973 million with a weighted average amortization period of 18.7 years primarily include ¥100,862 million of customer relationships with a weighted average amortization period of 18.0 years. These nine subsidiaries collectively, including their subsidiaries, had represented the global asset management business of Colonial First State Global Asset Management, and were renamed First Sentier Investors (“FSI”) on September 16, 2019. The MUFG Group is seeking the opportunities to enhance its competitive edge as well as expanding its client base globally in asset management business. The acquisition of FSI is a milestone to strengthen its capability and that is the reason such goodwill was paid which is allocated to the segment of Asset Management & Investor Services Business Group. The MUFG Group will continue to respond to customer expectations by leveraging the advantages and brands of FSI as well as the MUFG Group’s original asset management arms, aiming to become an asset management service provider with a global presence. The assets acquired and liabilities assumed were recorded at their estimated fair values on the acquisition date. During the fiscal year ended March 31, 2020, the MUFG Group incurred ¥3,775 million of acquisition-related costs. These expenses are included in Other non-interest Acquisition of DVB Bank SE’s Aviation Finance Division On March 1, 2019, MUFG Bank and BOT Lease Co., Ltd. (“BOT Lease”), entered into an agreement with DVB Bank SE (“DVB”) to transfer DVB’s aviation finance division, including aviation finance-related business, to MUFG Bank and BOT Lease. The purpose of the transaction is to improve the MUFG Group’s ability to offer bespoke solutions to its clients by enhancing its global corporate investment banking business platform in terms of higher returns, diversifying its portfolio, broadening its customer base, and securing experienced professionals. On November 18, 2019, MUFG Bank acquired DVB’s most of aviation finance client lending portfolio, employees, and other part of the operation infrastructure for ¥555 billion in cash. MUFG Bank recorded goodwill of ¥32,591 million. During the fiscal year ended March 31, 2021, the purchase price adjustments were made, which increased goodwill by ¥ million. In November 2020, MUFG Bank decided to discontinue the acquisition of DVB’s aviation investment management and asset management businesses, that was initially planned to be transferred to a newly established subsidiary of BOT Lease, since it was difficult to fully obtain the approval of the relevant national authorities. The following table summarizes the estimated fair values of the assets acquired and liabilities as of the acquisition date: (in millions) Loans ¥ 515,933 Total assets 522,797 Total liabilities 138

Investment Securities _Text Blo

Investment Securities [Text Block]	12 Months Ended
	Mar. 31, 2021
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, 2020: Amortized Gross Gross Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 23,308,538 ¥ 185,302 ¥ 30,961 ¥ 23,462,879 Japanese prefectural and municipal bonds 2,938,743 16,279 2,202 2,952,820 Foreign government and official institution bonds 2,936,110 107,406 6,028 3,037,488 Corporate bonds 1,261,586 12,445 1,205 1,272,826 Residential mortgage-backed securities 1,460,641 3,083 4,331 1,459,393 Commercial mortgage-backed securities 379,234 6,110 3,089 382,255 Asset-backed securities 1,461,083 9,516 1,123 1,469,476 Other debt securities (1) 161,832 3,190 1,956 163,066 Total ¥ 33,907,767 ¥ 343,331 ¥ 50,895 ¥ 34,200,203 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,574 ¥ 29,856 ¥ — ¥ 1,130,430 Foreign government and official institution bonds 151,555 243 689 151,109 Residential mortgage-backed securities 737,242 10,478 3,012 (2) 744,708 Commercial mortgage-backed securities 146,039 2,993 317 (2) 148,715 Asset-backed securities 2,030,371 277 27,716 2,002,932 Total ¥ 4,165,781 ¥ 43,847 ¥ 31,734 ¥ 4,177,894 Notes: (1) Other debt securities in the table above mainly include ¥86,734 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 At March 31, 2021: Amortized Gross Gross Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 35,166,245 ¥ 147,844 ¥ 40,878 ¥ 35,273,211 Japanese prefectural and municipal bonds 3,719,205 15,123 2,815 3,731,513 Foreign government and official institution bonds 2,854,037 84,707 11,781 2,926,963 Corporate bonds 1,123,271 11,400 401 1,134,270 Residential mortgage-backed securities 1,459,062 9,119 1,051 1,467,130 Commercial mortgage-backed securities 435,975 29,502 912 464,565 Asset-backed securities 1,373,450 11,685 650 1,384,485 Other debt securities 168,528 3,780 730 171,578 Commercial paper 564,072 31 5 564,098 Total ¥ 46,863,845 ¥ 313,191 ¥ 59,223 ¥ 47,117,813 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,447 ¥ 23,033 ¥ — ¥ 1,123,480 Foreign government and official institution bonds 233,883 2,262 2,795 233,350 Residential mortgage-backed securities 411,024 18,590 — (1) 429,614 Commercial mortgage-backed securities 111,750 4,846 — (1) 116,596 Asset-backed securities 2,046,659 1,721 12,277 2,036,103 Total ¥ 3,903,763 ¥ 50,452 ¥ 15,072 ¥ 3,939,143 Note: (1) 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 Available-for-sale Amortized Fair value Fair value (in millions) Due in one year or less ¥ 14,562 ¥ 14,572 ¥ 24,815,321 Due from one year to five years 1,179,959 1,205,257 8,129,683 Due from five years to ten years 826,833 827,481 8,549,713 Due after ten years 1,882,409 1,891,833 5,623,096 Total ¥ 3,903,763 ¥ 3,939,143 ¥ 47,117,813 Realized Gains and Losses For the fiscal years ended March 31, 2019, 2020 and 2021, gross realized gains on sales of Available-for-sale Available-for-sale Impairment Losses on Investment Securities For the fiscal year s Available-for-sale For the fiscal year ended March 31, 2021, as a result of the adoption of new guidance on a measurement of credit losses on financial instruments, an allowance for credit losses on Available-for-sale Held-to-maturity For the fiscal year ended March 31, 2021, impairment losses on Available-for-sale For the fiscal year ended March 31, 2021, the MUFG Group’s Held-to-maturity 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, 2020: 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 ¥ 11,781,600 ¥ 30,961 ¥ — ¥ — ¥ 11,781,600 ¥ 30,961 202 Japanese prefectural and municipal bonds 935,540 2,202 — — 935,540 2,202 340 Foreign government and official institution bonds 564,620 5,481 114,407 547 679,027 6,028 153 Corporate bonds 522,941 1,191 25,228 14 548,169 1,205 154 Residential mortgage-backed securities 114,057 530 388,064 3,801 502,121 4,331 402 Commercial mortgage-backed securities 182,887 3,087 1,304 2 184,191 3,089 39 Asset-backed securities 189,775 503 86,605 620 276,380 1,123 94 Other debt securities 53,070 132 30,657 1,824 83,727 1,956 24 Total ¥ 14,344,490 ¥ 44,087 ¥ 646,265 ¥ 6,808 ¥ 14,990,755 ¥ 50,895 1,408 Held-to-maturity Foreign government and official institution bonds ¥ 55,746 ¥ 689 ¥ — ¥ — ¥ 55,746 ¥ 689 9 Residential mortgage-backed securities 108,478 1,033 360,841 1,979 469,319 3,012 281 Commercial mortgage-backed securities 10,281 32 133,791 285 144,072 317 31 Asset-backed securities 637,201 8,536 1,259,720 19,180 1,896,921 27,716 77 Total ¥ 811,706 ¥ 10,290 ¥ 1,754,352 ¥ 21,444 ¥ 2,566,058 ¥ 31,734 398 Less than 12 months 12 months or more Total At March 31, 2021: 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 ¥ 12,098,437 ¥ 31,055 ¥ 429,235 ¥ 9,823 ¥ 12,527,672 ¥ 40,878 286 Japanese prefectural and municipal bonds 870,007 1,584 276,172 1,231 1,146,179 2,815 405 Foreign government and official institution bonds 429,204 11,768 50,478 13 479,682 11,781 71 Corporate bonds 96,582 166 229,518 235 326,100 401 120 Residential mortgage-backed securities 378,351 577 139,214 474 517,565 1,051 218 Commercial mortgage-backed securities 36,633 905 2,616 7 39,249 912 21 Asset-backed securities 190,795 394 49,428 256 240,223 650 89 Other debt securities 22,812 91 22,388 639 45,200 730 17 Commercial paper 116,016 5 — — 116,016 5 8 Total ¥ 14,238,837 ¥ 46,545 ¥ 1,199,049 ¥ 12,678 ¥ 15,437,886 ¥ 59,223 1,235 Evaluating Available-for-sale The following describes the nature of the MUFG Group’s Available-for-sale Japanese national government and Japanese government agency bonds, Foreign government and official institution bonds As of March 31, 2021, 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, no credit loss was identified as of March 31, 2021 and no impairment loss has been recorded. Corporate bonds As of March 31, 2021, unrealized losses associated with corporate bonds were primarily related to private placement bonds issued by Japanese non-public Residential mortgage-backed securities As of March 31, 2021, 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 determined through analysis that no credit loss was identified on such securities as of March 31, 2021 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 March 31, 2021, unrealized losses on these securities were primarily driven by certain 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 credit loss and confirms the intent and ability to hold these securities until recovery. Based on the analysis performed, no credit loss was identified as of March 31, 2021 and no impairment loss has been recorded. Other debt securities As of March 31, 2021, unrealized losses on other debt securities 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 credit loss, 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 , credit loss was identified as of March 31, 2021. Equity Securities The following table presents net realized gains (losses) on sales of equity securities, and net unrealized losses on equity securities still held at March 31, 2019, 2020 and 2021: Fiscal years ended 2019 2020 2021 (in millions) Net gains (losses) recognized during the period (1) ¥ (278,746 ) ¥ (639,813 ) ¥ 1,467,763 Less: Net gains (losses) recognized during the period on equity securities sold during the period (3,303 ) (37,541 ) 47,775 Net unrealized gains (losses) recognized during the reporting period still held at the reporting date ¥ (275,443 ) ¥ (602,272 ) ¥ 1,419,988 Note: (1) Included in Investment securities gains (losses)—net. Measurement Alternative of Equity Securities The following table presents the carrying value of nonmarketable equity securities that are measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes (“measurement alternative”), held at March 31, 2020 and 2021: 2020 2021 (in millions) Measurement alternative balance ¥ 534,882 ¥ 356,074 The related adjustments for these securities for the fiscal years ended March 31, 2019, 2020 and 2021 were as follows: Fiscal years ended 2019 2020 2021 (in millions) Measurement alternative impairment losses (1)(4) ¥ (2,292 ) ¥ (3,099 ) ¥ (5,188 ) Measurement alternative downward changes for observable prices (1)(2)(3)(5) ¥ — ¥ (953 ) ¥ — Measurement alternative upward changes for observable prices (1)(2)(3)(6) ¥ 53,077 ¥ 6,223 ¥ 21,710 Notes: (1) Included in Investment securities gains (losses)—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. (3) The MUFG Group applied measurement alternative downward or upward changes to certain nonmarketable equity securities, resulting from observable prices in orderly transactions, such as partial repurchase and transactions by other entities. (4) The cumulative impairment losses at March 31, 2020 and 2021 were ¥5,007 million and ¥10,102 million, respectively. (5) The cumulative downward changes for observable prices at March 31, 2020 and 2021 were ¥953 million and ¥953 million, respectively. (6) The cumulative upward changes for observable prices at March 31, 2020 and 2021 were ¥34,466 million and ¥54,806 million, respectively.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Loans and Allowance for Credit Losses [Text Block]	4. LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans at March 31, 2020 and 2021 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. 2020 2021 (in millions) Domestic: Manufacturing ¥ 11,448,778 ¥ 13,133,360 Construction 733,212 763,958 Real estate 12,054,671 11,997,301 Services 2,585,111 2,908,975 Wholesale and retail 7,504,561 7,766,070 Banks and other financial institutions (1) 5,161,093 6,443,296 Communication and information services 1,572,344 1,407,738 Other industries 8,673,871 8,838,718 Consumer 15,319,721 15,066,986 Total domestic 65,053,362 68,326,402 Foreign: Governments and official institutions 726,347 655,367 Banks and other financial institutions (1) 11,788,225 10,649,029 Commercial and industrial 32,565,030 29,574,176 Other 8,404,062 6,822,771 Total foreign 53,483,664 47,701,343 Unearned income, unamortized premiums—net and deferred loan fees—net (350,287 ) (308,882 ) Total (2) ¥ 118,186,739 ¥ 115,718,863 Notes: (1) Loans to so-called “non-bank Non-bank (2) The above table includes loans held for sale of ¥344,790 million and ¥353,095 million at March 31, 2020 and 2021, respectively. The MUFG Group classifies its loan portfolio into the following portfolio segments—Commercial, Residential, Card, MUFG Americas Holdings, Krungsri, and Other 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 for further information. Effective as of April 1, 2020, all of the domestic classes within the Commercial segment were combined into one class. 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 for further information . The information on nonaccrual loans by class at March 31, 2020 and 2021, and recognized interest income on nonaccrual loans by class for the fiscal year ended March 31, 2021 are shown below: March 31, 2020: Nonaccrual (1) (in millions) Commercial Domestic ¥ 312,972 Foreign 127,001 Residential 63,998 Card 61,172 MUAH 35,840 Krungsri 149,732 Other 27,754 Total ¥ 778,469 Recorded Loan Balance March 31, 2021: Nonaccrual (1) Nonaccrual Loans (2) Recognized (in millions) Commercial Domestic ¥565,671 ¥ 111,141 ¥ 4,355 Foreign 258,391 96,833 5,110 Residential 67,968 4,720 923 Card 60,200 — 37 MUAH 73,706 30,242 1,057 Krungsri 161,338 3,042 5,562 Other 26,567 29 4,203 Total ¥ 1,213,841 ¥ 246,007 ¥ 21,247 Notes: (1) Nonaccrual loans in the above table do not include loans held for sale of ¥330 million and ¥8,562 million at March 31, 2020 and 2021, respectively, and do not include loans acquired with deteriorated credit quality of ¥25,427 million at March 31, 2020. (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, or the fair value of the collateral if the loan is a collateral-dependent loan. Impaired Loans The MUFG Group’s impaired loans primarily include nonaccrual loans and TDRs. The following table shows information about impaired loans by class at March 31, 2020: Recorded Loan Balance At March 31, 2020: Requiring Not Requiring (1) Total Unpaid Related (in millions) Commercial Domestic ¥ 598,737 ¥ 147,890 ¥ 746,627 ¥ 784,298 ¥ 268,070 Foreign 141,897 56,464 198,361 220,283 96,009 Loans acquired with deteriorated credit quality 12,906 — 12,906 19,947 4,767 Residential (3) 88,075 4,822 92,897 107,629 12,770 Card (3) 65,240 280 65,520 72,714 19,799 MUAH (3) 33,884 33,835 67,719 84,737 5,977 Krungsri (3) 68,126 30,833 98,959 106,265 30,198 Other (3) 22,749 1,091 23,840 26,091 6,152 Total (2) ¥ 1,031,614 ¥ 275,215 ¥ 1,306,829 ¥ 1,421,964 ¥ 443,742 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) In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥330 million at March 31, 2020. (3) Impaired Loans for Residential, Card, MUAH, Krungsri and Other segments in the above table include loans acquired with deteriorated credit quality. The following table shows information regarding the average recorded loan balance and recognized interest income on impaired loans for the fiscal years ended March 31, 2019 and 2020: 2019 2020 Average Recognized Average Recognized (in millions) Commercial Domestic ¥ 766,847 ¥ 12,383 ¥ 726,794 ¥ 8,722 Foreign 159,999 3,127 174,831 3,013 Loans acquired with deteriorated credit quality 7,814 182 9,395 74 Residential 107,165 1,620 98,238 1,252 Card 66,187 1,614 65,270 1,241 MUAH 71,162 2,292 82,832 2,801 Krungsri 83,165 4,995 91,577 5,274 Other — — 11,854 494 Total ¥ 1,262,339 ¥ 26,213 ¥ 1,260,791 ¥ 22,871 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. Troubled Debt Restructurings The following table summarizes the MUFG Group’s TDRs by class for the fiscal years ended March 31, 2019, 2020 and 2021: 2019 2020 2021 Troubled Debt Restructurings Pre- Post- Pre- Post- Pre- Post- (in millions) Commercial (1)(3) Domestic ¥ 36,693 ¥ 36,693 ¥ 61,735 ¥ 61,735 ¥ 39,282 ¥ 39,282 Foreign 5,692 5,692 39,827 39,827 33,839 33,839 Loans acquired with deteriorated credit quality 50 50 10,786 10,786 — — Residential (1)(3) 7,379 7,379 5,137 5,137 18,121 18,121 Card (2)(3) 19,685 18,837 22,625 21,561 20,857 19,737 MUAH (2)(3) 19,837 19,837 33,782 33,564 22,801 22,763 Krungsri (2)(3) 24,392 24,330 31,238 31,209 18,548 18,548 Other (2)(3) — — 12,781 12,780 24,968 24,956 Total ¥ 113,728 ¥ 112,818 ¥ 217,911 ¥ 216,599 ¥ 178,416 ¥ 177,246 2019 2020 2021 Troubled Debt Restructurings Recorded Investment (in millions) Commercial (1)(3) Domestic ¥ 11,002 ¥ 8,857 ¥ 16,179 Foreign — 2,337 9,861 Residential (1)(3) 362 31 157 Card (2)(3) 3,442 3,320 2,733 MUAH (2)(3) 349 4,656 3,437 Krungsri (2)(3) 7,926 7,305 6,226 Other (2)(3) — 15 857 Total ¥ 23,081 ¥ 26,521 ¥ 39,450 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, Krungsri and Other segments include accrual and nonaccrual loans. (3) For the fiscal year ended March 31, 2019, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment and forbearance was the primary concession type in the MUFG Americas Holdings segment. For the fiscal year ended March 31, 2020, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUFG Americas Holdings and Krungsri segments and reduction in the stated rate was the primary concession type in the Card and Other segments. For the fiscal year ended March 31, 2021, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment and forbearance was the primary concession type in the MUFG Americas Holdings segment. 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. 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, Krungsri and Other 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. The MUFG Group provided commitments to extend credit to customers with TDRs. The amounts of such commitments were ¥90,097 million and ¥130,788 million at March 31, 2020 and 2021, respectively. See Note 24 for further discussion of commitments to extend credit. In the MUFG Americas Holdings segment, TDR accounting was suspended for loan modifications that occurred from March 1, 2020, through June 30, 2020, where COVID-19 COVID-19 In the Krungsri segment, TDR accounting was suspended for loan modifications that occurred during the six months ended June 30, 2020, where COVID-19 Credit Quality Indicator Credit quality indicators of loans by class at March 31, 2020 are shown below: At March 31, 2020: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 49,695,889 ¥ 1,186,044 ¥ 220,245 ¥ 51,102,178 Foreign 34,719,041 636,523 128,073 35,483,637 Loans acquired with deteriorated credit quality 8,255 9,739 18,978 36,972 Total ¥ 84,423,185 ¥ 1,832,306 ¥ 367,296 ¥ 86,622,787 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 13,256,744 ¥ 61,746 ¥ 13,318,490 Card ¥ 504,357 ¥ 61,286 ¥ 565,643 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 4,590,805 ¥ 15,119 ¥ 4,877,863 ¥ 87,648 ¥ 84,033 ¥ 9,655,468 Performing Under- Non-Performing Total (1) (in millions) Krungsri ¥ 6,241,696 ¥ 508,847 ¥ 161,047 ¥ 6,911,590 Accrual Nonaccrual Total (1) (in millions) Other ¥ 1,086,517 ¥ 31,376 ¥ 1,117,893 Credit quality indicators of loans and fiscal year of origination by class at March 31, 2021 are shown below: Term Loans Revolving Revolving Total (1) At March 31, 2021: 2020 2019 2018 2017 2016 Prior (in millions) Commercial: ¥ 29,805,641 ¥ 10,256,709 ¥ 9,410,172 ¥ 5,360,221 ¥ 4,736,515 ¥ 6,945,092 ¥ 19,401,336 ¥ 9,776 ¥ 85,925,462 Domestic 22,402,694 6,392,946 6,126,746 3,840,964 3,649,145 5,286,408 6,934,308 — 54,633,211 Normal 21,936,776 6,058,126 5,915,318 3,666,734 3,551,332 4,847,597 6,604,586 — 52,580,469 Close Watch 431,223 319,073 195,630 162,176 74,698 317,622 306,236 — 1,806,658 Likely to become Bankrupt or Legally/Virtually Bankrupt 34,695 15,747 15,798 12,054 23,115 121,189 23,486 — 246,084 Foreign 7,402,947 3,863,763 3,283,426 1,519,257 1,087,370 1,658,684 12,467,028 9,776 31,292,251 Normal 7,158,793 3,704,240 3,155,261 1,423,064 1,032,052 1,534,943 12,231,018 9,776 30,249,147 Close Watch 200,305 118,027 91,867 60,422 51,433 69,436 197,405 — 788,895 Likely to become Bankrupt or Legally/Virtually Bankrupt 43,849 41,496 36,298 35,771 3,885 54,305 38,605 — 254,209 Residential ¥ 623,328 ¥ 847,314 ¥ 822,883 ¥ 892,166 ¥ 1,304,110 ¥ 8,660,022 ¥ 32,984 ¥ 8 ¥ 13,182,815 Accrual 623,035 846,787 822,411 891,407 1,302,427 8,599,621 30,897 — 13,116,585 Nonaccrual 293 527 472 759 1,683 60,401 2,087 8 66,230 Card ¥ 14 ¥ 96 ¥ 171 ¥ 304 ¥ 110 ¥ 513 ¥ 417,804 ¥ 60,284 ¥ 479,296 Accrual 1 10 13 19 7 79 404,301 14,666 419,096 Nonaccrual 13 86 158 285 103 434 13,503 45,618 60,200 MUAH (2) ¥ 1,406,996 ¥ 1,366,930 ¥ 915,570 ¥ 861,742 ¥ 770,568 ¥ 1,291,561 ¥ 1,882,377 ¥ — ¥ 8,495,744 Credit Quality Based on the Number of Delinquencies Accrual 472,892 608,580 324,369 552,380 516,051 656,087 130,514 — 3,260,873 Nonaccrual — 725 518 1,139 1,035 14,801 828 — 19,046 Credit Quality Based on Internal Credit Ratings Pass 920,959 707,841 486,354 287,316 236,715 542,634 1,625,799 — 4,807,618 Special Mention 4,865 31,361 49,784 14,904 9,522 30,015 76,487 — 216,938 Classified 8,280 18,423 54,545 6,003 7,245 48,024 48,749 — 191,269 Krungsri ¥ 1,316,031 ¥ 1,197,815 ¥ 958,241 ¥ 506,919 ¥ 285,427 ¥ 402,752 ¥ 1,922,946 ¥ 14,514 ¥ 6,604,645 Performing 1,251,246 1,086,710 855,915 434,818 241,811 314,114 1,754,840 — 5,939,454 Under-Performing 52,821 85,408 74,848 57,314 31,886 57,129 144,447 — 503,853 Non-Performing 11,964 25,697 27,478 14,787 11,730 31,509 23,659 14,514 161,338 Other ¥ 338,342 ¥ 164,650 ¥ 84,115 ¥ 37,394 ¥ 11,030 ¥ 8,538 ¥ 342,619 ¥ — ¥ 986,688 Accrual 335,830 159,363 79,608 35,366 10,556 8,201 331,197 — 960,121 Nonaccrual 2,512 5,287 4,507 2,028 474 337 11,422 — 26,567 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 FDIC covered loans which are not individually rated totaling ¥365 million and nil The MUFG Group classifies loans into risk categories based on relevant information about the ability of borrowers to service their debt, including, but not limited to, historical and current financial information, historical and current payment experience, credit documentation, public and non-public The primary credit quality indicator for loans within all classes of the Commercial segment is the internal credit rating assigned to each borrower based on the MUFG Group’s internal borrower ratings of 1 through 15, with the rating of 1 assigned to a borrower with the highest quality of credit. When assigning a credit rating to a borrower, the MUFG Group evaluates the borrower’s expected debt-service capability based on various information, including financial and operating information of the borrower as well as information on the industry in which the borrower operates, and the borrower’s business profile, management and compliance system. In evaluating a borrower’s debt-service capability, the MUFG Group also conducts an assessment of the level of earnings and an analysis of the borrower’s net worth. Based on the internal borrower rating, loans within the Commercial segment are categorized as Normal (internal borrower ratings of 1 through 9), Close Watch (internal borrower ratings of 10 through 12), and Likely to become Bankrupt or Legally/Virtually Bankrupt (internal borrower ratings of 13 through 15). Loans to borrowers categorized as Normal represent those that are not deemed to have collectibility issues. Loans to borrowers categorized as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons. Loans to borrowers categorized as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment, The accrual status is a primary credit quality indicator for loans within the Residential segment, the Card segment, the Other segment and consumer loans within the MUFG Americas Holdings segment. The accrual status of these loans is determined based on the number of delinquent payments. See Note 1 for further details of categorization of Accrual and Nonaccrual. Commercial loans within the MUFG Americas Holdings segment are categorized as either pass or criticized based on the internal credit rating assigned to each borrower. Criticized credits are those that are internally risk graded as Special Mention, Substandard or Doubtful. Special Mention credits are potentially weak, as the borrower has begun to exhibit deteriorating trends, which, if not corrected, may jeopardize repayment of the loan and result in further downgrade. Classified credits are those that are internally risk graded as Substandard or Doubtful. Substandard credits have well-defined weaknesses, which, if not corrected, could jeopardize the full satisfaction of the debt. A credit classified as Doubtful has critical weaknesses that make full collection improbable on the basis of currently existing facts and conditions. Loans within the Krungsri segment are categorized based on their delinquency status. Effective as of April 1, 2020, the category of the Krungsri segment’s credit quality indicator was changed to Performing, Under-Performing, and Non-Performing. Loans categorized as Under-Performing generally represent those that have significant increases in credit risk since origination, including, among other things, loans that are or more past due. The above table showing the loans within the Krungsri segment by credit quality indicator category as of March 31, 2020 has been restated based on the new categories. For the Commercial, Residential and Card segments, credit quality indicators are based on information as of March 31. For the MUFG Americas Holdings, Krungsri and Other segments, credit quality indicators are generally based on information as of December 31. Past Due Analysis Ages of past due loans by class at March 31, 2020 and 2021 are shown below: At March 31, 2020: 1-3 months Greater Total Current Total (1) 90 Days and (in millions) Commercial Domestic ¥ 9,215 ¥ 26,971 ¥ 36,186 ¥ 51,065,992 ¥ 51,102,178 ¥ 4,720 Foreign 9,927 23,548 33,475 35,450,162 35,483,637 164 Residential 48,404 15,443 63,847 13,248,278 13,312,125 6,288 Card 14,735 29,997 44,732 518,008 562,740 — MUAH 31,052 14,435 45,487 9,603,339 9,648,826 2,101 Krungsri 160,253 129,186 289,439 6,616,104 6,905,543 — Other 16,442 24,348 40,790 1,069,186 1,109,976 — Total ¥ 290,028 ¥ 263,928 ¥ 553,956 ¥ 117,571,069 ¥ 118,125,025 ¥ 13,273 At March 31, 2021: 1-3 months Greater Total Current Total (1) 90 Days and (in millions) Commercial Domestic ¥ 4,763 ¥ 22,996 ¥ 27,759 ¥ 54,605,452 ¥ 54,633,211 ¥ 4,673 Foreign 7,302 22,473 29,775 31,262,476 31,292,251 91 Residential 39,577 28,375 67,952 13,114,863 13,182,815 11,150 Card 2,127 26,786 28,913 450,383 479,296 — MUAH 42,082 29,337 71,419 8,424,325 8,495,744 4,626 Krungsri 131,573 127,533 259,106 6,345,539 6,604,645 — Other 21,776 24,201 45,977 940,711 986,688 — Total ¥ 249,200 ¥ 281,701 ¥ 530,901 ¥ 115,143,749 ¥ 115,674,650 ¥ 20,540 Note: (1) At March 31, 2020, 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. At March 31, 2021, 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. Allowance for Credit Losses Effective as of April 1, 2020, the MUFG Group adopted new guidance on measurement of credit losses on financial instruments. See Note 1 for more information. Changes in the allowance for credit losses by portfolio segment for the fiscal years ended March 31, 2019, 2020 and 2021 are shown below: Fiscal year ended March 31, 2019: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of fiscal year ¥ 491,098 ¥ 42,546 ¥ 32,119 ¥ 53,765 ¥ 144,596 ¥ 764,124 Provision for (reversal of) credit losses (43,850 ) (4,480 ) 23,809 9,277 49,574 34,330 Charge-offs 76,664 274 24,310 13,224 59,569 174,041 Recoveries collected 17,565 834 932 3,733 21,053 44,117 Net charge-offs 59,099 (560 ) 23,378 9,491 38,516 129,924 Other (1) 1,466 — — (970 ) (10,842 ) (10,346 ) Balance at end of fiscal year ¥ 389,615 ¥ 38,626 ¥ 32,550 ¥ 52,581 ¥ 144,812 ¥ 658,184 Fiscal year ended Commercial Residential Card MUAH Krungsri Other Total (in millions) Allowance for credit losses: Balance at beginning of fiscal year ¥ 389,615 ¥ 38,626 ¥ 32,550 ¥ 52,581 ¥ 144,812 ¥ — ¥ 658,184 Provision for (reversal of) credit losses 153,782 (1,028 ) 26,542 30,825 70,023 41,569 321,713 Charge-offs 85,326 3,227 25,149 27,934 77,907 23,592 243,135 Recoveries collected 26,427 375 1,237 4,173 23,170 8,476 63,858 Net charge-offs 58,899 2,852 23,912 23,761 54,737 15,116 179,277 Other (1) (2,223 ) — — (650 ) 9,528 2,265 8,920 Balance at end of fiscal year ¥ 482,275 ¥ 34,746 ¥ 35,180 ¥ 58,995 ¥ 169,626 ¥ 28,718 ¥ 809,540 Fiscal year ended Commercial Residential Card MUAH Krungsri Other Total (in millions) Allowance for credit losses: Balance at beginning of fiscal year ¥ 482,275 ¥ 34,746 ¥ 35,180 ¥ 58,995 ¥ 169,626 ¥ 28,718 ¥ 809,540 Effect of adopting new guidance on measurement of credit losses on financial instruments (2) 83,828 49,494 14,262 25,037 118,333 32,750 323,704 Provision for credit losses 235,584 1,385 17,876 90,064 90,167 49,134 484,210 Charge-offs 77,904 2,745 24,564 40,376 93,192 51,725 290,506 Recoveries collected 9,262 13 1,463 4,362 23,415 6,567 45,082 Net charge-offs 68,642 2,732 23,101 36,014 69,777 45,158 245,424 Other (1) 1,532 — — (6,327 ) (14,953 ) (3,891 ) (23,639 ) Balance at end of fiscal year ¥ 734,577 ¥ 82,893 ¥ 44,217 ¥ 131,755 ¥ 293,396 ¥ 61,553 ¥ 1,348,391 Notes: (1) Other is principally comprised of gains or losses from foreign exchange translation. (2) See Note 1 for more information. Allowance for credit losses and recorded investment in loans by portfolio At March 31, 2020: Commercial Residential Card MUAH Krungsri Other Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 364,079 ¥ 12,651 ¥ 19,799 ¥ 5,977 ¥ 30,198 ¥ 5,073 ¥ 437,777 Collectively evaluated for impairment 108,100 21,130 15,369 53,013 139,401 22,566 359,579 Loans acquired with deteriorated credit quality (2) 10,096 965 12 5 27 1,079 12,184 Total ¥ 482,275 ¥ 34,746 ¥ 35,180 ¥ 58,995 ¥ 169,626 ¥ 28,718 ¥ 809,540 Loans: Individually evaluated for impairment ¥ 944,988 ¥ 92,448 ¥ 65,292 ¥ 67,719 ¥ 98,959 ¥ 17,512 ¥ 1,286,918 Collectively evaluated for impairment 85,640,827 13,219,677 497,448 9,581,107 6,806,584 1,092,464 116,838,107 Loans acquired with deteriorated credit quality (2) 36,972 6,365 2,903 7,007 6,047 7,917 67,211 Total (1) ¥ 86,622,787 ¥ 13,318,490 ¥ 565,643 ¥ 9,655,833 ¥ 6,911,590 ¥ 1,117,893 ¥ 118,192,236 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) Loans acquired with deteriorated credit quality in the above table include impaired loans which are individually evaluated for impairment. Nonperforming loans were actively disposed of by sales during recent years. The allocated allowance for credit losses for such loans was removed from the allowance for credit losses and transferred to the valuation allowance for loans held for sale upon a decision to sell. Net charge-offs in the above table include a decrease from charge-offs in the allowance for credit losses amounting to ¥19.4 billion and ¥16.8 billion for the fiscal years ended March 31, 2020 and 2021, respectively, and an increase from recoveries in the allowance for credit losses amounting to ¥15.1 billion for the fiscal year ended March 31, 2019 due to loan disposal activity. The MUFG Group sold ¥1,769 billion, ¥2,136 billion and ¥1,684 billion of loans within the Commercial segment during the fiscal years ended March 31, 2019, 2020 and 2021, respectively. The MUFG Group sold ¥586 billion of loans within the MUFG Americas Holdings segment during the fiscal year ended March 31, 2021. The MUFG Group consolidates certain subsidiaries based on financial information for the year ended December 31 as this date and MUFG’s fiscal year which ends on March 31 have been treated as coterminous. For the fiscal year ended March 31, 2020, the effect of recording a provision for credit losses and a provision for off-balance COVID-19 , and off-balance , billion and would have resulted in a decrease of ¥ billion to net income attributable to Mitsubishi UFJ Financial Group. Collateral Dependent Loans The MUFG Group uses, as a practical expedient, the fair value of the collateral when recording the net carrying amounts of loans and determining the allowance for credit losses of such loans, for which the repayment is expected to be provided substantially through the operation or sale of the collateral, when the borrower is experiencing financial difficulty based on the assessment as of the reporting date. As of March 31, 2020 and 2021, for the Commercial, MUFG Americas Holdings, Krungsri and Other segments, collateral relating to these loans comprised primarily of real estate, and to a lesser extent, exchange traded equity securities and deposits etc. For the Residential segment, collateral on these loans was mainly real estate.

Premises and Equipment _Text Bl

Premises and Equipment [Text Block]	12 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Premises and Equipment [Text Block]	5. PREMISES AND EQUIPMENT Premises and equipment at March 31, 2020 and 2021 consisted of the following: 2020 2021 (in millions) Land ¥ 380,477 ¥ 379,560 Buildings 782,367 765,341 Equipment and furniture 623,676 564,273 Leasehold improvements 310,957 303,164 Construction in progress 35,594 46,513 Total 2,133,071 2,058,851 Less accumulated depreciation 1,203,542 1,183,859 Premises and equipment-net ¥ 929,529 ¥ 874,992 For the fiscal years ended March 31, 2019, 2020 and 2021, the MUFG Group recognized ¥31,345 million, ¥16,575 million and ¥11,424 million, respectively, of impairment losses for long-lived assets, primarily real estate which was either formerly used for its banking operations and is no longer used or real estate that is being used where recovery of the carrying amount is doubtful. In addition, ¥411 million, ¥194 million and ¥773million of impairment losses were recognized for real estate held for sale for the fiscal years ended March 31, 2019, 2020 and 2021, respectively. These losses are included in Other non-interest Impairment losses for the fiscal year ended March 31, 2019 included ¥21,096 million of losses on long-lived assets, including land, buildings, and equipment and furniture, which were held by certain consumer finance subsidiary. See Note 6 for the details of these impairments.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets [Text Block]	12 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets [Text Block]	6. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The table below presents the movement in the carrying amount of goodwill by business segment during the fiscal years ended March 31, 2020 and 2021: Global Global Asset Global Total (in millions) Balance at March 31, 2019: Goodwill ¥ 105,339 ¥ 490,883 ¥ 27,487 ¥ 2,300 ¥ 626,009 Accumulated impairment losses (2) — (177,750 ) (14,368 ) — (192,118 ) 105,339 313,133 13,119 2,300 433,891 Goodwill acquired during the fiscal year (1) 34,553 260,639 178,308 — 473,500 Impairment loss (32,868 ) (350,942 ) — — (383,810 ) Foreign currency translation adjustments and other (1,354 ) (12,877 ) 8,276 — (5,955 ) Balance at March 31, 2020: Goodwill 138,538 738,645 214,071 2,300 1,093,554 Accumulated impairment losses (32,868 ) (528,692 ) (14,368 ) — (575,928 ) ¥ 105,670 ¥ 209,953 ¥ 199,703 ¥ 2,300 ¥ 517,626 Goodwill acquired during the fiscal year (1) 1,105 — 4,164 — 5,269 Impairment loss (30,525 ) (117,039 ) — — (147,564 ) Foreign currency translation adjustments and other 456 (10,001 ) 5,066 — (4,479 ) Balance at March 31, 2021: Goodwill 140,099 728,644 223,301 2,300 1,094,344 Accumulated impairment losses (63,393 ) (645,731 ) (14,368 ) — (723,492 ) ¥ 76,706 ¥ 82,913 ¥ 208,933 ¥ 2,300 ¥ 370,852 Notes: (1) See Note 2 for the goodwill acquired in connection with acquisitions. (2) Effective April 1, 2018, the MUFG Group reorganized its business groups. Goodwill originally recognized for Retail Banking Business Group, Corporate Banking Business Group, Trust Assets Business Group and Global Business Group other than MUAH and Krungsri was ¥1,900,019 million, which has been fully impaired before April 1, 2017. As these impairment losses recorded in past before the reorganization of the segment and are irrelevant to the annual impairment test under the new segment, the accumulated impaired loss is not allocated to new business segments after the reorganization of business group. U.S. GAAP requires to test goodwill for impairment at least annually, or more frequently if events or changes in circumstances indicate that goodwill may be impaired, using a process that compares the carrying amount of a reporting unit with its fair value. An impairment loss is recognized to the extent that the carrying amount of a reporting unit exceeds its fair value, but not exceeding the total amount of goodwill allocated to that reporting unit. For the fiscal year ended March 31, 2019, there were no Danamon reporting unit within the Global Commercial Banking Business Group Segment, which is included in impairment of goodwill in the accompanying consolidated statements of income. In determining the acquisition price of Bank Danamon, the results of multiple valuation techniques were considered with an expectation to benefit from Danamon’s foothold in the developing local retail and SME segments to deepen its banking franchise in Indonesia. After the acquisition of Danamon by MUFG Bank, Danamon’s market capitalization decreased. As a result, the fair value of the reporting unit as an exit price was measured on June 30, 2019 for the quantitative goodwill impairment test, and led to impairment of goodwill as the fair value had fallen below the carrying amount of the reporting unit, including goodwill, reflecting a reduction in stock price as well as changes in the inputs to the valuation techniques in comparison to those considered in determining the acquisition price such as discount rate. The measurement of the fair value of the reporting unit was primarily based on a market approach, and was also corroborated by multiple valuation techniques. For the fiscal year ended March 31, 2020, the MUFG Group recognized ¥62,157 million of impairment of goodwill relating to Krungsri reporting unit within the Global Commercial Banking Business Group segment. The global economic slowdown led to slowing economic growth in Thailand and the decline of Krungsri’s stock price. As a result, the fair value of the reporting unit was measured on December 31, 2019 for the quantitative goodwill impairment test, and led to impairment of goodwill as the fair value had fallen below the carrying amount of the reporting unit. The measurement of the fair value of the reporting unit was primarily based on a market approach, and was also corroborated by multiple valuation techniques. For the fiscal year ended March 31, 2020, the MUFG Group recognized ¥80,297 million in impairment of goodwill relating to MUAH reporting unit within the Global Commercial Banking Business Group segment and Global Corporate & Investment Banking Business Group segment. Due to the decline in interest rates and slower growth than previously forecasted, cash flow projections for reporting units were lowered. The combination of these events led management to believe that the fair values of certain reporting units were below carrying value. As a result, the fair value of the reporting unit was measured on December 31, 2019 for the quantitative goodwill impairment test, and led to impairment of goodwill with the fair value fallen below the carrying amount of the reporting unit. The MUFG Group estimated the fair value of its reporting units using a combination of the income and the market approaches. The income approach estimates the fair value of the reporting units by discounting management’s projections of each reporting unit’s cash flows, including a terminal value to estimate the fair value of cash flows beyond the final year of projected results, using a discount rate derived from the Capital Asset Pricing Model. The market approach incorporates comparable public company price to tangible book value and price to earnings multiples. For the fiscal year ended March 31, 2021, the MUFG Group recognized ¥147,564 million in impairment of goodwill relating to MUAH reporting unit within the Global Commercial Banking Business Group segment and Global Corporate & Investment Banking Business Group segment. Due largely to increases in observed market discount rates, the fair values of the reporting units were lowered. This led management to believe that the fair values of certain reporting unit was below carrying value. As a result, the fair value of the reporting unit was measured for the quantitative goodwill impairment test, and led to impairment of goodwill with the fair value fallen below the carrying amount of the reporting unit. The MUFG Group estimated the fair value of its reporting units using a combination of the income and the market approaches. This goodwill impairment includes the impact of an intervening event due to economic environment triggered by COVID-19 The MUFG Group consolidates certain subsidiaries, including MUAH, based on financial information for the year ended December 31 as this date and MUFG’s fiscal year which ends on March 31 have been treated as coterminous. Other Intangible Assets The table below presents the gross carrying amount, accumulated amortization and net carrying amount, in total and by major class of other intangible assets at March 31, 2020 and 2021: 2020 2021 Gross Accumulated Net Gross Accumulated Net (in millions) Intangible assets subject to amortization: Software ¥ 2,852,273 ¥ 2,096,635 ¥ 755,638 ¥ 3,025,769 ¥ 2,249,340 ¥ 776,429 Customer relationships 567,886 264,636 303,250 555,796 290,641 265,155 Core deposit intangibles 174,802 100,022 74,780 164,979 102,958 62,021 Trade names 94,748 38,055 56,693 92,422 41,629 50,793 Other 17,374 5,769 11,605 16,136 5,640 10,496 Total ¥ 3,707,083 ¥ 2,505,117 1,201,966 ¥ 3,855,102 ¥ 2,690,208 1,164,894 Intangible assets not subject to amortization: Other (1) 37,560 20,100 Total ¥ 1,239,526 ¥ 1,184,994 Note: (1) Intangible assets not subject to amortization includes ¥29,641 million and ¥11,355 million of mortgage servicing rights accounted for at fair value at March 31, 2020 and 2021, respectively. Intangible assets subject to amortization acquired during the fiscal year ended March 31, 2020 amounted to ¥538,925 million, which primarily consisted of ¥291,821 million of software, ¥44,140 million of core deposit intangibles, ¥180,414 million of customer relationships and ¥16,402 million of trade names. The weighted average amortization periods for these assets are 5 years, 10 years, 17 years and 23 years, respectively. There is no significant residual value estimated for these assets. Intangible assets not subject to amortization acquired during the fiscal year ended March 31, 2020 amounted to ¥23,804 million. Intangible assets subject to amortization acquired during the fiscal year ended March 31, 2021 amounted to ¥255,336 million, which primarily consisted of ¥251,452 million of software and ¥3,765 million of customer relationships. The weighted average amortization periods for these assets are 5 years and 21 years, respectively. There is no significant residual value estimated for these assets. Intangible assets not subject to amortization acquired during the fiscal year ended March 31, 2021 amounted to ¥1,960 million. For the fiscal years ended March 31, 2019, 2020 and 2021, the MUFG Group recognized ¥118,108 million, ¥3,732 million and ¥21,680 million, respectively, of impairment losses for intangible assets whose carrying amounts exceeded their fair value. In computing the amount of impairment losses, fair value was determined primarily based on the present value of expected future cash flows, the estimated value based on appraisals, or market prices. The impairment loss for the fiscal year ended March 31, 2019 included a loss of ¥137,186 million relating to software held by certain consumer finance subsidiary under the Retail & Commercial Banking Business Group segment. The consumer finance subsidiary determined to fundamentally review its current system integration plan, comprehensively taking into account the scale, complexity and the degree of difficulty for the system development to respond rapid changes in payments market in an appropriate manner, at the meeting of the Board of Directors on March 25, 2019. The consumer finance subsidiary considered software under development unlikely to have cost reduction effect and remain in use in the future, and reevaluated the profitability of existing software in relation to its system integration plan. As a result, it was determined that carrying amounts of both system software under development and long lived assets group of credit business, including existing system software, land, buildings, and equipment and furniture exceeded their fair values, and ¥87,596 million and ¥28,494 million of impairment losses were recognized on system software under development and existing software, respectively. In computing the amount of impairment losses, the fair value was primarily estimated using an income approach. The income approach is based on the present value of expected cash flows, which represents market participant perspective. In addition to the impairments on software, ¥21,096 million of impairment losses on long-lived assets, including land, buildings, and equipment and furniture, were recognized. The estimated aggregate amortization expense for intangible assets for the next five fiscal years is as follows: (in millions) Fiscal year ending March 31: 2022 ¥ 267,181 2023 228,631 2024 193,748 2025 150,403 2026 100,619

Lease Transactions _Text Block_

Lease Transactions [Text Block]	12 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Lease Transactions [Text Block]	7. LEASE TRANSACTIONS Lease transactions as a lessee Right-of-use P remises and equipme million and Long-term deb million and . Right-of-use Other asset million and Other liabilitie million and For the fiscal year ended March 31, 2021, the MUFG Group recognized ¥56,424 million of impairment losses for Right-of-use assets of operating leases, where recovery of the carrying amount is doubtful. The losses are included in Other non-interest expenses. The discount rates used in determining the present value of leases are the MUFG Group’s incremental borrowing rate, developed based upon each lease’s term and currency of payment. The lease term includes options to extend or terminate the lease when it is reasonably certain that the MUFG Group will exercise that option. The MUFG Group has elected to exclude leases with original terms of less than one year from the operating lease right-of-use The following table presents profit or loss of lease transactions as a lessee for the fiscal years ended March 31, 2020 and 2021: 2020 2021 (in millions) Finance lease cost: Amortization of right-of-use ¥ 5,455 ¥ 4,971 Interest on lease liabilities 460 240 Operating lease cost 99,939 91,276 The following table presents information of lease transactions as a lessee for the fiscal years ended March 31, 2020 and 2021: 2020 2021 (in millions, except years and Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases ¥ 482 ¥ 331 Operating cash flows from operating leases 106,103 102,982 Financing cash flows from finance leases 7,090 7,709 Right-of-use 12,754 3,487 Right-of-use assets obtained in exchange for new operating lease liabilities 46,482 50,564 Weighted-average remaining lease term: Finance leases 4.4 years 4.1 years Operating leases 9.5 years 8.3 years Weighted-average discount rate: Finance leases 0.99 % 0.87 % Operating leases 1.16 % 0.97 % Maturities of lease liabilities as of March 31, 2021 are as follows: Finance Operating (in millions) 2022 ¥ 7,550 ¥ 106,423 2023 5,397 81,112 2024 3,735 60,525 2025 1,585 51,303 2026 748 41,089 2027 and thereafter 2,090 163,125 Total undiscounted cash flows 21,105 503,577 Difference between undiscounted and discounted cash flows (968 ) (27,473 ) Amount on balance sheet ¥ 20,137 ¥ 476,104 Lease transactions as a lessor As part of its financing activities, the MUFG Group enters into leasing arrangements with customers. The MUFG Group’s leasing operations are conducted through leasing subsidiaries and consist principally of various types of data processing equipment, office equipment and transportation equipment. Sales type and direct financing lease are presented in loans. In certain case, the MUFG Group requests lessees to deposit in advance an amount nearly equal or equal to the residual value of leased assets. The following table presents profit or loss of lease transactions as a lessor for the fiscal years ended March 31, 2020 and 2021: 2020 2021 (in millions) Sales type and direct financing leases: Finance income on net investment ¥ 119,010 ¥ 122,810 Operating leases: Lease income 7,856 3,663 Total ¥ 126,866 ¥ 126,473 Finance income on net investment is included in Interest income—Loans, including fees in the consolidated statements of income. Lease income from operating lease transactions is included in Other non-interest The following table presents the components of sales type and direct financing leases transactions as of March 31, 2020 and 2021. 2020 2021 (in millions) Lease receivables (undiscounted) ¥ 2,193,360 ¥ 1,913,852 Adjustments: Discounted unguaranteed residual value 15,515 15,435 Initial direct cost on sales type and direct financing leases 29,562 27,869 Deferred selling profit (364,206 ) (313,784 ) Net investment in sales type and direct financing leases ¥ 1,874,231 ¥ 1,643,372 The following table presents maturity of the lease payment receivables of sales type and direct financing lease transactions as of March 31, 2021: Lease (in millions) 2022 ¥ 460,067 2023 417,653 2024 352,767 2025 270,563 2026 188,168 2027 and thereafter 224,634 Total undiscounted cash flows 1,913,852 Difference between undiscounted cash flows and the lease receivables recognized on balance sheet (270,480 ) Amount on balance sheet ¥ 1,643,372

Income Taxes _Text Block_

Income Taxes [Text Block]	12 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes [Text Block]	8. INCOME TAXES Income before Income Tax Expense Income before income tax expense by jurisdiction for the fiscal years ended March 31, 2019, 2020 and 2021 was as follows: 2019 2020 2021 (in millions) Domestic income ¥ 228,018 ¥ 89,440 ¥ 575,101 Foreign income 642,824 343,780 1,033,241 Total ¥ 870,842 ¥ 433,220 ¥ 1,608,342 Income Tax Expense (Benefit) The detail of current and deferred income tax expense (benefit) for the fiscal years ended March 31, 2019, 2020 and 2021 was as follows: 2019 2020 2021 (in millions) Current: Domestic ¥ 57,303 ¥ 28,128 ¥ 95,183 Foreign 123,730 147,344 83,492 Total 181,033 175,472 178,675 Deferred: Domestic (32,746 ) (18,949 ) 310,490 Foreign (15,050 ) (42,018 ) (44,217 ) Total (47,796 ) (60,967 ) 266,273 Income tax expense 133,237 114,505 444,948 Income tax expense (benefit) reported in Accumulated OCI relating to: Investment securities 15,590 (29,747 ) 1,146 Debt valuation adjustments 4,293 23,908 (36,792 ) Derivatives qualifying for cash flow hedges (1,845 ) 4,012 12,244 Defined benefit plans (38,229 ) (57,685 ) 139,883 Foreign currency translation adjustments 15,148 (20,693 ) (3,368 ) Total (5,043 ) (80,205 ) 113,113 Total ¥ 128,194 ¥ 34,300 ¥ 558,061 The MUFG Group files tax returns on a consolidated basis for corporate income taxes within Japan. A consolidated basis for corporate income taxes results in the reporting of taxable income or loss based upon the combined profits or losses of the parent company and its wholly-owned domestic subsidiaries. Reconciliation of Effective Income Tax Rate Income taxes in Japan applicable to the MUFG Group are imposed by the national, prefectural and municipal governments, and in the aggregate resulted in a normal effective statutory rate of approximately 30.6%, 30.6%, and 30.6% for the fiscal years ended March 31, 2019, 2020 and 2021, respectively. Foreign subsidiaries are subject to income taxes of the countries in which they operate. A reconciliation of the effective income tax rates reflected in the accompanying consolidated statements of income to the combined normal effective statutory tax rates for the fiscal years ended March 31, 2019, 2020 and 2021 is as follows: 2019 2020 2021 Combined normal effective statutory tax rate 30.6 % 30.6 % 30.6 % Nondeductible expenses 0.5 1.2 0.3 Impairment of goodwill — 26.1 2.4 Foreign tax credit and payments (3.3 ) (9.2 ) (0.9 ) Lower tax rates applicable to income of subsidiaries (2.5 ) (3.2 ) (1.0 ) Change in valuation allowance (1.4 ) 7.9 (0.9 ) Realization of previously unrecognized tax effects of subsidiaries — (19.8 ) (1) 0.0 Nontaxable dividends received (9.1 ) (15.6 ) (1.9 ) Undistributed earnings of subsidiaries 0.6 3.6 0.0 Tax and interest expense for uncertainty in income taxes 0.6 0.0 (0.1 ) Noncontrolling interest income (loss) 0.2 (0.1 ) 0.1 Effect of changes in tax laws 0.0 — (0.1 ) Expiration of loss carryforward 0.1 1.9 0.1 Other—net (1.0 ) 3.0 (0.9 ) Effective income tax rate 15.3 % 26.4 % 27.7 % Note: (1) In October 2019, a wholly owned subsidiary of the MUFG Group was sold. The sale resulted in the realization of tax benefits that were not previously recognized as deferred tax assets, resulting in a ¥85,588 million reduction of income tax expense and a 19.8 Deferred Tax Assets and Liabilities Deferred tax assets and liabilities are computed for each tax jurisdiction using currently e 2020 2021 (in millions) Deferred tax assets: Allowance for credit losses ¥ 317,770 ¥ 462,369 Operating loss carryforwards 94,326 97,844 Loans 2,022 790 Accrued liabilities and other 277,807 300,942 Premises and equipment 150,116 117,322 Derivative financial instruments 96,761 69,039 Defined benefit plans 57,836 — Obligations under operating leases 133,812 132,443 Valuation allowance (151,530 ) (137,503 ) Total deferred tax assets 978,920 1,043,246 2020 2021 (in millions) Deferred tax liabilities: Investment securities (including trading account assets at fair value under the fair value option) 788,614 1,017,131 Intangible assets 87,063 70,575 Lease transactions 54,349 48,519 Defined benefit plans — 81,282 Investments in subsidiaries and affiliates 279,583 338,713 Right-of-use 106,995 100,260 Other 90,653 92,306 Total deferred tax liabilities 1,407,257 1,748,786 Net deferred tax assets (liabilities) ¥ (428,337 ) ¥ (705,540 ) The valuation allowance was provided primarily against deferred tax assets recorded at MUFG and its subsidiaries with operating loss carryforwards. The valuation allowance is determined to reduce the measurement of deferred tax assets not expected to be realized. Management considers all available evidence, both positive and negative, to determine whether the valuation allowance is necessary based on the weight of that evidence. Management determines the amount of the valuation allowance based on future reversals of existing taxable temporary differences and future taxable income exclusive of reversing temporary differences. Future taxable income is developed from forecasted operating results, based on recent historical trends and approved business plans, the eligible carryforward periods and other relevant factors. For certain subsidiaries where strong negative evidence exists, such as the existence of significant amounts of operating loss carryforwards, cumulative losses and the expiration of unused operating loss carryforwards in recent years, a valuation allowance was recognized against the deferred tax assets as of March 31, 2020 and 2021 to the extent that it is more likely than not that they will not be realized. Income taxes are not provided on undistributed earnings of certain foreign subsidiaries that are considered to be indefinitely reinvested in the operations of such subsidiaries. At March 31, 2020 and 2021, the undistributed earnings of such foreign subsidiaries amounted to approximately ¥67,791 million and ¥105,934 million, respectively. Determination of the amount of unrecognized deferred tax liabilities with respect to these undistributed earnings is not practicable because of the complexity associated with its hypothetical calculation including foreign withholding taxes and foreign tax credits. MUFG has neither the plan nor the intention to dispose of investments in such foreign subsidiaries and, accordingly, does not expect to record capital gains or losses, or otherwise monetize the undistributed earnings of such foreign subsidiaries. Furthermore, under the Japanese tax law, 95% of a dividend received from a foreign company in which a domestic company has held generally at least 25% of the outstanding shares for a continuous period of six months or more ending on the date on which the dividend is declared can be excluded from the domestic company’s taxable income. Therefore, if undistributed earnings of certain foreign subsidiaries are repatriated through dividends, only 5% of the amount of dividends will be included in taxable income. Operating Loss and Tax Credit Carryforwards At March 31, 2021, the MUFG Group had operating loss carryforwards for corporate tax of ¥213,108 million and tax credit carryforwards of ¥62,184 million for tax purposes. Such carryforwards, if not utilized, are scheduled to expire as follows: Operating loss Tax credit (in millions) Fiscal year ending March 31: 2022 ¥ 15,457 ¥ 650 2023 5,575 8,191 2024 5,209 6,705 2025 84,080 10 2026 59,047 37 2027 1,722 70 2028 and thereafter 17,288 41,756 No definite expiration date 24,730 4,765 Total ¥ 213,108 ¥ 62,184 Uncertainty in Income Tax The following is a roll-forward of the MUFG Group’s unrecognized tax benefits for the fiscal years ended March 31, 2019, 2020 and 2021: 2019 2020 2021 (in millions) Balance at beginning of fiscal year ¥ 12,917 ¥ 19,160 ¥ 19,249 Gross amount of increases for current year’s tax positions 313 399 202 Gross amount of decreases for current year’s tax positions — — (1,919 ) Gross amount of increases for prior years’ tax positions 8,836 212 489 Gross amount of decreases for prior years’ tax positions (1,090 ) — (2,329 ) Net amount of changes relating to settlements with tax authorities — (81 ) — Decreases due to lapse of applicable statutes of limitations (1,540 ) (297 ) (116 ) Foreign exchange translation and other (276 ) (144 ) (1,747 ) Balance at end of fiscal year ¥ 19,160 ¥ 19,249 ¥ 13,829 The MUFG Group classifies interest and penalties, if applicable, related to income taxes as Income tax expense. Accrued interest and penalties (not included in the “unrecognized tax benefits” above) are a component of Other liabilities. The following is a roll-forward of the interest and penalties recognized in the accompanying consolidated financial statements for the fiscal years ended March 31, 2019, 2020 and 2021: 2019 2020 2021 (in millions) Balance at beginning of fiscal year ¥ 4,564 ¥ 3,056 ¥ 2,612 Total interest and penalties in the consolidated statements of income (1,655 ) (398 ) (398 ) Total cash settlements, foreign exchange translation and other 147 (46 ) 203 Balance at end of fiscal year ¥ 3,056 ¥ 2,612 ¥ 2,417 The MUFG Group is subject to ongoing tax examinations by the tax authorities of the various jurisdictions in which it operates. The following are the major tax jurisdictions in which the MUFG Group operates and the status of years under audit or open to examination: Jurisdiction Tax years Japan 2020 and forward United States—Federal 2017 and forward United States—California 2015 and forward Indonesia 2017 and forward The MUFG Group is currently under continuous examinations by the tax authorities in various domestic and foreign jurisdictions and many of these examinations are resolved every year. The unrecognized tax benefits will decrease since resolved items will be removed from the balance regardless of whether their resolution results in payment or recognition. It is reasonably possible that the unrecognized tax benefits will not increase or decrease during the next twelve months.

Pledged Assets and Collateral _

Pledged Assets and Collateral [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Pledged Assets and Collateral [Text Block]	9. PLEDGED ASSETS AND COLLATERAL Pledged Assets At March 31, 2021, assets mortgaged, pledged, or otherwise subject to lien were as follows: 2021 (in millions) Trading account securities ¥ 9,966,574 Investment securities 20,250,998 Loans 12,289,789 Other 23,745 Total ¥ 42,531,106 The above pledged assets were classified by type of liabilities to which they related as follows: 2021 (in millions) Deposits ¥ 138,491 Payables under repurchase agreements and securities lending transactions 13,118,547 Other short-term borrowings and long-term debt 29,243,996 Other 30,072 Total ¥ 42,531,106 At March 31, 2021, certain investment securities, principally Japanese national government and Japanese government agency bonds, loans, and other assets with a combined carrying value of ¥20,818,106 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 Under Japanese law, Japanese banks are required to maintain certain reserves on deposit with the Bank of Japan based on the amount of deposit balances and certain other factors. There are similar reserve deposit requirements for foreign offices and subsidiaries engaged in banking businesses in foreign countries. At March 31, 2020 and 2021 the reserve funds required to be maintained by the MUFG Group, which are included in Cash and due from banks and Interest-earning deposits in other banks, were ¥2,606,464 million and ¥2,881,778 million, respectively. Collateral The MUFG Group accepts and provides financial assets as collateral for transactions, principally commercial loans, repurchase agreements and securities lending transactions, call money, and derivatives. Financial assets eligible for such collateral include, among others, marketable equity securities, trade and notes receivable and CDs. Secured parties, including creditors and counterparties to certain transactions with the MUFG Group, may sell or repledge financial assets provided as collateral. Certain contracts, however, may not be specific about the secured party’s right to sell or repledge collateral under the applicable statutes and, therefore, whether or not the secured party is permitted to sell or repledge collateral would differ depending on the interpretations of specific provisions of the existing statutes, contract or certain market practices. If the MUFG Group determines, based on available information, that a financial asset provided as collateral might not be sold or repledged by the secured parties, such collateral is not separately reported in the accompanying consolidated balance sheets. If a secured party is permitted to sell or repledge financial assets provided as collateral by contract or custom under the existing statutes, the MUFG Group reports such pledged financial assets separately on the face of the accompanying consolidated balance sheets. At March 31, 2021, the MUFG Group pledged ¥47,853 billion of assets that may not be sold or repledged by the secured parties. Certain banking subsidiaries accept collateral for commercial loans and certain banking transactions under a standardized agreement with customers, which provides that these banking subsidiaries may require the customers to provide collateral or guarantees with respect to the loans and other banking transactions. Financial assets pledged as collateral are generally negotiable and transferable instruments, and such negotiability and transferability are authorized by applicable legislation. In principle, Japanese legislation permits these banking subsidiaries to repledge financial assets accepted as collateral unless otherwise prohibited by contract or relevant statutes. Nevertheless, the MUFG Group did not sell or repledge nor does it plan to sell or repledge such collateral accepted in connection with commercial loans before a debtor’s default or other credit events specified in the agreements as it is not customary within the banking industry in Japan to dispose of collateral before a debtor’s default and other specified credit events. Derivative agreements commonly used in the marketplace do not prohibit a secured party’s disposition of financial assets received as collateral, and in resale agreements and securities borrowing transactions, securities accepted as collateral may be sold or repledged by the secured parties. At March 31, 2020 and 2021, the fair value of the collateral accepted by the MUFG Group that is permitted to be sold or repledged was ¥38,858 billion and ¥30,983 billion, respectively, of which ¥32,095 billion and ¥23,478 billion, respectively, was sold or repledged. At March 31, 2020 and 2021, the cash collateral pledged for derivative transactions, which is included in Other assets, was ¥1,696,108 million and ¥2,005,136 million, respectively, and the cash collateral received for derivative transactions, which is included in Other liabilities, was ¥1,125,305 million and ¥909,641 million, respectively.

Deposits _Text Block_

Deposits [Text Block]	12 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Deposits [Text Block]	10. DEPOSITS The balances of time deposits, including CDs, issued in amounts of ¥10 million (approximately U.S.$ 90 thousand at the Federal Reserve Bank of New York’s noon buying rate on March 31, 2021) or more with respect to domestic deposits and issued in amounts of U.S.$100,000 or more with respect to foreign deposits were ¥23,957,076 million and ¥23,329,855 million, respectively, at March 31, 2020, and ¥25,219,926 million and ¥23,673,512 million, respectively, at March 31, 2021. The maturity information at March 31, 2021 for domestic and foreign time deposits, including CDs, is summarized as follows: Domestic Foreign (in millions) Due in one year or less ¥ 32,811,126 ¥ 23,871,425 Due after one year through two years 4,345,312 460,277 Due after two years through three years 2,454,117 204,050 Due after three years through four years 610,596 109,874 Due after four years through five years 668,397 31,178 Due after five years 757,934 68,309 Total ¥ 41,647,482 ¥ 24,745,113

Call Money and Funds Purchased

Call Money and Funds Purchased [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Call Money and Funds Purchased [Text Block]	11. CALL MONEY AND FUNDS PURCHASED A summary of funds transactions for the fiscal years ended March 31, 2020 and 2021 is as follows: 2020 2021 (in millions, except percentages and days) Outstanding at end of fiscal year: Amount ¥ 3,668,922 ¥ 2,353,830 Principal range of maturities 1 1 Weighted average interest rate 0.04 % 0.04 %

Due to Trust Account, Short-ter

Due to Trust Account, Short-term Borrowings and Long-term Debt [Text Block]	12 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Due to Trust Account, Short-term Borrowings and Long-term Debt [Text Block]	12. DUE TO TRUST ACCOUNT, SHORT-TERM BORROWINGS AND LONG-TERM DEBT Mitsubishi UFJ Trust and Banking holds assets on behalf of its customers in an agent, fiduciary or trust capacity. Such trust account assets are not the MUFG Group’s proprietary assets and are managed and accounted for separately. However, excess cash funds of individual trust accounts are often placed with Mitsubishi UFJ Trust and Banking which manages the funds together with its own funds in its proprietary account. Due to trust account reflects a temporary placement of the excess funds from individual trust accounts and, in view of the MUFG Group’s funding, due to trust account is similar to short-term funding, including demand deposits and other overnight funds purchased. The balance changes in response to the day-to-day 2020 2021 (in millions, except percentages) Amount outstanding at end of fiscal year ¥ 3,377,747 ¥ 3,891,831 Weighted average interest rate on outstanding balance at end of fiscal year 0.00 % 0.00 % At March 31, 2020 and 2021, the MUFG Group had unused lines of credit for financing amounting to ¥7,519,582 million and ¥4,408,245 million, respectively. The amounts principally consist of pooled collateral which are used to cover shortages in the Bank of Japan account and to meet liquidity needs. The MUFG Group may borrow from the Bank of Japan on demand up to the total amount of collateral eligible for credit extension Other short-term borrowings at March 31, 2020 and 2021 were comprised of the following: 2020 2021 (in millions, except percentages) Domestic offices: Commercial paper ¥ 1,160,758 ¥ 1,207,610 Borrowings from the Bank of Japan 9,800,800 9,238,209 Borrowings from other financial institutions 191,453 141,060 Other 170,044 126,060 Total domestic offices 11,323,055 10,712,939 Foreign offices: Commercial paper 3,836,459 3,281,866 Borrowings from other financial institutions 631,502 113,874 Short-term debentures 24,009 7,775 Other 241,168 71,306 Total foreign offices 4,733,138 3,474,821 Total 16,056,193 14,187,760 Less unamortized discount 711 37 Other short-term borrowings—net ¥ 16,055,482 ¥ 14,187,723 Weighted average interest rate on outstanding balance at end of fiscal year 0.67 % 0.06 % Long-term debt (with original maturities of more than one year) at March 31, 2020 and 2021 was comprised of the following: 2020 2021 (in millions) MUFG: Obligations under finance ¥ 6,552 ¥ 4,989 Unsubordinated debt (1) Fixed rate bonds, payable in US dollars, due 2021-2039, principally 0.85%-4.29% 3,864,822 4,224,401 Fixed rate bonds, payable in Euro, due 2023-2033, principally 0.34%-1.75% 408,825 482,856 Fixed rate bonds, payable in other currencies, due 2024-2029, principally 2.08%-4.05 % (2 ) 28,382 34,262 Floating rate bonds, payable in US dollars, due 2021-2023, principally 0.87%-1.24% 734,254 669,464 Floating rate bonds, payable in Euro, due 2023, principally 0.01% 41,843 45,430 Floating rate bonds, payable in other currencies, due 2024, principally 1.26% (2) 26,436 33,744 Total 5,104,562 5,490,157 Subordinated debt (1) Fixed rate bonds, payable in Japanese yen, due 2024-2031, principally 0.37%-1.39% 685,663 776,886 Adjustable rate bonds, payable in Japanese yen, due 2026-2031, principally 0.29%-0.58% 1,043,336 1,072,209 Adjustable rate bonds, payable in Japanese yen, no stated maturity, principally 0.82%-2.50% 1,756,087 1,704,816 Adjustable rate borrowings, payable in Japanese yen, due 2028-2029, principally 0.30%-0.46% 47,500 31,500 Adjustable rate borrowings, payable in Japanese yen, no stated maturity, principally 0.85%-1.17% 66,649 87,085 Floating rate bonds, payable in Japanese yen, no stated maturity, principally 3.02% 3,500 — Floating rate borrowings, payable in Japanese yen, due 2025-2028, principally 0.57%-0.79% 86,000 86,000 Total 3,688,735 3,758,496 Total 8,799,849 9,253,642 MUFG Bank: Obligations under finance ¥ 5,636 ¥ 4,628 Unsubordinated debt (1) Fixed rate bonds, payable in Japanese yen, due 2021-2027, principally 0.36%-2.34% 141,700 123,300 Fixed rate bonds, payable in US dollars, due 2021-2050, principally 0.00%-4.70% 1,104,504 1,041,115 Fixed rate bonds, payable in Euro, due 2022-2033, principally 0.88%-1.81% 108,252 109,619 Fixed rate bonds, payable in other currencies, due 2047, principally 0.00% (2) 17,620 3,100 Fixed rate borrowings, payable in Japanese yen, due 2021-2028, principally 0.00%-0.25% 10,440,217 18,689,074 Fixed rate borrowings, payable in US dollars, due 2030, principally 2.93% 8,367 7,833 Floating rate borrowings, payable in US dollars, due 2021-2031, principally 0.20%-4.11% 897,170 721,941 Floating rate borrowings, payable in Euro, due 2021-2036, principally 0.00%-0.40% 102,123 111,611 Total 12,819,953 20,807,593 Subordinated debt (1) Fixed rate bonds, payable in Japanese yen, due 2021-2031, principally 1.39%-2.91% 490,590 350,900 Fixed rate borrowings, payable in Japanese yen, due 2022-2035, principally 0.31%-2.24% 73,400 73,400 Adjustable rate borrowings, payable in Japanese yen, due 2028, principally 0.98% 12,000 10,000 Adjustable rate borrowings, payable in Japanese yen, no stated maturity, principally 2.67%-3.52% 13,500 — Floating rate borrowings, payable in Japanese yen, due 2027, principally 0.12% 15,000 15,000 Total 604,490 449,300 Obligations under loan securitization transaction accounted for as secured borrowings due 2021-2080, principally 0.11%-8.00% 791,139 618,072 Total 14,221,218 21,879,593 2020 2021 (in millions) Other subsidiaries: Obligations under finance leases ¥ 12,998 ¥ 10,520 Unsubordinated debt (1) Fixed rate borrowings, bonds and notes, payable in Japanese yen, due 2021-2051, principally 0.00%-56.00% 940,691 878,276 Fixed rate borrowings, bonds and notes, payable in US dollars, due 2021-2036, principally 0.00%-57.00% 1,106,465 885,950 Fixed rate borrowings, bonds and notes, payable in Euro, due 2021-2030, principally 0.00%-0.26% 2,965 2,719 Fixed rate borrowings, bonds and notes, payable in Thai baht, due 2021-2027, principally 0.00%-7.15% 387,799 349,666 Fixed rate borrowings, bonds and notes, payable in other currencies, due 2021-2037, principally 0.00%-10.25% (2) 360,558 320,663 Floating/Adjustable rate borrowings, bonds and notes, payable in Japanese yen, due 2021-2051, principally 0.00%-65.00% 1,259,427 1,007,882 Floating rate borrowings, bonds and notes, payable in US dollars, due 2021-2030, principally 0.00%-60.00% 378,217 174,997 Floating rate borrowings, bonds and notes, payable in Euro, due 2021-2023, principally 0.00%-4.00% 835 1,092 Floating/Adjustable rate borrowings, bonds and notes, payable in other currencies, due 2020-2024, principally 0.00%-7.30% (2) 6,804 — Total 4,443,761 3,621,245 Subordinated debt (1) Fixed rate borrowings, bonds and notes, payable in Japanese yen, due 2021-2030, principally 1.36%-2.61% 223,095 184,894 Fixed rate borrowings, bonds and notes, payable in US dollars, due 2022-2030, principally 7.50%-9.90% 737 1,212 Fixed rate borrowings, bonds and notes, payable in Thai baht, due 2027-2029, principally 3.40%-3.90% 220,756 209,189 Fixed rate borrowings, bonds and notes, payable in other currencies, due 2021, principally 0.00% (2) 7,179 6,915 Floating rate borrowings, bonds and notes, payable in Japanese yen, due 2021, principally 0.73% 2,000 — Floating rate borrowings, bonds and notes, payable in US dollars, due 2036, principally 1.95% 4,575 3,820 Total 458,342 406,030 Obligations under loan securitization transaction accounted for as secured borrowings due 2021-2022, principally 1.84%-2.25% 6,453 11 Total 4,921,554 4,037,806 Total 27,942,621 35,171,041 Debt issuance cost ¥ (15,858) ¥ (13,390) Total ¥ 27,926,763 ¥ 35,157,651 Notes: (1) Adjustable rate debts are debts where interest rates are reset in accordance with the terms of the debt agreements, and floating rate debts are debts where interest rates are repriced in accordance with movements of markets indices. (2) Minor currencies, such as Australian dollar, British pound, Indonesian rupiah, Brazilian real, Russian ruble etc., excluding Japanese yen, US dollars, Euro and Thai baht have been summarized into the “Other currencies” classification. The MUFG Group uses derivative financial instruments to manage its interest rate and currency exposures for certain debts. The derivative financial instruments include swaps, forwards, options and other types of derivatives. As a result of these derivative instruments, the effective rates reflected in the table above may differ from the coupon rates. The interest rates for the adjustable and floating rate debt shown in the above table are those in effect at March 31, 2020 and 2021. Certain debt agreements permit the MUFG Group to redeem the related debt, in whole or in part, prior to maturity at the option of the issuer on terms specified in the respective agreements. The following is a summary of maturities of long-term debt subsequent to March 31, 2021: MUFG BK Other Total (in millions) Fiscal year ending March 31: 2022 ¥ 792,201 ¥ 2,014,430 ¥ 1,065,677 ¥ 3,872,308 2023 896,760 644,383 1,025,627 2,566,770 2024 752,246 1,073,761 558,907 2,384,914 2025 979,603 16,530,494 272,391 17,782,488 2026 513,597 181,556 195,186 890,339 2027 and thereafter 5,319,235 1,434,969 920,018 7,674,222 Total ¥ 9,253,642 ¥ 21,879,593 ¥ 4,037,806 ¥ 35,171,041 New Issuances of Bonds for Basel III For the fiscal year ended March 31, 2021, the MUFG Group issued to institutional investors in Japan ¥60,000 million aggregate principal amount of unsecured perpetual subordinated Additional Tier 1 notes. These notes are subject to the MUFG Group’s discretion to cease interest payments and a write-down of the principal upon the occurrence of certain events, including when the MUFG Group’s Common Equity Tier 1 ratio declines below 5.125%, when the MUFG Group is deemed to be at risk of becoming non-viable For the fiscal year ended March 31, 2021, the MUFG Group issued $4,500 million (approximately ¥498,195 million), €500 million (approximately ¥64,900 million) of bonds with an intent to count towards Total Loss-Absorbing Capacity (“TLAC”) to global institutional investors to meet the TLAC requirement under the standards issued by the Financial Stability Board. The MUFG Group is required to maintain external TLAC ratios of 16% on a risk-weighted assets basis and 6% on a leverage exposure basis as of March 31, 2021 and 18% on a risk-weighted assets basis and 6.75% on a leverage exposure basis from March 31, 2022.

Severance Indemnities and Pensi

Severance Indemnities and Pension Plans [Text Block]	12 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Severance Indemnities and Pension Plans [Text Block]	13. SEVERANCE INDEMNITIES AND PENSION PLANS Defined Benefit Pension Plans The MUFG Group has funded non-contributory MUFG Bank and certain domestic subsidiaries, Mitsubishi UFJ Trust and Banking, Mitsubishi UFJ Securities Holdings, Mitsubishi UFJ NICOS and some subsidiaries of MUFG have non-contributory The MUFG Group also offers qualified and nonqualified defined benefit pension plans in foreign offices and subsidiaries for their employees. The qualified plans are non-contributory provide benefits upon retirement based on years of service and average compensation and cover substantially all of the employees of such foreign offices and subsidiaries. With respect to the offices and subsidiaries in the United States of America, the qualified plans are funded on a current basis in compliance with the requirement of the Employee Retirement Income Security Act of the United States of America. The nonqualified plans are non-contributory Severance Indemnities Plans The MUFG Group has SIPs under which their employees in Japan, other than those who are directors, are entitled, under most circumstances, upon mandatory retirement at normal retirement age or earlier termination of employment, to lump-sum lump-sum Other Postretirement Plans The MUFG Group’s foreign offices and subsidiaries, primarily in the United States of America, provide their employees with certain postretirement medical and life insurance benefits (“other benefits”). Net periodic cost of pension benefits and other benefits for the fiscal years ended March 31, 2019, 2020 and 2021 include the following components: Domestic subsidiaries Foreign offices and subsidiaries 2019 2020 2021 2019 2020 2021 Pension Pension Pension Pension Other Pension Other Pension Other (in millions) Service cost—benefits earned during the fiscal year ¥ 48,352 ¥ 49,194 ¥ 46,861 ¥ 12,395 ¥ 525 ¥ 14,406 ¥ 366 ¥ 13,947 ¥ 229 Interest cost on projected benefit obligation 13,504 10,969 11,091 14,958 1,046 17,370 1,159 14,295 793 Expected return on plan assets (74,270 ) (74,744 ) (71,078 ) (33,266 ) (2,314 ) (31,382 ) (1,882 ) (31,161 ) (2,118 ) Amortization of net actuarial loss 731 5,641 17,019 9,993 707 8,685 1,162 11,560 208 Amortization of prior service cost (1,210 ) (1,204 ) (1,205 ) (3,039 ) (2,020 ) (2,633 ) (1,881 ) (2,614 ) (448 ) Loss (gain) on settlements and curtailment (5,980 ) (2,366 ) (4,605 ) 49 — 223 — 30 — Net periodic benefit cost (income) ¥ (18,873 ) ¥ (12,510 ) ¥ (1,917 ) ¥ 1,090 ¥ (2,056 ) ¥ 6,669 ¥ (1,076 ) ¥ 6,057 ¥ (1,336 ) The following table summarizes the assumptions used in computing the present value of the projected benefit obligations and the net periodic benefit cost: Domestic subsidiaries Foreign offices and subsidiaries 2019 2020 2021 2019 2020 2021 Pension Pension Pension Pension Other Pension Other Pension Other Weighted-average assumptions used: Discount rates in determining expense 0.76 % 0.61 % 0.63 % 3.19 % 3.27 % 3.80 % 3.87 % 2.94 % 2.72 % Discount rates in determining benefit obligation 0.61 0.63 0.71 3.87 3.99 3.05 2.96 2.34 2.23 Rates of increase in future compensation level for determining expense 3.21 3.21 3.46 4.65 — 5.01 — 5.12 — Rates of increase in future compensation level for determining benefit obligation 3.21 3.46 3.46 5.01 — 5.12 — 5.09 — Expected rates of return on plan assets 2.83 2.89 2.93 6.70 7.50 6.25 7.00 6.19 7.00 Cash balance crediting rate for determining expense 2.46 2.46 2.46 2.74 — 3.03 — 2.39 — Cash balance crediting rate for determining benefit obligation 2.46 2.46 2.46 3.03 — 2.39 — 1.62 — The following tables present the assumed health care cost trend rates for foreign offices and subsidiaries, which are used to measure the expected cost of benefits for the next year: MUAH Other than MUAH 2020 (1) 2021 (1) 2020 (1) 2021 (1) Initial trend rate 4.14 % 4.17 % 6.50 % 6.50 % Ultimate trend rate 3.77 % 3.78 % 4.50 % 4.50 % Year the rate reaches the ultimate trend rate 2027 2028 2027 2028 Note: (1) Fiscal years of MUFG Americas Holdings and foreign subsidiaries end on December 31. Therefore, the above tables present the rates and amounts at December 31, 2019 and 2020, respectively. The following table sets forth the combined funded status and amounts recognized in the accompanying consolidated balance sheets at March 31, 2020 and 2021: Domestic subsidiaries Foreign offices and subsidiaries 2020 2021 2020 2021 Non-contributory Non-contributory Pension Other Pension Other (in millions) Change in benefit obligation: Benefit obligation at beginning of fiscal year ¥ 1,841,884 ¥ 1,807,905 ¥ 469,080 ¥ 31,510 ¥ 547,013 ¥ 32,383 Service cost 49,194 46,861 14,406 366 13,947 229 Interest cost 10,969 11,091 17,370 1,159 14,295 793 Plan participants’ contributions — — 28 455 30 440 Acquisitions/ Divestitures (94 ) (2,845 ) 13,000 — (260 ) — Amendments — (22 ) 3,721 — (1,187 ) — Actuarial loss (gain) (3,053 ) (21,558 ) 58,831 (1) 1,648 51,724 (1) 1,506 Benefits paid (66,771 ) (65,730 ) (21,120 ) (2,326 ) (20,816 ) (2,488 ) Lump-sum (24,224 ) (22,219 ) (2,284 ) — (2,825 ) — Translation adjustments and other — — (6,019 ) (429 ) (20,968 ) (1,509 ) Benefit obligation at end of fiscal year 1,807,905 1,753,483 547,013 32,383 580,953 31,354 Change in plan assets: Fair value of plan assets at beginning of fiscal year 2,594,788 2,432,847 493,495 28,258 559,508 31,919 Actual return on plan assets (123,802 ) 472,185 92,087 5,695 82,615 5,165 Employer contributions 28,653 21,151 2,887 186 3,896 181 Acquisitions/ Divestitures (21 ) (2,440 ) 791 — — — Plan participants’ contributions — — 28 455 30 440 Benefits paid (66,771 ) (65,730 ) (21,120 ) (2,326 ) (20,816 ) (2,488 ) Translation adjustments and other — — (8,660 ) (349 ) (20,829 ) (1,868 ) Fair value of plan assets at end of fiscal year 2,432,847 2,858,013 559,508 31,919 604,404 33,349 Amounts recognized in the consolidated balance sheets: Prepaid benefit cost ¥ 643,520 ¥ 1,122,507 ¥ 81,301 ¥ 4,378 ¥ 94,445 ¥ 6,754 Accrued benefit cost (18,577 ) (17,977 ) (68,806 ) (4,842 ) (70,994 ) (4,759 ) Net amount recognized ¥ 624,943 ¥ 1,104,530 ¥ 12,495 ¥ (464 ) ¥ 23,451 ¥ 1,995 Note: (1) Significant gains and losses related to changes in the benefit obligation for the fiscal years ended March 31, 2020 and 2021 primarily result from changes in the discount rate. The aggregated accumulated benefit obligations of these plans at March 31, 2020 and 2021 were as follows: Domestic Foreign offices 2020 2021 2020 2021 (in millions) Aggregated accumulated benefit obligations ¥ 1,773,042 ¥ 1,719,798 ¥ 523,078 ¥ 554,375 The projected benefit obligations, accumulated benefit obligations and fair value of plan assets for the plans with accumulated benefit obligations in excess of plan assets at March 31, 2020 and 2021 were as follows: Domestic Foreign offices 2020 2021 2020 2021 (in millions) Projected benefit obligations ¥ 26,442 ¥ 24,527 ¥ 89,829 ¥ 92,527 Accumulated benefit obligations 26,442 24,527 67,609 68,720 Fair value of plan assets 7,980 6,738 21,014 21,532 MUFG Bank, Mitsubishi UFJ Trust and Banking, Mitsubishi UFJ Securities Holdings, Mitsubishi UFJ NICOS and other subsidiaries paid special lump-sum The following table presents the amounts recognized in Accumulated OCI of the MUFG Group at March 31, 2020 and 2021: Domestic subsidiaries Foreign offices and subsidiaries 2020 2021 2020 2021 Pension Pension Pension Other Pension Other (in millions) Net actuarial loss ¥ 437,254 ¥ 1,557 ¥ 114,167 ¥ 5,164 ¥ 96,807 ¥ 3,255 Prior service cost (4,255 ) (3,072 ) (7,875 ) (2,304 ) (6,167 ) (1,869 ) Gross amount recognized in Accumulated OCI 432,999 (1,515 ) 106,292 2,860 90,640 1,386 Taxes (174,915 ) (41,639 ) (27,974 ) (874 ) (23,900 ) (489 ) Net amount recognized in Accumulated OCI ¥ 258,084 ¥ (43,154 ) ¥ 78,318 ¥ 1,986 ¥ 66,740 ¥ 897 The following table presents OCI for the fiscal years ended March 31, 2020 and 2021: Domestic subsidiaries Foreign offices and subsidiaries 2020 2021 2020 2021 Pension Pension Pension Other Pension Other (in millions) Net actuarial loss (gain) arising during the year ¥ 195,492 ¥ (423,283 ) ¥ (1,732 ) ¥ (2,166 ) ¥ 319 ¥ (1,541 ) Prior service cost arising during the year — (22 ) 3,722 — (1,187 ) — Losses (gains) due to amortization: Net actuarial loss (5,641 ) (17,019 ) (8,685 ) (1,162 ) (11,560 ) (208 ) Prior service cost 1,204 1,205 2,633 1,881 2,614 448 Curtailment and settlement 2,366 4,605 (223 ) — (30 ) — Foreign currency translation adjustments — — (1,125 ) (58 ) (5,808 ) (173 ) Total changes in Accumulated OCI ¥ 193,421 ¥ (434,514 ) ¥ (5,410 ) ¥ (1,505 ) ¥ (15,652 ) ¥ (1,474 ) Investment policies MUFG’s investment policy for plan assets is based on an asset liability matching strategy which is intended to maintain adequate liquidity for benefit payments and to achieve a stable increase in the plan assets in the medium and long-term through proper risk control and return maximization. As a general rule, investment policies for plan assets are reviewed periodically for some plans and in the following situations for all plans: (1) large fluctuations in pension plan liabilities caused by modifications to pension plans, or (2) changes in the market environment. The plan assets allocation strategies are the principal determinant in achieving expected investment returns on the plan assets. Actual asset allocations may fluctuate within acceptable ranges due to market value variability. Plan assets are managed by a combination of internal and external asset management companies and are rebalanced when market fluctuations cause an asset category to fall outside of its strategic asset allocation range. Performance of each plan asset category is compared against established indices and similar plan asset groups to evaluate whether the risk associated with the portfolio is appropriate for the level of return. The weighted-average target asset allocation of plan assets for the pension benefits and other benefits at March 31, 2021 was as follows: Domestic Foreign offices Asset category Pension Pension Other Japanese equity securities 36.3 % 0.3 % — % Japanese debt securities 28.6 — — Non-Japanese 15.7 44.9 63.0 Non-Japanese 13.9 43.0 27.0 Real estate 1.4 10.0 10.0 Short-term assets 4.1 1.8 — Total 100.0 % 100.0 % 100.0 % Basis and procedure for estimating long-term return of each asset category MUFG’s expected long-term rate of return on plan assets for domestic defined benefit pension plans and SIPs is based on a building-block methodology, which calculates the total long-term rate of return of the plan assets by aggregating the weighted rate of return derived from both long-term historical performance and forward-looking return expectations from each asset category. MUFG has determined the expected long-term rate of return for each asset category as follows: • Japanese equity securities: the rate for Japanese debt securities plus a premium for the risk associated with Japanese equity securities • Japanese debt securities: economic growth rate of Japan • Non-Japanese non-Japanese non-Japanese • Non-Japanese Foreign offices and subsidiaries periodically reconsider the expected long-term rate of return for their plan assets. They evaluate the investment return volatility of different asset categories and compare the liability structure of their pension and other benefits to those of other companies, while considering their funding policy to maintain a funded status sufficient to meet participants’ benefit obligations, and reduce long-term funding requirements and pension costs. Based on this information, foreign offices and subsidiaries update the expected long-term rate of return. Estimated future benefit payments The following table presents benefit payments expected to be paid, which include the effect of expected future service for the fiscal years indicated: Domestic Foreign offices Pension Pension Other (in millions) Fiscal year ending March 31: 2022 ¥ 82,295 ¥ 23,248 ¥ 1,976 2023 80,857 24,078 2,012 2024 81,015 25,322 2,032 2025 80,709 26,245 2,004 2026 79,277 28,020 1,950 Thereafter (2027-2031) 387,189 173,667 8,272 Fair value measurement of the plan assets The following is a description of the valuation methodologies used for plan assets measured at fair value as well as the classification of the plan assets pursuant to the fair value hierarchy described in Note 31. Government bonds and other debt securities When quoted prices are available in an active market, the MUFG Group adopts the quoted prices to measure the fair value of securities and such securities are classified in Level 1 of the fair value hierarchy. Level 1 securities include Japanese government bonds, most non-Japanese non-binding non-Japanese non-Japanese Marketable equity securities When quoted prices are available in an active market, the MUFG Group adopts the quoted prices to measure the fair value of marketable equity securities and such securities are classified in Level 1 of the fair value hierarchy. When quoted prices are available but not traded actively, such securities are classified in Level 2 of the fair value hierarchy. Japanese pooled funds Japanese pooled funds are investment fund vehicles designed for Japanese pension plan investments under Japanese pension trust fund regulations. Based upon the nature of the funds’ investments, Japanese pooled funds are categorized into four major fund types: Japanese marketable equity securities type, Japanese debt securities type, Non-Japanese Non-Japanese Other investment funds Other investment funds include mutual funds, private investments funds, common collective funds, private equity funds and real estate funds. The listed investment funds or mutual funds are valued at quoted prices and classified in Level 1 or Level 2 of the fair value hierarchy. When there is no available market quotation, the fair values are generally determined at net asset values per share (or its equivalent) as a practical expedient. Other investment funds classified in Level 3 of the fair value hierarchy consist of certain real estate funds whose fair values are not measured at their net asset values but by using significant unobservable inputs and there is inherent lack of the funds’ liquidity. Japanese general accounts of life insurance companies These instruments are contracts with life insurance companies that guarantee return of a certain level of fixed income, which are mainly invested in assets with low market risk such as Japanese debt securities. They are measured at conversion value and classified in Level 2 of the fair value hierarchy. Other investments Other investments mainly consist of call loans and the rest consist of miscellaneous accounts such as deposits with banks and short-term investments. These instruments are generally classified in Level 1 or Level 2 of the fair value hierarchy depending on observability of the inputs to measure their fair values. The following table presents the fair value of each major category of plan assets as of March 31, 2020 and 2021: Pension benefits and SIP Investments: At March 31, 2020 Domestic subsidiaries Foreign offices and subsidiaries Assets category Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Japanese government bonds ¥ 147,926 ¥ — ¥ — ¥ 147,926 ¥ — ¥ — ¥ — ¥ — Non-Japanese — — — — 42,135 5,185 — 47,320 Other debt securities 7,014 12,113 325 19,452 — 105,096 — 105,096 Japanese marketable equity securities 690,741 — — 690,741 — — — — Non-Japanese 47,655 235 — 47,890 26,981 616 — 27,597 Other investment funds — — — — 81,803 150,121 — 231,924 (2) Japanese general account of life insurance companies (1) — 217,898 — 217,898 — — — — Other investments 6,547 32,150 — 38,697 480 1,937 250 2,667 Total ¥ 899,883 ¥ 262,396 ¥ 325 ¥ 1,162,604 ¥ 151,399 ¥ 262,955 ¥ 250 ¥ 414,604 At March 31, 2021 Domestic subsidiaries Foreign offices and subsidiaries Assets category Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Japanese government bonds ¥ 145,236 ¥ — ¥ — ¥ 145,236 ¥ — ¥ — ¥ — ¥ — Non-Japanese — — — — 44,105 4,645 — 48,750 Other debt securities 10,136 14,065 230 24,431 — 117,696 — 117,696 Japanese marketable equity securities 862,096 — — 862,096 — — — — Non-Japanese 81,525 588 — 82,113 34,584 671 — 35,255 Other investment funds — — — — 76,520 164,810 — 241,330 (2) Japanese general account of life insurance companies (1) — 217,827 — 217,827 — — — — Other investments 8,390 5,092 — 13,482 812 13,502 333 14,647 Total ¥ 1,107,383 ¥ 237,572 ¥ 230 ¥ 1,345,185 ¥ 156,021 ¥ 301,324 ¥ 333 ¥ 457,678 Notes: (1) “Japanese general accounts of life insurance companies” is a contract with life insurance companies that guarantees a return of approximately 1.24% from April 1, 2019 to March 31, 2020 and 1.25% from April 1, 2020 to March 31, 2021. (2) Other investment funds of the foreign offices and subsidiaries include mutual funds and common collective funds of ¥81,768 million and ¥119,307 million, respectively, which were held by MUFG Americas Holdings at December 31, 2019 and ¥80,717 million and ¥128,005 million, respectively, at December 31, 2020. The following table presents fair values of certain investments valued at net asset value per share (or its equivalent) as a practical expedient that were excluded from the above table as of March 31, 2020 and 2021: Domestic Foreign offices and Assets category 2020 2021 2020 2021 (in millions) Japanese pooled funds: Japanese marketable equity securities ¥ 125,218 ¥ 118,509 ¥ — ¥ — Japanese debt securities 212,727 324,700 — — Non-Japanese 146,796 90,598 — — Non-Japanese 169,978 215,015 — — Other 100,798 153,483 — — Total pooled funds 755,517 902,305 — — Other investment funds 514,726 (1) 610,523 (1) 144,904 (2) 146,726 (2) Total ¥ 1,270,243 ¥ 1,512,828 ¥ 144,904 ¥ 146,726 Notes: (1) Other investment funds of the domestic subsidiaries include mutual funds and real estate funds of ¥486,496 million and ¥13,891 million, respectively, at March 31, 2020 and ¥580,617 million and ¥14,763 million, respectively, at March 31, 2021. (2) Other investment funds of the foreign offices and subsidiaries include mutual funds, real estate funds and common collective funds of ¥56,125 million, ¥54,474 million and ¥34,098 million, respectively, at March 31, 2020 and ¥58,086 million, ¥51,318 million and ¥37,161 million, respectively, at March 31, 2021. Other debt securities and Japanese debt securities in the above Pension benefits and SIP tables include ¥942 million ( ( ( (

Other Assets and Liabilities _T

Other Assets and Liabilities [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Other Assets and Liabilities [Text Block]	14. OTHER ASSETS AND LIABILITIES Major components of other assets and liabilities at March 31, 2020 and 2021 were as follows: 2020 2021 (in millions) Other assets: Accounts receivable: Receivables from brokers, dealers and customers for securities transactions ¥ 1,191,690 ¥ 400,776 Other (1) 1,212,511 1,162,424 Investments in equity method investees 2,421,154 2,560,339 Prepaid benefit cost (Note 13) 729,199 1,223,706 Cash collateral pledged for derivative transactions (Note 9) 1,696,108 2,005,136 Cash collateral for the use of Bank of Japan’s settlement infrastructure 965,546 998,838 Accrued interest 308,448 259,336 Deferred tax assets (Note 8) 113,031 122,031 Right-of-use 393,435 338,547 Other 4,077,577 4,250,171 Total ¥ 13,108,699 ¥ 13,321,304 Other liabilities: Accounts payable: Payables to brokers, dealers and customers for securities transactions ¥ 1,078,653 ¥ 1,202,371 Other 1,251,260 1,281,436 Obligations to return securities received as collateral (Notes 15, 16 and 31) 4,806,171 6,581,759 Accrued interest 187,096 110,856 Deferred tax liabilities (Note 8) 541,368 827,571 Allowance for off-balance 56,995 83,615 Accrued benefit cost (Note 13) 92,225 93,730 Guarantees and indemnifications 39,601 38,123 Cash collateral received for derivative transactions (Note 9) 1,125,305 909,641 Obligations under operating leases (Note 7) 482,813 476,104 Accrued and other liabilities 3,562,359 3,465,614 Total ¥ 13,223,846 ¥ 15,070,820 Note: (1) Accounts receivable—Other is primarily comprised of receivables relating to the card business. The provision or reversal of the allowance for credit losses relating to the receivables is included in Non-interest expense on the condensed consolidated statements of income. The receivables relating to the card business include (1-3 million) as of March 31, 2021, and the credit quality for these receivables is primarily evaluated based on the extent of past due. The outstanding balance of the accounts receivable is presented on a net basis after allowance for credit losses. Upon adoption of the new guidance on measurement of credit losses on financial instruments as of April 1, 2020, the amount of the allowance for credit losses increased by on these receivables Investments in equity method investees include marketable equity securities carried at ¥1,809,161 million and ¥1,964,118 million at March 31, 2020 and 2021, respectively. Corresponding aggregated market values were ¥1,987,008 million and ¥3,943,990 million, respectively. Marketable equity securities include Morgan Stanley’s common stock carried at ¥1,411,131 million and ¥1,618,579 million at March 31, 2020 and 2021, respectively. As of March 31, 2021, the MUFG Group held approximately 20.18% of its common stock. Investments in equity method investees also include investments in Morgan Stanley MUFG Securities, Co., Ltd. at ¥185,255 million and ¥174,190 million at March 31, 2020 and 2021, respectively. The MUFG Group periodically evaluates whether a loss in value of investments in equity method investees is other-than-temporary. As a result of evaluations, the MUFG Group recognized other-than-temporary declines in the value of an investment and recorded impairment losses related to certain affiliated companies of ¥51,645 million, ¥21,672 million and ¥53,758 million for the fiscal years ended March 31, 2019, 2020 and 2021 respectively. The impairment losses are included in Equity in earnings of equity method investees—net in the accompanying consolidated statements of income . Summarized Financial Information of the MUFG Group’s Equity Method Investees Summarized financial information of Morgan Stanley, the largest portion of the MUFG Group’s equity method investees, as of March 31, 2020 and 2021, and for each of the three years ended March 31, 2021 is as follows: 2020 2021 (in billions) Trading assets ¥ 29,484 ¥ 34,670 Securities purchased under agreements to resell 11,405 12,701 Securities borrowed 7,868 11,309 Total assets 103,149 128,288 Deposits 25,601 35,775 Customer and other payables 21,556 25,477 Borrowings 21,206 23,894 Total liabilities 93,656 116,377 Noncontrolling interests 149 147 2019 2020 2021 (in billions) Net revenues ¥ 4,363 ¥ 4,457 ¥ 5,841 Total non-interest expenses 3,168 3,259 3,932 Income from continuing operations before income taxes 1,195 1,140 1,881 Net income applicable to Morgan Stanley 944 903 1,433 Summarized financial information of the MUFG Group’s equity method investees, other than Morgan Stanley as of March 31, 2020 and 2021, and for each of the three years ended March 31, 2021 is as follows: 2020 2021 (in billions) Net loans ¥ 15,190 ¥ 15,417 Total assets 29,255 28,459 Deposits 8,898 9,651 Total liabilities 24,025 24,176 Noncontrolling interests 1,005 85 2019 2020 2021 (in billions) Total interest income ¥ 1,036 ¥ 1,093 ¥ 1,058 Total interest expense 430 419 375 Net interest income 606 674 683 Provision for credit losses 157 171 215 Income before income tax expense 205 366 476 Net income 135 285 400

Offsetting of Derivatives, Repu

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block]	15. OFFSETTING OF DERIVATIVES, REPURCHASE AGREEMENTS, AND SECURITIES LENDING TRANSACTIONS The following tables present, as of March 31, 2020 and 2021, the gross and net amounts of the 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 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 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 consolidated balance sheet” column in the tabular disclosure below. At March 31, 2020 Gross amounts of Gross amounts Net amounts Gross amounts not offset in Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 14,958 ¥ — ¥ 14,958 ¥ (11,282 ) ¥ (874 ) ¥ 2,802 Receivables under resale agreements 25,884 (1,888 ) 23,996 (23,195 ) (21 ) 780 Receivables under securities borrowing transactions 3,444 — 3,444 (3,336 ) — 108 Total ¥ 44,286 ¥ (1,888 ) ¥ 42,398 ¥ (37,813 ) ¥ (895 ) ¥ 3,690 Financial liabilities: Derivative liabilities ¥ 14,034 ¥ — ¥ 14,034 ¥ (11,296 ) ¥ (1,140 ) ¥ 1,598 Payables under repurchase agreements 33,733 (1,883 ) 31,850 (31,569 ) (34 ) 247 Payables under securities lending transactions 1,017 — 1,017 (986 ) — 31 Obligations to return securities received as collateral 4,806 — 4,806 (1,966 ) — 2,840 Total ¥ 53,590 ¥ (1,883 ) ¥ 51,707 ¥ (45,817 ) ¥ (1,174 ) ¥ 4,716 At March 31, 2021 Gross amounts of Gross amounts Net amounts Gross amounts not offset in Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 11,997 ¥ — ¥ 11,997 ¥ (8,628 ) ¥ (605 ) ¥ 2,764 Receivables under resale agreements 16,053 (2,273 ) 13,780 (12,687 ) (37 ) 1,056 Receivables under securities borrowing transactions 3,370 — 3,370 (3,289 ) — 81 Total ¥ 31,420 ¥ (2,273 ) ¥ 29,147 ¥ (24,604 ) ¥ (642 ) ¥ 3,901 Financial liabilities: Derivative liabilities ¥ 11,714 ¥ — ¥ 11,714 ¥ (8,545 ) ¥ (1,624 ) ¥ 1,545 Payables under repurchase agreements 26,800 (2,232 ) 24,568 (23,835 ) (60 ) 673 Payables under securities lending transactions 843 — 843 (814 ) (2 ) 27 Obligations to return securities received as collateral 6,582 — 6,582 (1,931 ) — 4,651 Total ¥ 45,939 ¥ (2,232 ) ¥ 43,707 ¥ (35,125 ) ¥ (1,686 ) ¥ 6,896

Repurchase Agreements, and Secu

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block]	16. 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, 2020 and 2021. 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 government and official institution 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, 2020 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 9,685 ¥ 16,608 ¥ 4,496 ¥ 2,944 ¥ 33,733 Payables under securities lending transactions 934 64 19 — 1,017 Obligations to return securities received as collateral 3,856 599 276 75 4,806 Total ¥ 14,475 ¥ 17,271 ¥ 4,791 ¥ 3,019 ¥ 39,556 March 31, 2021 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 6,006 ¥ 16,888 ¥ 1,973 ¥ 1,933 ¥ 26,800 Payables under securities lending transactions 789 26 28 — 843 Obligations to return securities received as collateral 5,607 278 528 169 6,582 Total ¥ 12,402 ¥ 17,192 ¥ 2,529 ¥ 2,102 ¥ 34,225 Secured borrowing by the class of collateral pledged at March 31, 2020 and 2021 was as follows: March 31, 2020 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 10,687 ¥ 38 ¥ 2,241 ¥ 12,966 Foreign government and official institution bonds 17,326 57 873 18,256 Corporate bonds 784 — 183 967 Residential mortgage-backed securities 4,248 — 10 4,258 Other debt securities 157 — 2 159 Marketable equity securities 506 914 1,497 2,917 Other 25 8 — 33 Total ¥ 33,733 ¥ 1,017 ¥ 4,806 ¥ 39,556 March 31, 2021 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 7,754 ¥ 104 ¥ 4,022 ¥ 11,880 Foreign government and official institution bonds 13,914 17 738 14,669 Corporate bonds 702 1 214 917 Residential mortgage-backed securities 3,729 — — 3,729 Other debt securities 218 — 5 223 Marketable equity securities 462 721 1,603 2,786 Other 21 — — 21 Total ¥ 26,800 ¥ 843 ¥ 6,582 ¥ 34,225

Preferred Stock _Text Block_

Preferred Stock [Text Block]	12 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Preferred Stock [Text Block]	17. PREFERRED STOCK Pursuant to the Articles of Incorporation, MUFG had been authorized to issue 400,000,000 shares of Class 5 Preferred Stock, 200,000,000 shares of Class 6 Preferred Stock, and 200,000,000 shares of Class 7 Preferred Stock without par value as of March 31, 2021. All classes of preferred stock are non-voting non-cumulative non-participating As of March 31, 2019, 2020 and 2021, there was no preferred stock outstanding and the entire amount of Capital stock on the consolidated balance sheets consisted of only common stock.

Common Stock and Capital Surplu

Common Stock and Capital Surplus [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Common Stock and Capital Surplus [Text Block]	18. COMMON STOCK AND CAPITAL SURPLUS The changes in the number of issued shares of common stock during the fiscal years ended March 31, 2019, 2020 and 2021 were as follows: 2019 2020 2021 (shares) Balance at beginning of fiscal year 13,900,028,020 13,667,770,520 13,581,995,120 Retirement of shares of common stock (232,257,500 ) (85,775,400 ) — Balance at end of fiscal year 13,667,770,520 13,581,995,120 13,581,995,120 Under the Companies Act, issuances of common stock, including conversions of bonds and notes, are required to be credited to the common stock account for at least 50% of the proceeds and to the legal capital surplus account (“legal capital surplus”) for the remaining amounts. The Companies Act permits Japanese companies, upon approval by the Board of Directors, to issue shares in the form of a “stock split,” as defined in the Companies Act. Also, prior to April 1, 1991, Japanese companies were permitted to issue free share distributions. MUFG Bank and Mitsubishi UFJ Trust and Banking from time to time made free share distributions. These free distributions usually ranged from 5% to 10% of outstanding common stock and publicly-owned corporations in the United States issuing shares in similar transactions would be required to account for them as stock dividends as of the shareholders’ record date by reducing retained earnings and increasing the appropriate capital accounts by an amount equal to the fair value of the shares issued. The application of such U.S. accounting practices to the cumulative free distributions made by MUFG Bank and Mitsubishi UFJ Trust and Banking at March 31, 2021, would have increased capital accounts by ¥1,910,106 million with a corresponding decrease in unappropriated retained earnings. The Companies Act permits that common stock, legal reserve, additional paid-in paid-in As for Capital surplus, the fee retained by MUFG’s subsidiary as underwriting compensation, net of stock issuance expense, was included in the total Capital surplus balance. Treasury Stock The Companies Act permits Japanese companies to effect purchases of their own shares pursuant to a resolution by the shareholders at an annual general meeting until the conclusion of the following ordinary general meeting of shareholders, and to hold such shares as their treasury stock indefinitely regardless of purpose. However, the Companies Act requires the amount of treasury stock purchased should be within the amount of retained earnings available for dividends. Disposition of treasury stock is subject to the approval of the Board of Directors and is to follow the procedures similar to a public offering of shares for subscription. From May 16, 2018 to June 4, 2018, MUFG repurchased 72,420,700 shares of MUFG’s common stock by market purchases based on the discretionary dealing contract regarding repurchase of own shares for approximately ¥50 billion, in aggregate, in satisfaction of the resolution adopted at the meeting of the Board of Directors of MUFG held on May 15, 2018. The repurchase plan as authorized by the Board of Directors of MUFG allowed for the repurchase of an aggregate amount of up to 100,000,000 shares, which represents the equivalent of 0.76% of the total number of common shares outstanding, or of an aggregate repurchase amount of up to ¥50 billion. On July 20, 2018, MUFG cancelled all of the acquired shares in satisfaction of the resolution adopted at the meeting of the Board of Directors of MUFG held on May 15, 2018. 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. On January 22, 2019, MUFG cancelled 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. From November 14, 2019 to December 23, 2019, MUFG repurchased 85,775,400 shares of MUFG’s common stock by market purchases based on the discretionary dealing contract regarding repurchase of own shares for approximately ¥50 billion, in aggregate, in satisfaction of the resolution adopted at the meeting of the Board of Directors of MUFG held on November 13, 2019. The repurchase plan as authorized by the Board of Directors of MUFG allowed for the repurchase of an aggregate amount of up to 100,000,000 shares, which represents the equivalent of 0.77% of the total number of common shares outstanding, or of an aggregate repurchase amount of up to ¥50 billion. On January 20, 2020, MUFG cancelled 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, 2019. The purpose of the repurchase is to enhance the return of earnings to shareholders, to improve capital efficiency, and to implement flexible capital policies.

Retained Earnings, Legal Reserv

Retained Earnings, Legal Reserve and Dividends [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Retained Earnings, Legal Reserve and Dividends [Text Block]	19. RETAINED EARNINGS, LEGAL RESERVE AND DIVIDENDS In addition to the Companies Act, Japanese banks, including MUFG Bank and Mitsubishi UFJ Trust and Banking, are required to comply with the Banking Law of Japan (the “Banking Law”). Legal Reserve Set Aside as Appropriation of Retained Earnings and Legal Capital Surplus Under the Companies Act The Companies Act provides that an amount at least equal to 10% of the aggregate amount of cash dividends and certain appropriations of retained earnings associated with cash outlays applicable to each period shall be appropriated and set aside as a legal reserve until the aggregate amount of legal reserve set aside as an appropriation of retained earnings and the legal capital surplus equals 25% of stated capital as defined in the Companies Act. Under the Banking Law The Banking Law provides that an amount at least equal to 20% of the aggregate amount of cash dividends and certain appropriations of retained earnings associated with cash outlays applicable to each fiscal year shall be appropriated and set aside as a legal reserve until the aggregate amount of legal reserve set aside as appropriation of retained earnings and the legal capital surplus equals 100% of stated capital as defined in the Companies Act. Transfer of Legal Reserve Under the Companies Act Under the Companies Act, Japanese companies, including MUFG, were permitted, pursuant to a resolution by the shareholders at a general meeting, to make legal reserve set aside as appropriation of retained earnings and legal capital surplus available for dividends until the aggregate amount of the legal reserve and legal capital surplus equals 25% of stated capital as defined in the Companies Act. Under the Companies Act, Japanese companies, including MUFG, MUFG Bank and Mitsubishi UFJ Trust and Banking, are permitted, primarily pursuant to a resolution by the shareholders at a general meeting, to transfer legal capital surplus and legal reserve to stated capital and/or retained earnings without limitations of thresholds, thereby effectively removing the thresholds provided for in the Companies Act and Banking Law at the company’s discretion. Under the Banking Law Under the Banking Law, Japanese banks, including MUFG Bank and Mitsubishi UFJ Trust and Banking, were permitted, pursuant to a resolution by the shareholders at a general meeting, to set aside a legal reserve as an appropriation of retained earnings and legal capital surplus available for dividends until the aggregate amount of the legal reserve and legal capital surplus equals 100% of stated capital as defined in the Companies Act. Unappropriated Retained Earnings and Dividends In addition to the provision that requires an appropriation for legal reserve as described above, the Companies Act and the Banking Law impose certain limitations on the amount available for dividends. Under the Companies Act, the amount available for dividends is based on the amount recorded in MUFG’s general books of account maintained in accordance with accounting principles generally accepted in Japan (“Japanese GAAP”). The adjustments included in the accompanying consolidated financial statements but not recorded in MUFG’s general books of account, as explained in Note 1, have no effect on the determination of retained earnings available for dividends under the Companies Act. Under the Banking Law, MUFG, MUFG Bank and Mitsubishi UFJ Trust and Banking have to meet the minimum capital adequacy requirements and distributions of retained earnings of MUFG, MUFG Bank and Mitsubishi UFJ Trust and Banking, which are otherwise distributable to shareholders, are restricted in order to maintain the minimum capital requirements. MUFG, formerly known as Mitsubishi Tokyo Financial Group, was established on April 2, 2001 with common stock of ¥924,400 million, preferred stock of ¥222,100 million, legal capital surplus of ¥2,838,693 million and no retained earnings in accordance with the Commercial Code of Japan (“the Code”), which was replaced by the Companies Act, and Japanese GAAP. On October 1, 2005, MUFG started with common stock and preferred stock of ¥1,383,052 million, a legal capital surplus of ¥3,577,570 million and retained earnings of ¥757,458 million in accordance with the Code and Japanese GAAP. MUFG’s amount available for dividends, at March 31, 2021, was ¥4,356,678 million, which is based on the amount recorded in MUFG’s general books of account under Japanese GAAP. Annual dividends, including those for preferred stock, are approved by the shareholders at an annual general meeting held subsequent to the fiscal year to which the dividends are applicable. In addition, a semi-annual interim dividend payment may be made by resolution of the Board of Directors, subject to limitations imposed by the Companies Act and the Banking Law. In the accompanying consolidated statements of equity, dividends and appropriations to legal reserve shown for each fiscal year represent dividends approved and paid during the fiscal year and the related appropriation to legal reserve.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) [Text Block]	12 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss) [Text Block]	20. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the changes in Accumulated OCI, net of tax and net of noncontrolling interests, for the fiscal years ended March 31, 2019, 2020 and 2021: 2019 2020 2021 (in millions) Accumulated other comprehensive income (loss), net of taxes: Net unrealized gains (losses) on investment securities: Balance at beginning of fiscal year ¥ 2,270,346 ¥ (369,369 ) ¥ (344,785 ) Net change during the fiscal year 60,616 24,584 (38,253 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (2,700,331 ) — — Effect of adopting new guidance on measurement of credit losses on financial instruments — — 34 Balance at end of fiscal year ¥ (369,369 ) ¥ (344,785 ) ¥ (383,004 ) Net debt valuation adjustments: Balance at beginning of fiscal year ¥ (16,488 ) ¥ (8,670 ) ¥ 45,502 Net change during the fiscal year 9,729 54,172 (83,364 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (1,911 ) — — Balance at end of fiscal year ¥ (8,670 ) ¥ 45,502 ¥ (37,862 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Balance at beginning of fiscal year ¥ (19,250 ) ¥ (24,140 ) ¥ (13,343 ) Net change during the fiscal year (4,890 ) 10,797 32,372 Balance at end of fiscal year ¥ (24,140 ) ¥ (13,343 ) ¥ 19,029 Defined benefit plans: Balance at beginning of fiscal year ¥ (119,593 ) ¥ (208,273 ) ¥ (337,918 ) Net change during the fiscal year (88,680 ) (129,645 ) 317,536 Balance at end of fiscal year ¥ (208,273 ) ¥ (337,918 ) ¥ (20,382 ) Foreign currency translation adjustments: Balance at beginning of fiscal year ¥ 362,300 ¥ 326,183 ¥ 230,127 Net change during the fiscal year (36,117 ) (96,056 ) (97,389 ) Balance at end of fiscal year ¥ 326,183 ¥ 230,127 ¥ 132,738 Balance at end of fiscal year ¥ (284,269 ) ¥ (420,417 ) ¥ (289,481 ) The following table presents the before tax and net of tax changes in each component of Accumulated OCI for the fiscal years ended March 31, 2019, 2020 and 2021: 2019 2020 2021 Before tax Tax Net of tax Before tax Tax Net of tax Before tax Tax Net of tax (in millions) Net unrealized gains (losses) on investment securities: Net unrealized gains (losses) on investment securities ¥ 132,723 ¥ (24,690 ) ¥ 108,033 ¥ 100,974 ¥ (2,260 ) ¥ 98,714 ¥ (69,247 ) ¥ (599 ) ¥ (69,846 ) Reclassification adjustment for losses (gains) (28,953 ) 9,100 (19,853 ) (107,102 ) 32,007 (75,095 ) (383 ) (547 ) (930 ) Net change 103,770 (15,590 ) 88,180 (6,128 ) 29,747 23,619 (69,630 ) (1,146 ) (70,776 ) Net unrealized gains (losses) on investment securities attributable to noncontrolling interests 27,564 (965 ) (32,523 ) Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group 60,616 24,584 (38,253 ) Net debt valuation adjustments: Net debt valuation 13,006 (3,982 ) 9,024 77,765 (23,812 ) 53,953 (126,007 ) 38,584 (87,423 ) Reclassification adjustment for losses included in net income before attribution of noncontrolling interests 1,016 (311 ) 705 315 (96 ) 219 5,851 (1,792 ) 4,059 Net change 14,022 (4,293 ) 9,729 78,080 (23,908 ) 54,172 (120,156 ) 36,792 (83,364 ) Net debt valuation adjustments attributable to noncontrolling interests — — — Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group 9,729 54,172 (83,364 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Net unrealized gains (losses) on derivatives qualifying for cash flow hedges (10,397 ) 2,825 (7,572 ) 1,375 (560 ) 815 44,255 (12,359 ) 31,896 Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests 3,662 (980 ) 2,682 13,279 (3,452 ) 9,827 164 115 279 Net change (6,735 ) 1,845 (4,890 ) 14,654 (4,012 ) 10,642 44,419 (12,244 ) 32,175 2019 2020 2021 Before tax Tax Net of tax Before tax Tax Net of tax Before tax Tax Net of tax (in millions) Net unrealized losses on derivatives qualifying for cash flow hedges attributable to noncontrolling interests — (155 ) (197 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group (4,890 ) 10,797 32,372 Defined benefit plans: Defined benefit plans (126,001 ) 37,655 (88,346 ) (195,851 ) 59,426 (136,425 ) 436,435 (133,404 ) 303,031 Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests (1,168 ) 574 (594 ) 6,643 (1,741 ) 4,902 22,504 (6,479 ) 16,025 Net change (127,169 ) 38,229 (88,940 ) (189,208 ) 57,685 (131,523 ) 458,939 (139,883 ) 319,056 Defined benefit plans attributable to noncontrolling interests (260 ) (1,878 ) 1,520 Defined benefit plans attributable to Mitsubishi UFJ Financial Group (88,680 ) (129,645 ) 317,536 Foreign currency translation adjustments: Foreign currency translation adjustments (18,062 ) (17,932 ) (35,994 ) (99,520 ) 19,588 (79,932 ) (61,085 ) (14,370 ) (75,455 ) Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests (9,002 ) 2,784 (6,218 ) (2,238 ) 1,105 (1,133 ) (57,534 ) 17,738 (39,796 ) Net change (27,064 ) (15,148 ) (42,212 ) (101,758 ) 20,693 (81,065 ) (118,619 ) 3,368 (115,251 ) Foreign currency translation adjustments attributable to noncontrolling interests (6,095 ) 14,991 (17,862 ) Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group (36,117 ) (96,056 ) (97,389 ) Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group ¥ (59,342 ) ¥ (136,148) ¥ 130,902 The following table presents the effect of the reclassification of significant items out of Accumulated OCI on the respective line items of the accompanying consolidated statements of income for the fiscal years ended March 31, 2019, 2020 and 2021: 2019 2020 2021 Details of Accumulated OCI components Amount reclassified out of Line items in the consolidated (in millions) Net unrealized losses (gains) on investment securities Net losses (gains) Available-for-sale ¥ (29,182 ) ¥ (108,193 ) ¥ 6,410 Investment securities gains Impairment losses on investment securities 596 1,590 6 Investment securities gains Other (367 ) (499 ) (6,799 ) (28,953 ) (107,102 ) (383 ) Total before tax 9,100 32,007 (547 ) Income tax expense ¥ (19,853 ) ¥ (75,095 ) ¥ (930 ) Net of tax Net debt valuation adjustments ¥ 1,016 ¥ 315 ¥ 5,851 Equity in earnings of equity 1,016 315 5,851 Total before tax (311 ) (96 ) (1,792 ) Income tax expense ¥ 705 ¥ 219 ¥ 4,059 Net of tax Net unrealized losses (gains) on derivatives qualifying for cash flow hedges Interest rate contracts ¥ 3,739 ¥ 9,878 ¥ (3,579 ) Interest income on Loans, Foreign exchange contracts — 3,399 3,743 Interest expense on Long- Other (77 ) 2 — 3,662 13,279 164 Total before tax (980 ) (3,452 ) 115 Income tax expense ¥ 2,682 ¥ 9,827 ¥ 279 Net of tax Defined benefit plans Net actuarial loss (1) ¥ 11,431 ¥ 15,488 ¥ 28,787 Other non-interest expenses Prior service cost (1) (6,269 ) (5,718 ) (4,267 ) Other non-interest Gain on settlements and curtailment, and other (1) (6,330 ) (3,127 ) (2,016 ) Other non-interest income or expenses (1,168 ) 6,643 22,504 Total before tax 574 (1,741 ) (6,479 ) Income tax expense ¥ (594 ) ¥ 4,902 ¥ 16,025 Net of tax Foreign currency translation adjustments ¥ (9,004 ) ¥ (5,003 ) ¥ (57,561 ) Other non-interest income 2 2,765 27 Other non-interest expenses (9,002 ) (2,238 ) (57,534 ) Total before tax 2,784 1,105 17,738 Income tax expense ¥ (6,218 ) ¥ (1,133 ) ¥ (39,796 ) Net of tax Total reclassifications for the period ¥ (34,445 ) ¥ (89,103 ) ¥ (29,398 ) Total before tax 11,167 27,823 9,035 Income tax expense ¥ (23,278 ) ¥ (61,280 ) ¥ (20,363 ) Net of tax Note: (1) These Accumulated OCI components are components of net periodic benefit cost. See Note 13 for more information.

Regulatory Capital Requirements

Regulatory Capital Requirements [Text Block]	12 Months Ended
	Mar. 31, 2021
Banking Regulation, Total Capital [Abstract]
Regulatory Capital Requirements [Text Block]	21. REGULATORY CAPITAL REQUIREMENTS Japan MUFG, MUFG Bank, Mitsubishi UFJ Trust and Banking and Mitsubishi UFJ Securities Holdings are subject to various regulatory capital requirements promulgated by the regulatory authorities of the countries in which they operate. Failure to meet minimum capital requirements will initiate certain mandatory actions by regulators that, if undertaken, could have a direct material effect on MUFG’s consolidated financial statements. In Japan, MUFG, MUFG Bank, and Mitsubishi UFJ Trust and Banking are subject to regulatory capital requirements promulgated by the Financial Services Agency of Japan (“FSA”) in accordance with the provisions of the Banking Law and related regulations. A banking institution is subject to the minimum capital requirements both on a consolidated basis and a stand-alone basis, and is required to maintain the minimum capital irrespective of whether it operates independently or as a subsidiary under the control of another company. When a bank holding company manages operations of its banking subsidiaries, it is required to maintain the minimum capital adequacy ratio on a consolidated basis in the same manner as its subsidiary banks. The FSA provides two sets of capital adequacy guidelines. One is a set of guidelines applicable to Japanese banks and bank holding companies with their foreign offices conducting international operations, as defined, and the other is applicable to Japanese banks and bank holding companies that are not engaged in international operations conducted by their foreign offices. The Basel Committee on Banking Supervision (“BCBS”) of the Bank for International Settlements (“BIS”) sets capital adequacy standards for all internationally active banks to ensure minimum levels of capital. The Group of Central Bank Governors and Heads of Supervision reached an agreement on the new global regulatory framework, which has been referred to as “Basel III,” in July and September 2010. In December 2010, the Basel Committee agreed on the details of the Basel III rules. Effective as of March 31, 2013, Basel III was adopted by the FSA with transitional measures for Japanese banking institutions with international operations conducted by their foreign offices. MUFG calculated capital ratios as of March 31, 2020 and 2021 in accordance with Basel III. Capital Ratios Basel III is based on “three pillars”: (1) minimum capital requirements, (2) the self-regulation of financial institutions based on supervisory review process, and (3) market discipline through the disclosure of information. As for the denominator of the capital ratio, the Basel framework provides the following risk-based approaches and a range of options for determining risk-weighted assets. “Credit Risk” The Basel framework provides options for determining the risk-weighted assets for credit risk to allow banks to select approaches that are most appropriate for their level of risk assessment. Banks choose one of three approaches: “Standardized Approach,” “Foundation Internal Ratings-Based Approach” or “Advanced Internal Ratings-Based Approach (“AIRB”).” “Market Risk” In the “Amendment to the Capital Accord to incorporate market risks” of the year 1996, a choice between two methodologies “the Standardized Measurement Method” and “Internal Models Approach” is permitted. “Combination of Internal Models Approach and the Standardized Measurement Method” is also allowed under certain conditions. This is unchanged in Basel III. “Operational Risk” Operational risk, which is defined as the risk of loss resulting from inadequate or failed internal processes, people and systems or from external events, is newly added in Basel II. The Basel framework presents three methods for calculating operational risk capital charges: (i) the Basic Indicator Approach; (ii) the Standardized Approach; or (iii) Advanced Measurement Approaches (“AMA”). Banks adopt one of the three approaches to determine the risk-weighted assets for operational risk. Banks need to obtain approval from their supervisors prior to adopting the following approaches to calculate capital requirements for each risk: • the Advanced Internal Ratings-Based Approach for credit risk • the Internal Models Approach for market risk • the Standardized Approach and AMA for operational risk With approval from the FSA, MUFG and most of its major subsidiaries adopt AIRB to calculate capital requirements for credit risk, adopt the AMA to calculate capital requirements for operational risk, as for market risk, adopt the Internal Models Approach mainly to calculate general market risk and adopt the Standardized Measurement Method to calculate specific risk. The MUFG Group’s proprietary assets do not include trust assets under management and administration in a capacity of agent or fiduciary and, accordingly trust account assets are generally not included in the capital measure. However, guarantees for trust principal are counted as off-balance Under Basel III, as adopted by the FSA, MUFG’s risk-weighted assets increased, largely reflecting the new capital charge of the credit valuation adjustment (CVA), the credit risk related to asset value correlation multiplier for large financial institutions, and the 250% risk-weighted threshold items not deducted from Common Equity Tier 1 capital, as well as the conversion of certain Basel II capital deductions to risk-weighted assets, such as securitizations. On the other hand, as for the numerator of the capital ratio, there are three primary regulatory capital ratios used to assess capital adequacy, Common Equity Tier 1, Tier 1 and Total capital ratios, which are determined by dividing applicable capital components by risk-weighted assets. Tier 1 capital consists of Common Equity Tier 1 capital and Additional Tier 1 capital. Common Equity Tier 1 capital is primarily consisting of common stock, capital surplus, retained earnings, and Accumulated OCI. Regulatory adjustments including certain intangible fixed assets, such as goodwill, and defined-benefit pension fund assets, are made to Common Equity Tier 1. Additional Tier 1 capital generally consists of Basel III compliant preferred securities, and during the transition period, other capital that meets Tier 1 requirements under Basel II standards. Tier 2 capital generally consists of Basel III compliant subordinated debts, capital that meets Tier 2 requirements under Basel II standards during the transition period, certain allowances for credit losses, and noncontrolling interests in subsidiaries’ Tier 2 instruments. Total capital is defined as the sum of Tier 1 and Tier 2 capital. Effective March 31, 2016, the FSA’s capital conservation buffer, countercyclical buffer and the Global Systematically Important Bank (“G-SIB”), G-SIB Leverage Ratios The leverage ratio is designed for monitoring and preventing the build-up off-balance G-SIB G-SIB G-SIB . The risk-adjusted capital amounts and ratios, and leverage ratios, of MUFG, MUFG Bank and Mitsubishi UFJ Trust and Banking presented in the following table are based on amounts calculated in accordance with Japanese GAAP as required by the FSA. Actual For capital Amount Ratio Amount Ratio (in millions, except percentages) Consolidated: At March 31, 2020: Total capital (to risk-weighted assets): MUFG (1) ¥ 18,279,566 15.87 % ¥ 13,827,788 12.01 % BK 14,285,601 14.43 7,917,895 8.00 TB 1,889,973 25.46 593,652 8.00 Tier 1 capital (to risk-weighted assets): MUFG (1) 15,623,321 13.56 11,525,076 10.01 BK 12,170,005 12.29 5,938,421 6.00 TB 1,625,712 21.90 445,239 6.00 Common Equity Tier 1 capital (to risk-weighted assets): MUFG (1) 13,708,333 11.90 9,798,042 8.51 BK 10,597,133 10.70 4,453,816 4.50 TB 1,444,348 19.46 333,929 4.50 Leverage ratio: MUFG 15,623,321 4.42 10,593,527 3.00 BK 12,170,005 4.21 8,656,169 3.00 TB 1,625,712 4.51 1,079,863 3.00 Actual For capital Amount Ratio Amount Ratio (in millions, except percentages) At March 31, 2021: Total capital (to risk-weighted assets): MUFG (1) ¥ 18,669,510 16.31 % ¥ 13,730,324 12.00 % BK 14,630,443 15.04 7,779,147 8.00 TB 2,099,662 22.47 747,524 8.00 Tier 1 capital (to risk-weighted assets): MUFG (1) 15,982,746 13.96 11,441,937 10.00 BK 12,411,352 12.76 5,834,360 6.00 TB 1,870,988 20.02 560,643 6.00 Common Equity Tier 1 capital (to risk-weighted assets): MUFG (1) 14,113,722 12.33 9,725,646 8.50 BK 10,865,302 11.17 4,375,770 4.50 TB 1,681,140 17.99 420,482 4.50 Leverage ratio: MUFG 15,982,746 5.45 8,781,753 3.00 BK 12,411,352 5.22 7,123,396 3.00 TB 1,870,988 7.53 744,744 3.00 Stand-alone: At March 31, 2020: Total capital (to risk-weighted assets): BK ¥ 12,092,262 14.76 % ¥ 6,550,969 8.00 % TB 2,131,514 25.42 670,714 8.00 Tier 1 capital (to risk-weighted assets): BK 10,254,608 12.52 4,913,227 6.00 TB 1,867,723 22.27 503,035 6.00 Common Equity Tier 1 capital (to risk-weighted assets): BK 8,738,975 10.67 3,684,920 4.50 TB 1,686,723 20.11 377,276 4.50 Leverage ratio: BK 10,254,608 4.02 7,644,928 3.00 TB 1,867,723 5.87 953,353 3.00 At March 31, 2021: Total capital (to risk-weighted assets): BK ¥ 12,359,493 14.60 % ¥ 6,770,631 8.00 % TB 2,294,694 21.91 837,567 8.00 Tier 1 capital (to risk-weighted assets): BK 10,512,405 12.42 5,077,974 6.00 TB 2,066,480 19.73 628,176 6.00 Common Equity Tier 1 capital (to risk-weighted assets): BK 9,025,272 10.66 3,808,480 4.50 TB 1,876,980 17.92 471,132 4.50 Leverage ratio: BK 10,512,405 5.14 6,127,521 3.00 TB 2,066,480 8.95 691,914 3.00 Note: (1) Effective March 31, 2016, the FSA’s capital conservation buffer, countercyclical buffer and G-SIB G-SIB .00 Mitsubishi UFJ Morgan Stanley Securities and other securities subsidiaries in Japan and overseas are also subject to regulatory capital requirements of the countries or jurisdictions in which they operate. In Japan, the Financial Instruments and Exchange Act and related ordinance require financial instruments firms to maintain a minimum capital ratio of 120% calculated as a percentage of capital accounts less certain fixed assets, as determined in accordance with Japanese GAAP, against amounts equivalent to market, counterparty credit and operational risks. Specific guidelines are issued as a ministerial ordinance which details the definition of essential components of the capital ratios, including capital, deductible fixed asset items and risks, and related measures. Failure to maintain a minimum capital ratio will trigger mandatory regulatory actions. A capital ratio of less than 140% will call for regulatory reporting and a capital ratio of less than 100% may lead to a suspension of all or part of the business for a period of time and cancellation of a registration. At March 31, 2020, Mitsubishi UFJ Morgan Stanley Securities’s capital accounts less certain fixed assets of ¥440,520 million on a stand-alone basis and ¥465,343 million on a consolidated basis, were 313.0% and 316.2% of the total amounts equivalent to market, counterparty credit and operational risks, respectively. At March 31, 2021, its capital accounts less certain fixed assets of ¥475,343 million on a stand-alone basis, are 275.4% of the total amounts equivalent to market, counterparty credit and operational risks. Management believes, as of March 31, 2021, that MUFG, MUFG Bank, Mitsubishi UFJ Trust and Banking, Mitsubishi UFJ Morgan Stanley Securities and other regulated securities subsidiaries met all capital adequacy requirements to which they are subject. United States of America In the United States of America, MUFG Americas Holdings and its banking subsidiary MUFG Union Bank, N.A. (“MUFG Union Bank” or “BK(US)”), MUFG Bank’s largest subsidiaries operating outside Japan, are subject to various regulatory capital requirements administered by the U. S. Federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a material effect on MUFG Americas Holdings’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, MUFG Americas Holdings and MUFG Union Bank must meet specific capital guidelines that involve quantitative measures of MUFG Americas Holdings’s and MUFG Union Bank’s assets, liabilities, and certain off-balance Quantitative measures established by regulation to help ensure capital adequacy require MUFG Americas Holdings and MUFG Union Bank to maintain minimum amounts and ratios (set forth in the tables below) of Total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and of Tier 1 capital (as defined) to quarterly average assets (as defined). In July 2013, the Board of Governors of the Federal Reserve System and the other U.S. Federal banking agencies adopted final rules making significant changes to the U.S. regulatory capital framework for U.S. banking organizations (U.S. Basel III). The final rules are intended to conform this framework to the BCBS’ current international regulatory capital accord (Basel III). These rules replace the U.S. Federal banking agencies’ general risk-based capital rules (commonly known as “Basel I”), advanced approaches rules (commonly known as “Basel II”) that are applicable to certain large banking organizations (including MUFG Union Bank), and leverage rules, and are subject to certain transition provisions. Among other requirements, the U.S. Basel III rules revise the definition of capital, increase minimum capital ratios, and introduce a minimum Common Equity Tier 1 capital ratio of 4.5% and a capital conservation buffer of 2.5% (for a total minimum Common Equity Tier 1 capital ratio of 7.0%) and a potential countercyclical buffer of up to 2.5%, which would be imposed by regulators at their discretion if it is determined that a period of excessive credit growth is contributing to an increase in financial institution systemic risk; mandate a Tier 1 leverage ratio of 4% and introduce, for large and internationally active bank holding companies, a Tier 1 Supplementary Leverage Ratio that is currently set at 3% and which incorporates off-balance phase-in As required under U.S. Basel III rules, the 2.5% capital conservation buffer is being implemented on a phased-in period that commenced on January 1, 2016. MUFG Americas Holdings and MUFG Union Bank satisfy the minimum capital requirements including the capital conservation buffer on a fully phased-in The figures on the table below are calculated according to U.S. Basel III as of December 31, 2019 and 2020. MUFG Americas Holdings’s actual capital amounts and ratios are presented as follows: Actual Minimum capital (1) Amount Ratio Amount Ratio (in millions, except percentages) MUAH: At December 31, 2019: Total capital (to risk-weighted assets) $ 15,769 14.73 % $ 11,237 10.500 % Tier 1 capital (to risk-weighted assets) 15,086 14.10 9,097 8.500 Tier 1 capital (to quarterly average assets) (2) 15,086 8.88 6,792 4.000 Common Equity Tier 1 capital (to risk-weighted assets) 15,086 14.10 7,492 7.000 At December 31, 2020: Total capital (to risk-weighted assets) $ 16,871 16.29 % $ 12,843 12.400 % Tier 1 capital (to risk-weighted assets) 15,823 15.28 10,772 10.400 Tier 1 capital (to quarterly average assets) (2) 15,823 9.56 6,623 4.000 Common Equity Tier 1 capital (to risk-weighted assets) 15,823 15.28 9,218 8.900 Notes: (1) The minimum capital requirement includes a capital conservation buffer of 2.5% at December 31, 2019 and 4.4% at December 31, 2020. (2) Excludes certain deductions. The figures on the table below are calculated according to U.S. Basel III as of December 31, 2019 and 2020. MUFG Union Bank’s actual capital amounts and ratios are presented as follows: Actual Minimum capital (1) Ratios OCC Amount Ratio Amount Ratio Amount Ratio (in millions, except percentages) BK(US): At December 31, 2019: Total capital (to risk-weighted assets) $ 14,746 15.11 % $ 10,244 10.500 % $ 9,756 10.00 % Tier 1 capital (to risk-weighted assets) 14,115 14.47 8,293 8.500 7,805 8.00 Tier 1 capital (to quarterly average assets) (2) 14,115 10.65 5,304 4.000 6,629 5.00 Common Equity Tier 1 capital (to risk-weighted assets) 14,115 14.47 6,829 7.000 6,342 6.50 At December 31, 2020: Total capital (to risk-weighted assets) $ 15,629 16.68 % $ 9,836 10.500 % $ 9,368 10.00 % Tier 1 capital (to risk-weighted assets) 14,634 15.62 7,963 8.500 7,494 8.00 Tier 1 capital (to quarterly average assets) (2) 14,634 11.12 5,262 4.000 6,577 5.00 Common Equity Tier 1 capital (to risk-weighted assets) 14,634 15.62 6,557 7.000 6,089 6.50 Notes: (1) Beginning January 1, 2019, the minimum capital requirement includes a capital conservation buffer of 2.5%. (2) Excludes certain deductions. Management believes, as of December 31, 2020, that MUFG Americas Holdings and MUFG Union Bank met all capital adequacy requirements to which they are subject. As of December 31, 2019 and 2020, the notification from the OCC categorized MUFG Union Bank as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized,” MUFG Union Bank must maintain a minimum total risk-based capital ratio of 10% as of December 31, 2019 and 2020, a Tier 1 risk-based capital ratio of 8% as of December 31, 2019 and 2020, a Tier 1 capital to quarterly average assets of 5% as of December 31, 2019 and 2020, and Common Equity Tier 1 risk-based capital ratio of 6.5% as of December 31, 2019 and 2020, as set forth in the table. There are no

Earnings Per Common Share Appli

Earnings Per Common Share Applicable to Common Shareholders of MUFG [Text Block]	12 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share Applicable to Common Shareholders of MUFG [Text Block]	22. EARNINGS PER COMMON SHARE APPLICABLE TO COMMON SHAREHOLDERS OF MUFG Reconciliations of net income and weighted average number of common shares outstanding used for the computation of basic EPS to the adjusted amounts for the computation of diluted EPS for the fiscal years ended March 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 (in millions) Income (Numerator): Net income attributable to Mitsubishi UFJ Financial Group ¥ 718,645 ¥ 305,955 ¥ 1,117,298 Effect of dilutive instruments: Stock acquisition rights and restricted stock units—Morgan Stanley (3,745 ) (2,861 ) (4,159 ) Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group and assumed conversions ¥ 714,900 ¥ 303,094 ¥ 1,113,139 2019 2020 2021 (thousands of shares) Shares (Denominator): Weighted average common shares outstanding 13,058,698 12,912,790 12,859,737 Effect of dilutive instruments: Stock acquisition rights and the common shares of MUFG under the Board Incentive Plan (1) 484 166 — Weighted average common shares for diluted computation 13,059,182 12,912,956 12,859,737 2019 2020 2021 (in yen) 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 ¥ 55.03 ¥ 23.69 ¥ 86.88 Diluted earnings per common share: Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group (1) ¥ 54.74 ¥ 23.47 ¥ 86.56 Note: (1) For the fiscal years ended March 31, 2019, 2020 and 2021, the performance-based plan under the Board Incentive Plan could potentially dilute earnings per common share but were no

Derivative Financial Instrument

Derivative Financial Instruments [Text Block]	12 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments [Text Block]	23. 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. Market risk is the possibility that future changes in market indices make the financial instruments less valuable. The MUFG Group is a party to derivative financial instruments, including swaps, forwards, options and other types of derivatives, dealing primarily with market risk associated with interest rates, foreign currencies, equity and commodity prices, and credit risk associated with counterparty’s nonperformance of transactions. Credit risk is the possibility that a loss may result from a counterparty’s failure to perform according to the terms and conditions of the contract, which may exceed the value of underlying collateral. To reduce credit risk, the MUFG Group may require collateral or guarantees based on a case-by-case Trading Activities The MUFG Group’s trading activities include dealing and customer accommodation activities. As part of its trading activities, the MUFG Group offers a variety of derivative financial instruments for managing interest rate and foreign exchange risk to its domestic and foreign corporate and financial institution customers. The MUFG Group also enters into other types of derivative transactions, including equity and credit-related contracts, for its own account . Risk Management Activities As part of the MUFG Group’s risk management activities, asset and liability management is viewed as one of the methods for the MUFG Group to manage its interest rate exposures on interest-bearing assets and liabilities. The MUFG Group uses certain derivative financial instruments in order to minimize significant unplanned fluctuations in earnings that are caused by interest rate volatility. For example, an increase or a decrease in interest income and interest expense on hedged variable rate assets and liabilities as a result of interest rate fluctuations are expected to be substantially offset by the variability in earnings by gains and losses on the derivative instruments that are linked to these hedged assets and liabilities. The MUFG Group enters into interest rate swaps and other contracts primarily to manage the interest rate risk of its loans, investment securities and deposit liabilities. Interest rate contracts, which are generally non-leveraged The MUFG Group enters into forward exchange contracts, currency swaps and other contracts in response to currency exposures resulting from on-balance Derivatives Designated as Hedges The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered mainly by MUFG Americas Holdings whose fiscal period ends on December 31. Cash Flow Hedges From time to time, MUFG Americas Holdings uses interest rate derivatives to hedge the risk of changes in cash flows attributable to changes in the designated interest rate on the London Interbank Offered Rate (“LIBOR”) indexed loans, and to a lesser extent, to hedge interest rate risk on rollover debt. MUFG Americas Holdings used interest rate derivatives with an aggregate notional amount of ¥983.3 billion at December 31, 2020 to hedge the risk of changes in cash flows attributable to changes in the designated interest rates from variable rate loans. MUFG Americas Holdings used interest rate derivatives with an aggregate notional amount of ¥0.9 billion at December 31, 2020 to hedge the risk of changes in cash flows attributable to changes in the designated interest rate on LIBOR indexed short-term borrowings. At December 31, 2020, the weighted average remaining life of the active cash flow hedges was 2.7 years. For cash flow hedges, changes in the fair value of the hedging instruments are reported as a component of OCI and reclassified into earnings in the same period or periods during which the hedged cash flows are recognized in net interest income. At December 31, 2020, MUFG Americas Holdings expects to reclassify approximately ¥11.3 billion of income from Accumulated OCI as an increase to net interest income during the twelve months ending December 31, 2021. This amount could differ from amounts actually realized due to changes in interest rates, hedge terminations and the addition of other hedges subsequent to December 31, 2020. Notional Amounts of Derivative Contracts The following table summarizes the notional amounts of derivative contracts at March 31, 2020 and 2021: Notional amounts (1) 2020 2021 (in trillions) Interest rate contracts ¥ 1,553.5 ¥ 1,308.4 Foreign exchange contracts 230.2 222.0 Equity contracts 8.1 8.0 Commodity contracts 0.1 0.1 Credit derivatives 8.7 9.8 Other 3.1 3.5 Total ¥ 1,803.7 ¥ 1,551.8 Note: (1) Includes both written and purchased positions. Impact of Derivatives on the Consolidated Balance Sheets The following table summarizes fair value information on derivative instruments that are recorded on the MUFG Group’s consolidated balance sheets at March 31, 2020 and 2021: Fair value of derivative instruments 2020 (1)(5) 2021 (1)(5) Not designated (2) Designated (3) Total (4) Not designated (2) Designated (3) Total (4) (in billions) Derivative assets: Interest rate contracts ¥ 10,847 ¥ — ¥ 10,847 ¥ 7,718 ¥ — ¥ 7,718 Foreign exchange contracts 3,734 — 3,734 3,910 — 3,910 Equity contracts 236 — 236 231 — 231 Commodity contracts 26 — 26 27 — 27 Credit derivatives 114 — 114 94 — 94 Other (6) 1 — 1 17 — 17 Total derivative assets ¥ 14,958 ¥ — ¥ 14,958 ¥ 11,997 ¥ — ¥ 11,997 Derivative liabilities: Interest rate contracts ¥ 10,205 ¥ — ¥ 10,205 ¥ 7,361 ¥ — ¥ 7,361 Foreign exchange contracts 3,604 4 3,608 4,022 5 4,027 Equity contracts 277 — 277 237 — 237 Commodity contracts 26 — 26 27 — 27 Credit derivatives 95 — 95 109 — 109 Other (6) (177 ) — (177 ) (47 ) — (47 ) Total derivative liabilities ¥ 14,030 ¥ 4 ¥ 14,034 ¥ 11,709 ¥ 5 ¥ 11,714 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 and liabilities except for (6). (3) The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by certain subsidiaries. The derivative instruments which are designated as hedging instruments are presented in Other assets or Other liabilities on the accompanying 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 31. (6) Other mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, Deposits and Long-term debt. Impact of Derivatives on the Consolidated Statements of Income The following table provides more detailed information regarding the derivative-related impact on the accompanying consolidated statements of income for the fiscal years ended March 31, 2019, 2020 and 2021: Gains and losses for trading and risk management derivatives (not designated as hedging instruments) Trading and risk management derivatives gains and losses 2019 2020 2021 Foreign Trading Total Foreign Trading Total Foreign Trading Total (in billions) Interest rate contracts ¥ — ¥ 6 ¥ 6 ¥ — ¥ (173 ) ¥ (173 ) ¥ — ¥ 70 ¥ 70 Foreign exchange contracts (347 ) — (347 ) (429 ) — (429 ) (91 ) — (91 ) Equity — 80 80 — 30 30 — (269 ) (269 ) Credit derivatives — (40 ) (40 ) — 15 15 — (53 ) (53 ) Other (1) (7 ) (70 ) (77 ) (5 ) (31 ) (36 ) 11 (178 ) (167 ) Total ¥ (354 ) ¥ (24 ) ¥ (378 ) ¥ (434 ) ¥ (159 ) ¥ (593 ) ¥ (80 ) ¥ (430 ) ¥ (510 ) Note: (1) Other mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, Deposits and Long-term debt. 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. Types of such credit derivatives primarily include single name credit default swaps, index and basket credit default swaps. The MUFG Group will have to perform under a credit derivative if a credit event as defined under the contract occurs. Such credit events include bankruptcy, dissolution or insolvency of the referenced entity, default and restructuring of the obligations of the referenced entity. The MUFG Group’s counterparties are banks, broker-dealers, insurance and other financial institutions. The contractual or notional amounts of these credit derivatives represent the maximum potential amounts of future payments without consideration of possible recoveries under recourse provisions or from collateral held or pledged. The table below summarizes certain information regarding protection sold through credit derivatives as of March 31, 2020 and 2021: Protection sold Maximum potential/Notional amount Fair value At March 31, 2020: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 303,870 ¥ 2,125,006 ¥ 494,040 ¥ 2,922,916 ¥ (63,855 ) Non-investment 93,671 279,892 49,681 423,244 3,358 Not rated 2,453 6,826 — 9,279 (18 ) Total 399,994 2,411,724 543,721 3,355,439 (60,515 ) Index and basket credit default swaps: Investment grade (2) 20,000 210,602 14,950 245,552 (1,823 ) Non-investment — 106,630 — 106,630 (1,360 ) Not rated 28,296 190,398 5,316 224,010 (5,205 ) Total 48,296 507,630 20,266 576,192 (8,388 ) Total credit default swaps sold 448,290 2,919,354 563,987 3,931,631 (68,903 ) Other credit derivatives sold: Investment grade — — — — — Total credit derivatives ¥ 448,290 ¥ 2,919,354 ¥ 563,987 ¥ 3,931,631 ¥ (68,903 ) Protection sold Maximum potential/Notional amount Fair value At March 31, 2021: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 294,312 ¥ 2,235,390 ¥ 715,896 ¥ 3,245,598 ¥ (67,707 ) Non-investment 84,780 311,702 59,145 455,627 5,284 Not rated — 1,683 — 1,683 (83 ) Total 379,092 2,548,775 775,041 3,702,908 (62,506 ) Index and basket credit default swaps: Investment grade (2) 43,000 470,063 29,133 542,196 (4,753 ) Non-investment 35,427 65,319 — 100,746 (1,165 ) Not rated 59,534 29,971 852 90,357 (919 ) Total 137,961 565,353 29,985 733,299 (6,837 ) Total credit default swaps sold 517,053 3,114,128 805,026 4,436,207 (69,343 ) Other credit derivatives sold (3) Investment grade (2) — 16,606 — 16,606 57 Total credit derivatives ¥ 517,053 ¥ 3,130,734 ¥ 805,026 ¥ 4,452,813 ¥ (69,286 ) 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 guarantees for exposures held by the counterparty under interest rate swaps and other types of derivative contracts. Single name credit default swaps Index and basket credit default swaps pro-rata 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 ¥65 billion and ¥3,544 billion, respectively, at March 31, 2020, and approximately ¥66 billion and ¥4,097 billion, respectively, at March 31, 2021. 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, 2020 and 2021 was approximately ¥0.6 trillion and ¥0.7 trillion, respectively, for which the MUFG Group has posted collateral of approximately ¥152 billion and ¥227 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 ¥58 billion and ¥80 billion, respectively, as of March 31, 2020 and ¥63 billion and ¥92 billion, respectively, as of March 31, 2021.

Obligations under Guarantees an

Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block]	24. OBLIGATIONS UNDER GUARANTEES AND OTHER OFF-BALANCE Obligations under Guarantees The MUFG Group provides customers with a variety of guarantees and similar arrangements, including standby letters of credit, financial and performance guarantees, credit protection, liquidity facilities, other off-balance . For certain types of derivatives, such as written interest rate options and written currency options, the maximum potential future payments are unlimited. Accordingly, it is impracticable to estimate the maximum potential amount of future payments. As such, the notional amounts of the related contracts, other than the maximum potential payments, are included in the table. The MUFG Group mitigates its credit risk exposure resulting from guarantees by utilizing various techniques, including collateralization in the form of cash, securities, and real estate properties based on management’s credit assessment of the guaranteed parties and the related credit profile. In order to manage the credit risk exposure, the MUFG Group also enters into sub-participation Maximum Amount by expiration period At March 31, 2020: 1 year 1-5 Over (in billions) Standby letters of credit and financial guarantees ¥ 4,098 ¥ 3,109 ¥ 763 ¥ 226 Performance guarantees 3,058 2,160 738 160 Derivative instruments (1) 58,836 36,021 14,543 8,272 Liabilities of trust accounts 13,142 6,752 451 5,939 Other 88 8 73 7 Total ¥ 79,222 ¥ 48,050 ¥ 16,568 ¥ 14,604 Maximum Amount by expiration period At March 31, 2021: 1 year 1-5 Over (in billions) Standby letters of credit and financial guarantees ¥ 4,055 ¥ 3,174 ¥ 698 ¥ 183 Performance guarantees 3,193 2,315 755 123 Derivative instruments (1) 38,499 15,534 15,104 7,861 Liabilities of trust accounts 10,656 5,667 718 4,271 Other 40 6 34 — Total ¥ 56,443 ¥ 26,696 ¥ 17,309 ¥ 12,438 Note: (1) Credit derivatives sold by the MUFG Group are excluded from this presentation. Nature of Guarantee Contracts Standby letters of credit and financial guarantees generally include an obligation of an issuer or a designated third-party to guarantee the performance of the customer to the beneficiary under the terms of contracts such as lending contracts and other similar financial transactions. The MUFG Group is required to make payments to the guaranteed parties in the event that the customers fail to fulfill the obligations under the contracts. The guarantees whose contractual maturities are over 5 years are mainly comprised of guarantees of housing loans. Performance guarantees are contracts that contingently require the MUFG Group to make payments to the guaranteed party based on another party’s failure to perform under an obligating agreement, except financial obligation. For example, performance guarantees include guarantees of completion of construction projects. 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. In order for the MUFG Group to determine if those derivative instruments meet the definition of guarantees, as prescribed in the guidance on guarantees, the MUFG Group has to track whether the counterparties are actually exposed to losses that will result from the adverse change in the underlyings. Accordingly, the MUFG Group has disclosed information on all credit default swaps and certain written options for which there is a possibility of meeting the definition of guarantees as prescribed in the guidance on guarantees, regardless of whether the counterparties have assets or liabilities related to the underlyings of the derivatives. However, credit derivatives sold by the MUFG Group at March 31, 2020 and 2021 are excluded from this presentation, as they are disclosed in Note 23. Liabilities of trust accounts represent the trustee’s potential responsibility for temporary payments to creditors of liabilities of trust accounts making use of funds of the MUFG Group, unless there are certain agreements with trust creditors that have provisions limiting the MUFG Group’s exposure as a trustee to the trust account assets. A trust may incur external liabilities to obtain certain services during the terms of the trust arrangement. While in principle, any liabilities of a trust are payable by the trust account and its beneficiaries. A trustee’s responsibility may be interpreted to encompass temporary payments for the trust account liabilities when the trust account does not maintain sufficient liquidity available for such liabilities unless the agreement with trust creditors limits the trustee’s exposure to the trust account assets. Liabilities of trust accounts principally includes obligations to return collateral under security lending transactions. The MUFG Group has experienced no significant losses on such responsibilities and its exposure to the risk associated with the temporary payments is judged to be remote because trust account liabilities are generally covered by the corresponding trust account assets. The MUFG Group continuously monitors the liabilities of trust accounts and assesses the trust account’s ability to perform its obligations to prevent any unfavorable outcomes; the MUFG Group claims its recourse for its temporary payments against the trust account assets and the beneficiaries. Carrying Amount At March 31, 2020 and 2021, the carrying amounts of the liabilities related to guarantees and similar instruments set forth above were ¥1,130,522 million and ¥857,862 million, respectively, which are included in Other liabilities and Trading account liabilities. The guarantees and similar instruments comprising the largest components of the total were options sold in the amount of ¥1,090,921 million and ¥819,739 million as of March 31, 2020 and 2021, respectively. Credit derivatives sold by the MUFG Group at March 31, 2020 and 2021 are excluded from this presentation, as they are disclosed in Note 23. In addition, Other liabilities include an allowance for off-balance 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, 2020 and 2021. 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. Amount by borrower grade At March 31, 2020: Maximum Normal Close (1) Likely to (2) Not (in billions) Standby letters of credit and financial guarantees ¥ 4,098 ¥ 3,984 ¥ 93 ¥ 17 ¥ 4 Performance guarantees 3,058 2,904 96 36 22 Total ¥ 7,156 ¥ 6,888 ¥ 189 ¥ 53 ¥ 26 Amount by borrower grade At March 31, 2021: Maximum Normal Close (1) Likely to (2) Not (in billions) Standby letters of credit and financial guarantees ¥ 4,055 ¥ 3,929 ¥ 108 ¥ 15 ¥ 3 Performance guarantees 3,193 3,092 70 3 28 Total ¥ 7,248 ¥ 7,021 ¥ 178 ¥ 18 ¥ 31 Notes: (1) Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons. (2) Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment, The guarantees the MUFG Group does not classify based upon internal credit ratings are as follows. The MUFG Group records all derivative contracts at fair value. Aggregate market risk limits have been established, and market risk measures are routinely monitored against these limits. The MUFG Group also manages its exposure to these derivative contracts through a variety of risk mitigation strategies, including, but not limited to, offsetting economic hedge positions. The MUFG Group expects the risk of loss to be remote and believes that the notional amounts of the derivative contracts generally exceed its exposure. Liabilities of trust accounts represent the trustee’s potential responsibility for temporary payments to creditors of liabilities of trust accounts using funds of the MUFG Group. The MUFG Group has experienced no significant losses on such responsibilities and its exposure to the risk associated with the temporary payments is judged to be remote because trust account liabilities are generally covered by the corresponding trust account assets. Other Off-balance In addition to obligations under guarantees and similar arrangements set forth above, the MUFG Group issues other off-balance off-balance off-balance 2020 2021 (in billions) Commitments to extend credit ¥ 76,398 ¥ 84,614 Commercial letters of credit 757 835 Commitments to make investments 247 281 Other 5 — Commitments to extend credit, which generally have fixed expiration dates or other termination clauses, are binding agreements to lend to customers. Commitments are different from guarantees in that the commitments are generally revocable or have provisions that enable the MUFG Group to avoid payments in the event of violations of any conditions of the contracts and certain deterioration of the potential borrowers’ financial condition. Commercial letters of credit, generally used for trade transactions, are typically secured by the underlying goods. The MUFG Group continually monitors the type and amount of collateral and other securities, and requires counterparties to provide additional collateral or guarantors as necessary. Commitments to make investments are legally binding contracts to make additional contributions to corporate recovery or private equity investment funds in accordance with limited partnership agreements. Some of these funds, in which the MUFG Group has significant variable interests, are described in Note 25.

Variable Interest Entities _Tex

Variable Interest Entities [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Variable Interest Entities [Text Block]	25. 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. The following tables present the assets and liabilities of consolidated VIEs recorded on the accompanying consolidated balance sheets at March 31, 2020 and 2021: Consolidated VIEs Consolidated assets At March 31, 2020: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 6,263,082 ¥ 102,781 ¥ 31,625 ¥ 12,989 ¥ 1,195,283 ¥ 4,913,939 ¥ 6,465 Investment funds 493,757 — 16,482 314,074 34,121 — 129,080 Special purpose entities created for structured financing 204,047 — 2,658 — — 119,348 82,041 Repackaged instruments 249,529 1,330 — 42,052 118,776 86,859 512 Securitization of the MUFG Group’s assets 10,956,261 — — — — 10,933,580 22,681 Trust arrangements 7,527,539 — 654 336,546 745,846 6,441,864 2,629 Other 31,295 350 2,055 — — 6,885 22,005 Total consolidated assets before elimination 25,725,510 104,461 53,474 705,661 2,094,026 22,502,475 265,413 The amounts eliminated in consolidation (6,877,849 ) (103,615 ) (23,427 ) (10,592 ) (289,567 ) (6,429,880 ) (20,768 ) Total consolidated assets ¥ 18,847,661 ¥ 846 ¥ 30,047 ¥ 695,069 ¥ 1,804,459 ¥ 16,072,595 ¥ 244,645 Consolidated liabilities Total Deposits Other short-term Long-term All other (in millions) Asset-backed conduits ¥ 6,253,318 ¥ — ¥ 4,327,685 ¥ 1,478,921 ¥ 446,712 Investment funds 15,817 — — 5,546 10,271 Special purpose entities created for structured financing 114,357 — — 112,474 1,883 Repackaged instruments 251,056 — 65,965 163,833 21,258 Securitization of the MUFG Group’s assets 10,924,830 — 16,008 10,077,839 830,983 Trust arrangements 7,522,190 6,743,261 — — 778,929 Other 27,302 — 5,989 1,321 19,992 Total consolidated liabilities before elimination 25,108,870 6,743,261 4,415,647 11,839,934 2,110,028 The amounts eliminated in consolidation (15,045,398 ) (703 ) (2,526,893 ) (11,374,581 ) (1,143,221 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,465,320 ) (6,742,558 ) (1,857,923 ) (1 ) (864,838 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 598,152 ¥ — ¥ 30,831 ¥ 465,352 ¥ 101,969 Consolidated VIEs Consolidated assets At March 31, 2021: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 5,986,887 ¥ 109,439 ¥ 40,061 ¥ 5,433 ¥ 1,015,434 ¥ 4,800,221 ¥ 16,299 Investment funds 374,324 — 15,171 240,327 41,512 — 77,314 Special purpose entities created for structured financing 175,630 — 2,058 4,645 — 113,943 54,984 Repackaged instruments 281,331 3,179 — 73,914 118,199 85,782 257 Securitization of the MUFG Group’s assets 10,358,628 — 996 — — 10,339,273 18,359 Trust arrangements 9,029,390 — — 623,466 1,071,708 7,334,215 1 Other 43,320 323 3,826 17,108 — 4,660 17,403 Total consolidated assets before elimination 26,249,510 112,941 62,112 964,893 2,246,853 22,678,094 184,617 The amounts eliminated in consolidation (8,121,094 ) (110,243 ) (31,690 ) (5,892 ) (519,561 ) (7,430,166 ) (23,542 ) Total consolidated assets ¥ 18,128,416 ¥ 2,698 ¥ 30,422 ¥ 959,001 ¥ 1,727,292 ¥ 15,247,928 ¥ 161,075 Consolidated liabilities Total Deposits Other short-term Long-term All other (in millions) Asset-backed conduits ¥ 5,989,188 ¥ — ¥ 4,058,248 ¥ 1,461,043 ¥ 469,897 Investment funds 15,039 — — 5,831 9,208 Special purpose entities created for structured financing 97,226 — — 84,973 12,253 Repackaged instruments 284,795 — 21,343 195,987 67,465 Securitization of the MUFG Group’s assets 10,367,099 — 31,000 9,839,204 496,895 Trust arrangements 9,029,272 7,826,959 — — 1,202,313 Other 39,141 — 3,433 18,315 17,393 Total consolidated liabilities before elimination 25,821,760 7,826,959 4,114,024 11,605,353 2,275,424 The amounts eliminated in consolidation (14,679,458 ) — (2,422,978 ) (11,144,547 ) (1,111,933 ) The amount of liabilities with recourse to the general credit of the MUFG Group (10,547,483 ) (7,826,959 ) (1,657,447 ) (3,043 ) (1,060,034 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 594,819 ¥ — ¥ 33,599 ¥ 457,763 ¥ 103,457 In general, the creditors or beneficial interest holders of consolidated VIEs have recourse not only to the assets of those VIEs of which they are creditors or beneficial interest holders, but also to other assets of the MUFG Group, since the MUFG Group is also contractually required to provide credit enhancement or program-wide liquidity to these VIEs. The following tables present the total assets of non-consolidated non-consolidated non-consolidated Non-consolidated VIEs On-balance On-balance sheet At March 31, 2020: Total assets Maximum Total Trading Investment Loans All Total All other (in millions) Asset-backed conduits ¥ 27,700,099 ¥ 5,836,895 ¥ 4,797,551 ¥ 190 ¥ 1,737,979 ¥ 3,059,382 ¥ — ¥ — ¥ — Investment funds 55,644,434 1,918,403 1,712,037 437,858 525,022 724,253 24,904 356,679 356,679 Special purpose entities created for structured financing 37,026,192 3,601,834 2,764,156 392,588 35,774 2,317,128 18,666 6,058 6,058 Repackaged instruments 8,215,327 3,030,263 2,931,617 394,478 2,123,058 361,184 52,897 — — Other 54,962,702 2,940,349 2,314,142 191,646 — 1,995,985 126,511 41,693 41,693 Total ¥ 183,548,754 ¥ 17,327,744 ¥ 14,519,503 ¥ 1,416,760 ¥ 4,421,833 ¥ 8,457,932 ¥ 222,978 ¥ 404,430 ¥ 404,430 Non-consolidated VIEs On-balance On-balance sheet At March 31, 2021: Total assets Maximum Total Trading Investment Loans All Total All other (in millions) Asset-backed conduits ¥ 25,491,847 ¥ 5,606,965 ¥ 4,211,342 ¥ 277 ¥ 1,598,992 ¥ 2,612,073 ¥ — ¥ — ¥ — Investment funds 102,840,486 2,646,071 2,288,210 538,190 501,434 1,213,179 35,407 114,911 114,911 Special purpose entities created for structured financing 38,771,947 4,409,839 3,254,145 476,784 25,234 2,745,441 6,686 10,447 10,447 Repackaged instruments 8,604,182 3,088,564 3,008,695 611,245 2,142,482 204,332 50,636 29,478 29,478 Other 65,455,861 3,039,135 2,176,775 198,144 — 1,915,912 62,719 24,732 24,732 Total ¥ 241,164,323 ¥ 18,790,574 ¥ 14,939,167 ¥ 1,824,640 ¥ 4,268,142 ¥ 8,690,937 ¥ 155,448 ¥ 179,568 ¥ 179,568 Maximum exposure to loss on each type of entity is determined based on the carrying amount of any on-balance off-balance sheet date and does not reflect the likelihood of such a loss being incurred. The difference between the amount of on-balance Asset-Backed Conduits This category primarily comprises the following: Multi-Seller Conduits (MUFG-sponsored Asset-Backed Commercial Paper (“ABCP”) Conduits and Other ABCP Conduits) The MUFG Group administers several conduits under asset-backed financing programs under which the conduits purchase financial assets, primarily trade accounts receivable, from the MUFG Group’s customers by issuing short-term financing instruments, primarily commercial paper, to third-party investors. Under the asset-backed financing programs, the MUFG Group acts as an agent for the conduits, which enter into agreements with the MUFG Group’s customers where the customers transfer financial assets to the conduits in exchange for monetary consideration. The MUFG Group also underwrites commercial paper for the conduits that is secured by the assets held by them and provides program-wide liquidity and credit enhancement facilities to the conduits. The MUFG Group receives fees related to the services it provides to the conduits and the program-wide liquidity and credit enhancement. The MUFG Group considers itself to be the primary beneficiary of the multi-seller conduits because, as an agent and sponsor, the MUFG Group has the power to direct activities of the conduits that most significantly impact the conduits’ economic performance and also has the obligation to absorb losses of the conduits that could potentially be significant to the conduits through the program-wide liquidity and credit enhancement. Consequently, the MUFG Group consolidates the conduits. In addition to the entities described above, the MUFG Group participates as a provider of financing to several conduits that are administered by third parties. Most of these conduits are established under a multi-seller asset-backed financing program and the MUFG Group provides financing along with other financial institutions. With respect to these conduits, the MUFG Group is not considered as the primary beneficiary because the MUFG Group’s participation in the conduits is only to provide financing along with other third-party financial institutions and it does not have the power to direct the activities of the conduits. Consequently, the MUFG Group does not consolidate the conduits. Asset-Backed Conduits (MUFG-sponsored Asset-Backed Loan (“ABL”) Programs and Other Programs) The MUFG Group administers several conduits under asset-backed financing programs where the MUFG Group provides financing to fund the conduits’ purchases of financial assets, comprising primarily trade accounts receivable, from its customers. The MUFG Group acts as an agent and sponsor for the conduits, which enter into agreements with the MUFG Group’s customers where the customers transfer assets to the conduits in exchange for monetary consideration. In most cases, the MUFG Group is the sole provider of financing that is secured by the assets held by the conduits. The MUFG Group considers itself to be the primary beneficiary of the conduits because, as an agent and sponsor for the conduits, the MUFG Group has the power to direct activities of the conduits, such as selection of the assets to be purchased and condition for purchases, and debt collection from the original obligors, that most significantly impact the conduits’ economic performance, and also has the obligation to absorb losses of the conduits that could potentially be significant to the conduits through financing it provides. Consequently, the MUFG Group consolidates the conduits. In addition, the MUFG Group is involved with entities, which take in most cases the form of a trust, where originators of financial assets, which primarily comprise lease receivables, entrust the assets with trust banks and receive beneficial certificates of trusts in exchange. The originators then transfer the beneficiary certificates to the MUFG Group in exchange for cash. The originators of the financial assets entrusted continue to be involved in the assets as servicers. Because the originators are deemed to have the power to direct activities of the entities that most significantly impact the entities’ economic performance through their role as a servicer, the MUFG Group is not considered as the primary beneficiary of these entities. Consequently, the MUFG Group does not consolidate these entities. The MUFG Group also participates as a provider of financing to the ABL programs that are managed by third parties. The MUFG Group is not considered as the primary beneficiary of the entities used in these programs as the MUFG Group’s participation in the entities is only to provide financing along with other third parties and it does not have the power to direct the activities of the entities. Consequently, the MUFG Group does not consolidate the entities used in these programs. Investment Funds This category primarily comprises the following: Corporate Recovery Funds These entities are established by fund managers, which are unrelated to the MUFG Group, for the purpose of investing in debt or equity instruments issued by distressed companies. After investment, the fund managers work closely with the management of the entities and attempt to enhance corporate value by various means including corporate restructuring and reorganization. Their exit strategies include, among others, sales to others and initial public offerings. Typically, these entities take the form of a limited partnership which is entirely funded by general and limited partner interests. These partnerships are considered as VIEs unless the limited partners hold substantive kick-out The MUFG Group mostly serves as a limited partner in corporate recovery funds that are considered as VIEs, and does not have the power to direct the activities of these funds that most significantly impact the economic performance of these funds. Therefore, the MUFG Group does not consider itself to be the primary beneficiary of these funds and does not consolidate them. Private Equity Funds The MUFG Group is involved in venture capital funds that are established by either the MUFG Group’s entities or fund managers unrelated to the MUFG Group. These entities have specific investment objectives in connection with their acquisition of equity interests, such as providing financing and other support to start-up These entities typically take the form of a limited partnership and usually are entirely funded by general and limited partner interests. These partnerships are considered as VIEs unless the limited partners hold substantive kick-out The MUFG Group participates in these partnerships as a general partner or limited partner. The MUFG Group consolidates these funds, which are considered as VIEs, if the MUFG Group has the power to direct the activities of these funds that most significantly impact the economic performance of these funds, and also has the obligation to absorb losses of these funds that could potentially be significant to these funds or the right to receive benefits from these funds that could potentially be significant to these funds. Investment Trusts The MUFG Group invests in investment trusts that are professionally managed collective investment schemes which pool money from many investors and invest in, among others, equity and debt securities. Most of these funds take the form of a trust where there is a separation in investment decisions, which is assumed by an investment manager who has no investment in a trust, and ownership through beneficiary interests issued by a trust are owned by investors. Therefore, these investment trusts are considered as VIEs. The MUFG Group consolidates these funds if the MUFG Group has the power to direct the activities of these funds that most significantly impact the economic performance of these funds, and also has the obligation to absorb losses of these funds that could potentially be significant to these funds or the right to receive benefits from these funds that could potentially be significant to these funds. Buy-out The MUFG Group provides financing to buy-out buy-out buy-out buy-out non-investment Other Investment Funds The MUFG Group’s investments in VIEs through MUFG Americas Holdings primarily consist of equity investments in low-income LIHC Unguaranteed Syndicated Investment Funds MUFG Americas Holdings creates the investment funds, serves as the managing investor member, and sells limited investor member interests to third parties. MUFG Americas Holdings receives benefits through income from the structuring of these funds, servicing fees for managing the funds and, as an investor member, tax benefits and tax credits to reduce the MUFG Americas Holdings tax liability. MUFG Americas Holdings considers itself to be the primary beneficiary and consolidates them upon adoption of the current guidance because, as a sponsor and managing member of the funds, it has the power to direct activities that most significantly impact the funds’ economic performance and also has the obligation to absorb losses of the funds that could potentially be significant to the funds. LIHC Guaranteed Syndicated Investment Funds MUFG Americas Holdings also forms limited liability companies, which in turn invest in LIHC operating partnerships, to create LIHC guaranteed syndicated investment funds. Interests in these funds are sold to third parties who pay a premium for a guaranteed return. MUFG Americas Holdings earns structuring fees from the sale of these funds and asset management fees. MUFG Americas Holdings serves as the funds’ sponsor and non-member Special Purpose Entities Created for Structured Financing This category primarily comprises the following: Leasing Transaction Vehicles These entities are established to raise funds to purchase or build equipment and machinery including, among others, commercial vessels, passenger and cargo aircraft, and production equipment for the purpose of leasing them to lessees who use the equipment and machinery as part of their business operations. These entities typically take the form of a limited partnership or a special purpose company where they fund their purchases of equipment and machinery via senior and subordinate financing. When entities take the form of a limited partnership, these entities are considered as VIEs unless limited partners hold substantive kick-out Project Financing Vehicles These entities are established to raise funds in connection with, among others, production of natural resources, construction and development of urban infrastructure (including power plants and grids, highways and ports), and the development of real estate properties or complexes. These projects typically involve special purpose companies which issue senior and subordinate financing to raise funds in connection with the various projects. The subordinate financing is usually provided by parties that will ultimately make use of the assets constructed or developed. By contrast, the senior financing is typically provided by financial institutions, including the MUFG Group. Because the MUFG Group’s participation in these entities is only to provide financing, it does not have the power to direct the activities that most significantly impact the economic performance of these entities. Therefore, the MUFG Group is not considered as the primary beneficiary of these entities and does not consolidate them. Sale-and-Leaseback The MUFG Group is involved with vehicles that acquire assets, primarily real estate, from the MUFG Group’s customers and other unrelated parties where the sellers of the assets continue to use the assets through leaseback agreements. These vehicles typically take the form of a limited partnership, and are considered as VIEs unless the limited partners hold substantive kick-out providing senior financing for the vehicles. Because the MUFG Group’s participation in these vehicles is only to provide senior financing, it does not have the power to direct the activities that most significantly impact the economic performance of these vehicles. Therefore, the MUFG Group is not considered as the primary beneficiary and does not consolidate them. Securitization of Client Real Estate Properties These entities are established for the purpose of securitizing real estate properties held by the MUFG Group’s customers. In most cases, these entities take the form of a limited partnership or a special purpose company. When entities take the form of a limited partnership, these entities are considered as VIEs unless the limited partners hold substantive kick-out Repackaged Instruments This category primarily comprises the following: Investments in Financially-Engineered Products The MUFG Group is involved in special purpose entities that have been established to issue financial products through the engineering and repackaging of existing financial instruments such as collateralized debt obligations ( “ ” In certain instances, special purpose entities have been established and are managed by the MUFG Group. The MUFG Group’s involvement includes establishing and arranging the transaction and underwriting securities issued by the entities to general investors. For these entities, the MUFG Group has the power to direct activities that most significantly impact the economic performance and it has the obligation to absorb losses or receive benefits that could potentially be significant to the entities. As such, the MUFG Group considers itself as the primary beneficiary of these entities and consolidates them. Investments in Securitized Financial Instruments The MUFG Group holds investments in special purpose entities that issue securitized financial products. The assets held by the entities include credit card receivables and residential mortgage loans. These entities are established and managed by parties that are unrelated to the MUFG Group and the MUFG Group’s involvement with these entities is for its own investment purposes. In all cases, the MUFG Group participates as one of many other investors and the MUFG Group does not have the power to direct activities of the entities that most significantly impact the entities’ economic performance. Therefore, the MUFG Group is not considered as the primary beneficiary of these entities and does not consolidate them. Securitization of the MUFG Group’s Assets This category primarily comprises the following: Securitization for issuing interests or financing The MUFG Group establishes entities to securitize its own financial assets that include, among others, corporate and retail loans and lease receivables. The entities used for securitization, which typically take the form of a special purpose company or a trust, are established by the MUFG Group and, in most cases, issue senior and subordinate interests or financing. After securitization, the MUFG Group typically continues to service securitized assets as a servicer. The MUFG Group may also retain subordinate interests or financing or other interests. The MUFG Group is considered as the primary beneficiary and consolidates the entities used for securitization since it has the obligation to absorb losses through subordinate interests, and also has the power for determining and implementing policies as servicer that give it the ability to manage the entities’ assets that become delinquent or are in default in order to improve the economic performance of the entities. Eligible beneficiary interests in housing loan trusts The MUFG Group establishes trusts, which acquire the MUFG Group’s housing loans and in turn issue beneficiary interests to the MUFG Group, to pledge these beneficiary interests as collateral for borrowings from the Bank of Japan, as a result of the decision by the Bank of Japan on June 30, 2016 to accept these beneficial interests as collateral in the same way as it does for Japanese national government bonds. The MUFG Group is considered as the primary beneficiary and consolidates the trusts since it has the obligation to absorb losses through beneficiary interests, and also has the power for determining and implementing policies as servicer that give it the ability to manage housing loans owned by the trusts that become delinquent or are in default in order to improve the economic performance of the trusts. Trust Arrangements The MUFG Group offers, primarily through Mitsubishi UFJ Trust and Banking, a variety of trust products and services including securities investment trusts, pension trusts and trusts used as securitization vehicles. In a typical trust arrangement, however, the MUFG Group manages and administers assets on behalf of the customers in an agency, fiduciary and trust capacity and does not assume risks associated with the entrusted assets. The trusts are generally considered as VIEs because the trust beneficiaries, who provide all of the equity at risk, usually do not have power to direct the activities that most significantly impact its economic performance in the arrangements. The MUFG Group, however, is not considered as the primary beneficiary, mainly, except for the case mentioned below, because it merely receives fees for compensation for its services on terms that are customary for these activities and the fees are insignificant relative to the total amount of the trusts’ economic performance and variability. Therefore, the MUFG Group does not consolidate these entities. With respect to the jointly operated designated money in trusts, Mitsubishi UFJ Trust and Banking pools money from investors and determines how best to invest it. In addition, certain investors, such as money reserve funds and investment funds, place excess funds in the jointly operated designated money trusts. Mitsubishi UFJ Trust and Banking typically invests in high-quality financial assets, including government bonds, corporate bonds and corporate loans including loans to Mitsubishi UFJ Trust and Banking and receives fees as compensation for services. In this role as a sponsor of these trusts’ Mitsubishi UFJ Trust and Banking provides guarantees under which it is required to compensate a loss on the stated principal of the trust beneficial interests. Mitsubishi UFJ Trust and Banking is considered as the primary beneficiary of these trusts’ because it is exposed to a potentially significant amount of losses and also has the power to direct activities of these trusts’ that most significantly impact their economic performance. Upon consolidation of the trusts, the certificates issued to the investors are accounted for as deposit liabilities as the products are structured and marketed to customers similar to Mitsubishi UFJ Trust and Banking’s term deposit products. Mitsubishi UFJ Trust and Banking considers the likelihood of incurring losses on the stated principal guarantee to be highly remote. In the trusts’ operational history that extends over decades, the stated principal guarantee has never been called upon. The variability in fair value of the net assets of the trusts has been primarily affected by the fluctuations in interest rates, and the majority of such variability has been absorbed by investors or trust beneficiaries. Other This category primarily comprises the following: Financing Vehicles of the MUFG Group’s Customers The MUFG Group is involved with several entities that are established by the MUFG Group’s customers. These entities borrow funds from financial institutions and extend loans to their group entities. These entities effectively work as fund-raising vehicles for their respective group entities and enable the groups to achieve efficient financing by integrating their financing activities into a single entity. In all cases, the MUFG Group is not considered as the primary beneficiary because the MUFG Group’s participation in these entities is only to provide financing, and the customers effectively hold the power to direct activities of these entities that most significantly impact the economic performance of the entities. Consequently, the MUFG Group does not consolidate these entities. Funding Vehicles The MUFG Group has established several wholly-owned off-shore Troubled Borrowers During the normal course of business, the borrowers from the MUFG Group may experience financial difficulties and sometimes enter into certain transactions that require the MUFG Group to assess whether they would be considered as VIEs due to their difficult financial position. While in most cases such borrowers are not considered as VIEs when the transactions take place, in limited circumstances they are considered as VIEs due to insufficient equity investment at risk. In all cases, the MUFG Group is not considered as the primary beneficiary because the power to direct activities that most significantly impact the economic performance of the troubled borrowers resides with the management of the troubled borrowers, and the MUFG Group, as a lender, does not have power over or assume any role in management. Therefore, the MUFG Group does not consolidate these troubled borrowers.

Contingent Liabilities _Text Bl

Contingent Liabilities [Text Block]	12 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities [Text Block]	26. CONTINGENT LIABILITIES Repayment of Excess Interest 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 ¥29,438 million and ¥24,943 million as of March 31, 2020 and 2021, respectively. Provision (reversal) related to the allowance is included in Other non-interest 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.

Fees and Commissions Income _Te

Fees and Commissions Income [Text Block]	12 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Fees and Commissions Income [Text Block]	27. FEES AND COMMISSIONS INCOME Disaggregation of Contract Revenue Details of fees and commissions income for the fiscal years ended March 31, 2019, 2020 and 2021 were as follows: 2019 2020 2021 (in millions) Fees and commissions on deposits ¥ 52,624 ¥ 53,684 ¥ 50,131 Fees and commissions on remittances and transfers 168,756 169,407 165,288 Fees and commissions on foreign trading business 73,176 66,025 79,353 Fees and commissions on credit card business 225,877 238,112 199,625 Fees and commissions on security-related services 233,448 221,494 244,017 Fees and commissions on administration and management services for investment funds 147,597 184,559 235,497 Trust fees 115,002 119,919 125,658 Guarantee fees (1) 44,962 46,322 43,889 Insurance commissions 46,918 44,415 42,117 Fees and commissions on real estate business 45,160 49,764 48,110 Other fees and commissions (2) 285,058 308,351 293,598 Total ¥ 1,438,578 ¥ 1,502,052 ¥ 1,527,283 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 The following is an explanation of the relationship with revenue information disclosed for each reportable segment. These revenues from contracts with customers are related to various reportable segments disclosed in Note 29. 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 Japanese GAAP as adjusted in accordance with internal management accounting rules and practices. Further, the format and information as disclosed in Note 29 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. The majority of fees and commissions on deposits are from the business activities relevant to Retail & Commercial Banking Business Group (“R&C”), with Global Commercial Banking Business Group (“GCB”) providing a smaller impact. The business activities relevant to fees and commissions on remittances and transfers are attributable to R&C, Japanese Corporate Investment Banking Business Group (“JCIB”), Global Corporate Investment Banking Business Group (“GCIB”), and GCB with no significant concentration in any particular segments. The business activities relevant to fees and commissions on foreign trading business are attributable to R&C, JCIB, GCIB, and GCB with no significant concentration in any particular segments. The business activities relevant to fees and commissions on credit card business are substantially attributable to R&C. The majority of fees and commissions on security-related services are from the business activities relevant to R&C, with JCIB and GCIB providing a smaller impact. The business activities relevant to fees and commissions on administration and management services for investment funds are substantially attributable to Asset Management & Investor Service Business Group (“AM/IS”). The business activities relevant to trust fees are attributable to R&C, JCIB, and AM/IS with no significant concentration in any particular segments. The majority of insurance commissions are from the business activities relevant to R&C, with GCB providing a smaller impact. The business activities relevant to fees and commissions on real estate business are attributable to R&C and JCIB with no significant concentration in any particular segments.

Trading Account Profits and Los

Trading Account Profits and Losses [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Trading Account Profits and Losses [Text Block]	28. TRADING ACCOUNT PROFITS AND LOSSES The MUFG Group performs trading activities through market-making, sales and arbitrage, while maintaining risk levels within appropriate limits in accordance with its risk management policy. The MUFG Group has trading account securities and trading derivative assets and liabilities for this purpose. In addition, the trading account securities include foreign currency-denominated debt securities such as foreign government or official institution bonds, corporate bonds and mortgage-backed securities, which are mainly comprised of securities measured at fair value under the fair value option. Net trading gains (losses) for the fiscal years ended March 31, 2019, 2020 and 2021 were comprised of the following: 2019 2020 2021 (in millions) Interest rate and other derivative contracts ¥ (24,031 ) ¥ (159,045 ) ¥ (429,586 ) Trading account securities, excluding derivatives 192,931 924,418 19,218 Trading account profits (losses)—net 168,900 765,373 (410,368 ) Foreign exchange derivative contracts (1) (354,401 ) (434,052 ) (79,559 ) Net trading gains (losses) ¥ (185,501 ) ¥ 331,321 ¥ (489,927 ) Note: (1) Losses on foreign exchange derivative contracts are included in Foreign exchange gains (losses)—net in the accompanying consolidated statements of income. Foreign exchange gains (losses)—net in the accompanying consolidated statements of income are also comprised of foreign exchange gains (losses) other than derivative contracts and foreign exchange gains (losses) related to the fair value option. For further information on the methodologies and assumptions used to estimate fair value, see Note 31, which also shows fair values of trading account securities by major category. Note 23 discloses further information regarding the derivative-related impact on Trading account profits (losses)—net by major category.

Business Segments _Text Block_

Business Segments [Text Block]	12 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Business Segments [Text Block]	29. 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 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. See Note 30 for financial information relating to the MUFG Group’s operations by geographic area. The geographic financial information is consistent with the basis of the accompanying consolidated financial statements. 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. The MUFG Group made modifications to its internal management accounting rules and practices to clarify the responsibility for profits of each business segment, effective April 1, 2020. Major rule changes are (i) allocation of adjustments related to the derivative counterparty risk previously included in Other to the Global Markets Business Group, which holds the derivative assets, and (ii) reorganization of functions between the Retail & Commercial Banking Business Group, the Japanese Corporate & Investment Banking Business Group, the Global Corporate & Investment Banking Business Group and Other due to refinement of the business segment definition. These modifications had the following impact for the fiscal years ended March 31, 2019 and 2020: • increasing the operating profits of Other, the Global Corporate & Investment Banking Business Group and the Japanese Corporate & Investment Banking Business Group by ¥33.8 billion, • reducing the operating profits of the Global Markets Business Group, the Retail & Commercial Banking Business Group and the Global Commercial Banking Business Group by ¥46.3 billion, ¥19.1 billion and ¥2.8 billion, respectively for the fiscal year ended March 31, 2019, • increasing the operating profits of Other, the Japanese Corporate & Investment Banking Business Group and the Global Corporate & Investment Banking Business Group by ¥25.5 • reducing the operating profits of the Global Markets Business Group, the Retail & Commercial Banking Business Group and the Global Commercial Banking Business Group by ¥40.2 billion, ¥9.0 billion and ¥1.7 billion, respectively for the fiscal year ended March 31, 2020, Prior period business segment information has been restated to enable comparison between the relevant amounts for the fiscal years ended March 31, 2019, 2020 and 2021. Customer Business Global Other Total Retail & Japanese Global Global Asset Total (in billions) Fiscal year ended March 31, 2019: Net revenue: ¥ 1,502.5 ¥ 569.6 ¥ 417.4 ¥ 682.0 ¥ 203.0 ¥ 3,374.5 ¥ 436.0 ¥ (11.4 ) ¥ 3,799.1 BK and TB (1) 718.9 436.9 279.2 (1.3 ) 93.2 1,526.9 259.8 74.3 1,861.0 Net interest income 458.2 175.8 120.6 (1.3 ) — 753.3 201.1 190.8 1,145.2 Net fees 229.8 202.9 158.0 — 93.2 683.9 (16.6 ) (46.4 ) 620.9 Other 30.9 58.2 0.6 — — 89.7 75.3 (70.1 ) 94.9 Other than BK and TB 783.6 132.7 138.2 683.3 109.8 1,847.6 176.2 (85.7 ) 1,938.1 Operating expenses 1,220.9 319.5 254.9 477.8 124.6 2,397.7 226.0 103.1 2,726.8 Operating profit (loss) ¥ 281.6 ¥ 250.1 ¥ 162.5 ¥ 204.2 ¥ 78.4 ¥ 976.8 ¥ 210.0 ¥ (114.5 ) ¥ 1,072.3 Fiscal year ended March 31, 2020: Net revenue: ¥ 1,485.5 ¥ 572.7 ¥ 402.2 ¥ 795.4 ¥ 243.0 ¥ 3,498.8 ¥ 536.0 ¥ 19.8 ¥ 4,054.6 BK and TB (1) 706.6 439.1 287.1 (0.4 ) 94.6 1,527.0 319.3 31.9 1,878.2 Net interest incom e 444.4 185.7 121.4 0.4 2.5 754.4 129.5 46.4 930.3 Net fees 231.8 203.2 148.1 — 92.2 675.3 (14.8 ) (55.1 ) 605.4 Other 30.4 50.2 17.6 (0.8 ) (0.1 ) 97.3 204.6 40.6 342.5 Other than BK and TB 778.9 133.6 115.1 795.8 148.4 1,971.8 216.7 (12.1 ) 2,176.4 Operating expenses 1,195.9 324.4 260.8 564.3 171.7 2,517.1 233.2 129.3 2,879.6 Operating profit (loss) ¥ 289.6 ¥ 248.3 ¥ 141.4 ¥ 231.1 ¥ 71.3 ¥ 981.7 ¥ 302.8 ¥ (109.5 ) ¥ 1,175.0 Fiscal year ended March 31, 2021: Net revenue: ¥ 1,389.4 ¥ 559.9 ¥ 426.3 ¥ 783.2 ¥ 293.5 ¥ 3,452.3 ¥ 634.8 ¥ (4.8 ) ¥ 4,082.3 BK and TB (1) 645.1 448.8 269.3 0.8 99.4 1,463.4 389.0 30.4 1,882.8 Net interest income 405.2 183.8 133.2 1.5 5.5 729.2 213.1 34.1 976.4 Net fees 216.4 216.8 150.2 — 94.0 677.4 (4.3 ) (66.8 ) 606.3 Other 23.5 48.2 (14.1 ) (0.7 ) (0.1 ) 56.8 180.2 63.1 300.1 Other than BK and TB 744.3 111.1 157.0 782.4 194.1 1,988.9 245.8 (35.2 ) 2,199.5 Operating expenses 1,130.4 319.3 269.8 509.0 210.1 2,438.6 234.0 161.1 2,833.7 Operating profit (loss) ¥ 259.0 ¥ 240.6 ¥ 156.5 ¥ 274.2 ¥ 83.4 ¥ 1,013.7 ¥ 400.8 ¥ (165.9 ) ¥ 1,248.6 Note: (1) “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 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 consolidated statements of income. A reconciliation of operating profit under the internal management reporting system for the fiscal years ended March 31, 2019, 2020 and 2021 above to income before income tax expense shown in the accompanying consolidated statements of income is as follows: 2019 2020 2021 (in billions) Operating profit: ¥ 1,072 ¥ 1,175 ¥ 1,249 Provision for credit losses (34 ) (322 ) (484 ) Trading account profits (losses)—net 182 920 (678 ) Equity investment securities gains (losses)—net (305 ) (618 ) 1,480 Debt investment securities losses—net (3 ) (403 ) (129 ) Foreign exchange gains (losses)—net 47 (145 ) 9 Equity in earnings of equity method investees—net 210 283 356 Impairment of goodwill — (384 ) (148 ) Impairment of intangible assets (118 ) (4 ) (22 ) Reversal of (provision for) off-balance (38 ) 62 57 Other—net (142 ) (131 ) (82 ) Income before income tax expense ¥ 871 ¥ 433 ¥ 1,608

Foreign Activities _Text Block_

Foreign Activities [Text Block]	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Foreign Activities [Text Block]	30. FOREIGN ACTIVITIES Foreign operations include the business conducted by overseas offices, as well as international business conducted from domestic offices, principally several international banking-related divisions of MUFG Bank’s and Mitsubishi UFJ Trust and Banking’s head office in Tokyo, and involve various transactions with debtors and customers residing outside Japan. Close integration of the MUFG Group’s foreign and domestic activities makes precise estimates of the amounts of assets, liabilities, income and expenses attributable to foreign operations difficult and necessarily subjective. Assets, income and expenses attributable to foreign operations are allocated to geographical areas based on the domicile of the debtors and customers. Generally, interest rates with respect to funds borrowed and loaned between domestic and foreign operations are based on prevailing money market rates appropriate for the transactions. In general, the MUFG Group has allocated all direct expenses and a proportionate share of general and administrative expenses to income derived from foreign loans and other transactions by the MUFG Group’s foreign operations. The following table sets forth estimated total assets at March 31, 2019, 2020 and 2021, and estimated total revenue, total expense, income (loss) before income tax expense (benefit) and net income (loss) attributable to Mitsubishi UFJ Financial Group for the respective fiscal years then ended: Domestic Foreign Total Japan United Europe Asia/ Other (1) (in millions) Fiscal year ended March 31, 2019: Total revenue (2) ¥ 1,886,469 ¥ 1,637,569 ¥ 222,267 ¥ 1,157,946 ¥ 504,372 ¥ 5,408,623 Total expense (3) 2,204,147 1,012,978 173,934 892,729 253,993 4,537,781 Income (loss) before income tax expense (benefit) (317,678 ) 624,591 48,333 265,217 250,379 870,842 Net income (loss) attributable to Mitsubishi UFJ Financial Group (345,148 ) 573,698 50,877 214,582 224,636 718,645 Total assets at end of fiscal year 194,070,495 49,987,389 21,535,278 27,992,986 11,642,751 305,228,899 Fiscal year ended March 31, 2020: Total revenue (2) ¥ 1,596,794 ¥ 2,223,984 ¥ 89,412 ¥ 1,326,426 ¥ 566,222 ¥ 5,802,838 Total expense (3) 2,565,895 1,051,164 218,623 1,174,200 359,736 5,369,618 Income (loss) before income tax expense (benefit) (969,101 ) 1,172,820 (129,211 ) 152,226 206,486 433,220 Net income (loss) attributable to Mitsubishi UFJ Financial Group (1,001,477 ) 1,113,913 (140,372 ) 142,568 191,323 305,955 Total assets at end of fiscal year 207,532,337 60,587,867 19,099,410 30,845,864 13,687,805 331,753,283 Fiscal year ended March 31, 2021: Total revenue (2) ¥ 3,348,733 ¥ 741,137 ¥ 356,112 ¥ 1,134,233 ¥ 329,568 ¥ 5,909,783 Total expense (3) 2,316,323 713,441 263,753 889,494 118,430 4,301,441 Income before income tax expense 1,032,410 27,696 92,359 244,739 211,138 1,608,342 Net income (loss) attributable 627,138 (231,116 ) 74,230 366,880 280,166 1,117,298 Total assets at end of fiscal year 240,603,939 49,478,851 21,126,639 31,368,443 11,246,753 353,824,625 Notes: (1) Other areas primarily include Canada, Latin America, the Caribbean and the Middle East. (2) Total revenue is comprised of Interest income and Non-interest (3) Total expense is comprised of Interest expense, Provision for (reversal of) credit losses and Non-interest The following is an analysis of certain asset and liability accounts related to foreign activities at March 31, 2020 and 2021: 2020 2021 (in millions) Cash and due from banks ¥ 971,870 ¥ 1,090,501 Interest-earning deposits in other banks 12,662,558 12,377,887 Total ¥ 13,634,428 ¥ 13,468,388 Trading account assets ¥ 31,374,451 ¥ 28,525,243 Investment securities ¥ 9,040,512 ¥ 8,694,138 Loans—net of unearned income, unamortized premiums and deferred loan fees ¥ 53,079,542 ¥ 47,333,878 Deposits ¥ 49,291,478 ¥ 55,145,437 Funds borrowed: Call money, funds purchased ¥ 276,040 ¥ 323,066 Payables under repurchase agreements 13,476,026 10,974,238 Payables under securities lending transactions 176,998 130,380 Other short-term borrowings 4,733,138 3,474,821 Long-term debt 2,733,242 2,421,267 Total ¥ 21,395,444 ¥ 17,323,772 Trading account liabilities ¥ 6,575,570 ¥ 5,575,956

Fair Value _Text Block_

Fair Value [Text Block]	12 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value [Text Block]	31. FAIR VALUE Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The guidance on fair value measurements also specifies a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The fair value hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable inputs, for example, the reporting entity’s own data. Based on the observability of the inputs used in the valuation techniques, the following three-level hierarchy is specified by the guidance: • Level 1—Unadjusted quoted prices for identical instruments in active markets. • Level 2—Observable inputs other than Level 1 prices for substantially the full term of the instruments, such as quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; other inputs that are observable; or market-corroborated inputs. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the instruments. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The MUFG Group has an established and documented process for determining fair values in accordance with the guidance. When available, quoted prices are used to determine fair value. If quoted prices are not available, fair value is based upon valuation techniques that use observable or unobservable inputs. The fair values of liabilities are determined by discounting future cash flows at a rate which incorporates the MUFG Group’s own creditworthiness. In addition, valuation adjustments may be made to ensure the financial instruments are recorded at fair value. These adjustments include, but are not limited to, amounts that reflect counterparty credit quality, funding cost, liquidity risk and model risk. The following section describes the valuation techniques used by the MUFG Group to measure fair values of certain financial instruments. The discussion includes the general classification of such financial instruments in accordance with the fair value hierarchy, a brief explanation of the valuation techniques, the significant inputs to those valuation techniques, and any additional significant assumptions. Trading Account Assets and Liabilities—Trading Account Securities When quoted prices are available in an active market, the MUFG Group uses quoted prices to measure the fair values of securities and such securities are classified in Level 1 of the fair value hierarchy. Examples of Level 1 securities include certain Japanese and foreign government bonds, and marketable equity securities. When quoted prices are available but the securities are not traded in active markets, such securities are classified in Level 2 of the fair value hierarchy. These securities include certain Japanese government agency bonds, Japanese prefectural and municipal bonds, foreign government and official institution bonds, corporate bonds, residential mortgage-backed securities and equity securities. As for quoted prices provided by third-party vendors, independent price verification is performed by the MUFG group to determine the quality and reliability of the data for fair value measurement purposes. As part of its independent price verification procedures, the MUFG group obtains a sufficient understanding of the vendors’ pricing sources and valuation processes. Further, the MUFG group performs internal price verification procedures to ensure that the quoted prices provided from the third-party vendors are reasonable. Such verification procedures include comparison of pricing sources and analysis of variances beyond certain thresholds. When quoted prices are not available, the MUFG Group estimates fair values by using an internal model, quoted prices of securities with similar characteristics or non-binding non-binding When there is less liquidity for securities or significant inputs used in the fair value measurements are unobservable, such securities are classified in Level 3 of the fair value hierarchy. Examples of such Level 3 securities include CLOs backed by general corporate loans, which are classified in asset-backed securities. The fair value of CLOs is measured by weighing the estimated fair value amounts from the internal model and the non-binding value calculation with consideration given to transaction volume. Key inputs to the internal model include projected cash flows through an analysis of underlying loans, probability of default which incorporates market indices such as LCDX (which is an index of loan credit default swaps), prepayment rates and discount rates reflecting liquidity premiums based on historical market data. Trading Account Assets and Liabilities—Derivatives Exchange-traded derivatives valued using quoted prices are classified in Level 1 of the fair value hierarchy. Examples of Level 1 derivatives include stock futures index and interest rate futures. However, the majority of the derivative contracts entered into by the MUFG Group are traded over-the-counter Derivatives that are valued using valuation techniques with significant unobservable inputs are classified in Level 3 of the fair value hierarchy. Examples of Level 3 derivatives include long-term interest rate or currency swaps and certain credit derivatives, where significant inputs such as volatility and correlation of such inputs are unobservable. Investment Securities Investment securities include Available-for-sale Other Assets Other assets measured at fair value mainly consist of 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 derivatives designated as hedging instruments. The securities received as collateral under lending transactions mainly consist of certain Japanese and foreign government bonds which are valued using the valuation techniques previously described in the section entitled “Trading Accounts Assets and Liabilities—Trading Account Securities” Money in trust for segregating cash deposited by customers on security transactions mainly consists of certain Japanese government bonds which are valued using the valuation techniques described in the “Trading Account Assets and Liabilities—Trading Account Securities” The fair values of derivatives designated as hedging instruments are measured using the valuation techniques described in the “Trading Account Assets and Liabilities—Derivatives” Obligations to Return Securities Received as Collateral Obligations to return securities received as collateral under securities lending transactions included in Other liabilities are measured at the fair values of the securities received as collateral. The securities received as collateral consist primarily of certain Japanese and foreign government bonds, whose fair values are measured using the valuation techniques described in the “Trading Account Assets and Liabilities—Trading Account Securities” Other Short-term Borrowings and Long-term Debt Certain short-term borrowings and long-term debt are measured at fair value due to the election of the fair value option. The fair value of these instruments are measured principally based on the discounted cash flows. Where the inputs into the valuation techniques are mainly based on observable inputs, these instruments are classified in Level 2 of the fair value hierarchy. Where significant inputs are unobservable, they are classified in Level 3 of the fair value hierarchy. Market Valuation Adjustments Counterparty credit risk adjustments are made to certain financial assets such as over-the-counter Funding valuation adjustment (“FVA”) represents the adjustment to reflect the impact of uncollateralized funding. The FVA is calculated using the MUFG’s market funding spread and the funding exposure of any uncollateralized component of the over-the-counter Liquidity adjustments are applied mainly to the instruments classified in Level 3 of the fair value hierarchy when recent observable prices of such instruments are not available or such instruments are traded in inactive or less active markets. The liquidity adjustments are based on the facts and circumstances of the markets including the availability of external quotes and the time since the latest available quote. Model valuation adjustments such as unobservable parameter valuation adjustments may be provided when the fair values of instruments are determined based on internally developed valuation techniques. Examples of such adjustments include adjustments to the model price of certain derivatives where parameters such as correlation are unobservable. Unobservable parameter valuation adjustments are applied to mitigate the uncertainty inherent in the resulting valuation estimate. Investments in Certain Entities That Calculate Net Asset Value per Share The MUFG Group has interests in investment funds mainly private equity funds, and real estate funds that are measured at fair value on a recurring or nonrecurring basis. Private equity funds have specific investment objectives in connection with their acquisition of equity interests, such as providing financing and other support to start-up Real estate funds invest globally and primarily in real estate companies, debt recapitalizations and direct property. These investments are generally not redeemable with the funds. Distributions from each fund will be received as the underlying investments of the funds are liquidated, the timing of which is uncertain. 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, 2020 and 2021: At March 31, 2020 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 14,891,635 ¥ 17,061,985 ¥ 525,946 ¥ 32,479,566 Debt securities Japanese national government and Japanese government agency bonds 3,805,039 350,128 — 4,155,167 Japanese prefectural and municipal bonds — 93,479 — 93,479 Foreign government and official institution bonds 9,356,427 417,766 1,052 9,775,245 Corporate bonds 11 2,537,559 144 2,537,714 Residential mortgage-backed securities — 9,037,539 — 9,037,539 Asset-backed securities — 590,556 416,259 1,006,815 Other debt securities — 7,787 6,651 14,438 Commercial paper — 2,959,580 — 2,959,580 Equity securities (2) 1,730,158 1,067,591 101,840 2,899,589 Trading derivative assets 216,834 14,680,632 60,108 14,957,574 Interest rate contracts 74,488 10,758,790 13,329 10,846,607 Foreign exchange contracts 1,550 3,723,087 9,046 3,733,683 Equity contracts 140,796 87,285 7,491 235,572 Commodity contracts — 10 27,492 27,502 Credit derivatives — 111,460 2,750 114,210 Investment securities: Available-for-sale 22,126,881 11,798,392 274,930 34,200,203 Japanese national government and Japanese government agency bonds 19,897,187 3,565,692 — 23,462,879 Japanese prefectural and municipal bonds — 2,952,820 — 2,952,820 Foreign government and official institution bonds 2,229,694 792,027 15,767 3,037,488 Corporate bonds — 1,262,718 10,108 1,272,826 Residential mortgage-backed securities — 1,459,378 15 1,459,393 Commercial mortgage-backed securities — 380,278 1,977 382,255 Asset-backed securities — 1,328,601 140,875 1,469,476 Other debt securities — 56,878 106,188 163,066 Equity securities 4,471,499 296,819 39,963 4,808,281 Marketable equity securities 4,471,499 296,819 — 4,768,318 Nonmarketable equity securities (3) — — 39,963 39,963 Other (4) 1,054,186 45,913 36,701 1,136,800 Total ¥ 42,761,035 ¥ 43,883,741 ¥ 937,648 ¥ 87,582,424 At March 31, 2020 Level 1 Level 2 Level 3 Fair Value (in millions) Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 555,664 ¥ 3,718 ¥ — ¥ 559,382 Trading derivative liabilities 300,215 13,851,205 56,631 14,208,051 Interest rate contracts 153,098 10,038,198 14,079 10,205,375 Foreign exchange contracts 3,360 3,596,589 4,041 3,603,990 Equity contracts 143,757 121,229 11,713 276,699 Commodity contracts — 14 26,775 26,789 Credit derivatives — 95,175 23 95,198 Obligation to return securities received as collateral (5) 4,663,068 143,103 — 4,806,171 Other (6) — 514,003 6,606 520,609 Total ¥ 5,518,947 ¥ 14,512,029 ¥ 63,237 ¥ 20,094,213 At March 31, 2021 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 18,439,146 ¥ 13,165,127 ¥ 756,413 ¥ 32,360,686 Debt securities Japanese national government and Japanese government agency bonds 6,800,379 401,454 — 7,201,833 Japanese prefectural and municipal bonds — 193,936 — 193,936 Foreign government and official institution bonds 9,508,030 450,443 1,280 9,959,753 Corporate bonds 5,123 2,706,611 77 2,711,811 Residential mortgage-backed securities 27 6,166,313 1,000 6,167,340 Asset-backed securities — 1,045,706 336,811 1,382,517 Other debt securities — — 277,635 277,635 Commercial paper — 1,001,233 — 1,001,233 Equity securities (2) 2,125,587 1,199,431 139,610 3,464,628 Trading derivative assets 136,515 11,774,865 70,058 11,981,438 Interest rate contracts 23,906 7,673,031 21,018 7,717,955 Foreign exchange contracts 929 3,896,713 12,520 3,910,162 Equity contracts 111,680 113,586 6,309 231,575 Commodity contracts — 1 26,896 26,897 Credit derivatives — 91,534 2,354 93,888 Other (7) — — 961 961 Investment securities: Available-for-sale 34,010,613 12,817,584 289,616 47,117,813 Japanese national government and Japanese government agency bonds 32,073,409 3,199,802 — 35,273,211 Japanese prefectural and municipal bonds — 3,731,513 — 3,731,513 Foreign government and official institution bonds 1,937,204 973,041 16,718 2,926,963 Corporate bonds — 1,134,108 162 1,134,270 Residential mortgage-backed securities — 1,467,115 15 1,467,130 Commercial mortgage-backed securities — 462,966 1,599 464,565 Asset-backed securities — 1,247,565 136,920 1,384,485 Other debt securities — 37,376 134,202 171,578 Commercial paper — 564,098 — 564,098 Equity securities 5,530,077 229,415 45,569 5,805,061 Marketable equity securities 5,530,077 229,415 — 5,759,492 Nonmarketable equity securities (3) — — 45,569 45,569 Other (4) 1,202,230 42,687 18,784 1,263,701 Total ¥ 59,318,581 ¥ 38,029,678 ¥ 1,180,440 ¥ 98,528,699 At March 31, 2021 Level 1 Level 2 Level 3 Fair Value (in millions) Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 260,149 ¥ 989 ¥ — ¥ 261,138 Trading derivative liabilities 150,750 11,560,634 45,031 11,756,415 Interest rate contracts 10,696 7,343,594 6,839 7,361,129 Foreign exchange contracts 977 4,015,927 5,237 4,022,141 Equity contracts 139,077 92,655 5,686 237,418 Commodity contracts — 1 26,959 26,960 Credit derivatives — 108,457 83 108,540 Other (7) — — 227 227 Obligation to return securities received as collateral (5) 6,484,452 97,307 — 6,581,759 Other (6) — 558,553 (2,212 ) 556,341 Total ¥ 6,895,351 ¥ 12,217,483 ¥ 42,819 ¥ 19,155,653 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 were ¥66,918 million and ¥102,255 million at March 31, 2020 and 2021, respectively. The amounts of unfunded commitments related to these private equity funds were ¥102,743 million and ¥97,413 million at March 31, 2020 and 2021, respectively. (3) Excludes certain investments valued at net asset value of real estate funds and private equity and and (4) Mainly comprises securities received as collateral that may be sold or repledged under securities lending transactions and money in trust for segregating cash deposited by customers on security transactions. (5) Included in Other liabilities. (6) Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments. (7) For the period ended March 31, 2021, certain derivatives such as earthquake derivatives previously included in Commodity contracts are separately disclosed in Other of Trading derivative assets and liabilities. 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 fiscal years ended March 31, 2020 and 2021. 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. March 31, Total gains (losses) Purchases Issues Sales Settlements Transfers Transfers March 31, Change in Included Included (in millions) Asset s Trading account assets: Trading securities (1) ¥ 785,326 ¥ (22,419 ) (2) ¥ — ¥ 227,656 ¥ — ¥ (214,183 ) ¥ (225,980 ) ¥ 52,140 ¥ (76,594 ) ¥ 525,946 ¥ (18,915 ) (2) Debt securities Foreign government and official institution bonds 792 589 — 93,957 — (92,748 ) (18 ) — (1,520 ) 1,052 (12 ) Corporate bonds 31,384 (279 ) — 631 — (3,937 ) (4,721 ) 24,882 (5) (47,816 ) (5) 144 (13 ) Residential mortgage-backed securities 35,181 (695 ) — — — (23,837 ) (10,649 ) — — — — Asset-backed securities 627,678 (23,494 ) — 113,239 — (93,655 ) (207,509 ) — — 416,259 (18,815 ) Other debt securities 35,148 (1,239 ) — — — — — — (27,258 ) (8) 6,651 (387 ) Equity securities 55,143 2,699 — 19,829 — (6 ) (3,083 ) 27,258 (8) — 101,840 312 Trading derivatives—net 36,170 4,503 (2) 178 714 (1,449 ) — (33,463 ) 40,857 (44,033 ) 3,477 (16,742 ) (2) Interest rate contracts—net (4,189 ) 21,290 (24 ) — — — (12,025 ) 2,254 (8,056 ) (750 ) 8,046 Foreign exchange contracts—net 18,191 (21,429 ) 89 3 — — 4,858 35,444 (5) (32,151 ) (5) 5,005 (21,483 ) Equity contracts—net 2,862 5,188 110 96 (777 ) — (11,305 ) (41 ) (355 ) (4,222 ) (2,846 ) Commodity contracts—net 949 (174 ) (1 ) 615 (672 ) — — — — 717 (167 ) Credit derivatives—net 18,357 (372 ) 4 — — — (14,991 ) 3,200 (3,471 ) 2,727 (292 ) Investment securities: Available-for-sale 283,434 (2,402 ) (3) 804 281,041 — (24 ) (300,023 ) 15,201 (3,101 ) 274,930 (934 ) (3) Foreign government and official institution bonds 19,246 — 1,625 828 — — (5,932 ) — — 15,767 — Corporate bonds 4,196 (458 ) 342 663 — (1 ) (6,734 ) 15,201 (5) (3,101 ) (5) 10,108 (934 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed 2,038 — 125 — — (23 ) (163 ) — — 1,977 — Asset-backed securities 131,455 (1,944 ) (1,085 ) 274,110 — — (261,661 ) — — 140,875 — Other debt securities 126,484 — (203 ) 5,440 — — (25,533 ) — — 106,188 — Equity securities 27,820 2,585 (3) — 12,718 — (2,527 ) (35 ) — (598 ) 39,963 863 (3) Nonmarketable equity securities 27,820 2,585 — 12,718 — (2,527 ) (35 ) — (598 ) 39,963 863 Other 32,378 (10,105 ) (7) (375 ) 44,324 — (29,334 ) (187 ) — — 36,701 (10,136 ) (7) Total ¥ 1,165,128 ¥ (27,838 ) ¥ 607 ¥ 566,453 ¥ (1,449 ) ¥ (246,068 ) ¥ (559,688 ) ¥ 108,198 ¥ (124,326 ) ¥ 881,017 ¥ (45,864 ) Liabilities Other ¥ 65,648 ¥ (5,388 ) (4) ¥ (414 ) ¥ — ¥ 2,258 ¥ — ¥ (21,133 ) ¥ 333 (6) ¥ (46,302 ) (6) ¥ 6,606 ¥ 9,648 (4) Total ¥ 65,648 ¥ (5,388 ) ¥ (414 ) ¥ — ¥ 2,258 ¥ — ¥ (21,133 ) ¥ 333 ¥ (46,302 ) ¥ 6,606 ¥ 9,648 March 31, Total gains (losses) Purchases Issues Sales Settlements Transfers Transfers March 31, Change in Included Included (in millions) Asset s Trading account assets: Trading securities (1) ¥ 525,946 ¥ 21,730 (2) ¥ — ¥ 352,917 ¥ — ¥ (189,980 ) ¥ (117,399 ) ¥ 190,391 ¥ (27,192 ) ¥ 756,413 ¥ 23,477 (2) Debt securities Foreign government and official institution bonds 1,052 625 — 49,637 — (49,927 ) (59 ) — (48 ) 1,280 159 Corporate bonds 144 31 — 82 — (180 ) — — — 77 (5 ) Residential mortgage-backed securities — — — 51,533 — (50,533 ) — — — 1,000 — Asset-backed securities 416,259 12,808 — 106,308 — (83,700 ) (114,864 ) — — 336,811 16,309 Other debt securities 6,651 11,096 — 69,499 — — — 190,389 (8) — 277,635 11,096 Equity securities 101,840 (2,830 ) — 75,858 — (5,640 ) (2,476 ) 2 (27,144 ) (8) 139,610 (4,082 ) Trading derivatives—net 3,477 45,361 (2) (104 ) 597 (653 ) — (20,689 ) (2,159 ) (803 ) 25,027 31,184 (2) Interest rate contracts—net (750 ) 14,401 (32 ) — — — 1,405 (99 ) (746 ) 14,179 11,807 Foreign exchange contracts—net 5,005 3,743 (128 ) — — — 140 (1,480 ) 3 7,283 3,812 Equity contracts—net (4,222 ) 27,299 55 3 — — (21,944 ) (580 ) 12 623 15,660 Commodity contracts—net (65 ) 1 1 — — — — — — (63 ) 1 Credit derivatives—net 2,727 (166 ) — — — — (290 ) — — 2,271 (182 ) Other—net (9) 782 83 — 594 (653 ) — — — (72 ) 734 86 Investment securities: Available-for-sale 274,930 6,710 (3) (14,559 ) 308,672 — (11 ) (276,234 ) 70 (9,962 ) 289,616 (2,779 ) (3) Foreign government and official institution bonds 15,767 — (888 ) 3,518 — — (1,679 ) — — 16,718 473 Corporate bonds 10,108 (8 ) (1 ) — — — (45 ) 70 (9,962 ) (5) 162 (10 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed 1,977 — (346 ) — — (11 ) (21 ) — — 1,599 (163 ) Asset-backed securities 140,875 6,718 (7,958 ) 267,767 — — (270,482 ) — — 136,920 (4,047 ) Other debt securities 106,188 — (5,366 ) 37,387 — — (4,007 ) — — 134,202 968 Equity securities 39,963 (3,231 ) (3) — 10,481 — (1,725 ) — 285 (204 ) 45,569 (4,150 ) (3) Nonmarketable equity securities 39,963 (3,231 ) — 10,481 — (1,725 ) — 285 (204 ) 45,569 (4,150 ) Other 36,701 (18,626 ) (7) (1,349 ) 2,346 — (18 ) (270 ) — — 18,784 (18,620 ) (7) Total ¥ 881,017 ¥ 51,944 ¥ (16,012 ) ¥ 675,013 ¥ (653 ) ¥ (191,734 ) ¥ (414,592 ) ¥ 188,587 ¥ (38,161 ) ¥ 1,135,409 ¥ 29,112 Liabilities Other ¥ 6,606 ¥ (32,946 ) (4) ¥ 937 ¥ — ¥ 5,336 ¥ — ¥ (27,823 ) ¥ (7,686 ) (6) ¥ (10,654 ) (6) ¥ (2,212 ) ¥ (17,043 ) (4) Total ¥ 6,606 ¥ (32,946 ) ¥ 937 ¥ — ¥ 5,336 ¥ — ¥ (27,823 ) ¥ (7,686 ) ¥ (10,654 ) ¥ (2,212 ) ¥ (17,043 ) Notes: (1) Includes Trading securities measured under the fair value option. (2) Included in Trading account profits (losses)—net and Foreign exchange gains (losses)—net. (3) Included in Investment securities gains (losses)—net and Other comprehensive income—net. (4) Included in Trading account profits (losses)—net. (5) Transfers into (out of) Level 3 for Foreign exchange contracts—net were mainly caused by the valuation using certain unobservable input. For the fiscal year ended March 31, 2020, 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 vendors. For the fiscal year ended March 31, 2021, transfers out of Level 3 for Corporate bonds were due to changes in the impact of unobservable credit worthiness inputs to the entire fair value measurement of the private placement bonds issued by Japanese non-public (6) Transfers into (out of) Level 3 for long-term debt in Other were mainly caused by the decrease (increase) in the observability of the key inputs to the valuation models and a corresponding increase (decrease) in the significance of the unobservable inputs. (7) Included in Fees and commissions income and Other non-interest (8) Transfers relate to the reclassification of certain securities. (9) For the fiscal year ended March 31, 2021, certain derivatives such as earthquake derivatives previously included in Commodity contracts—net are separately disclosed in Other—net of Trading derivatives—net. 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, 2020 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign government and official institution bonds ¥ 15,767 Return on equity method Probability of default 0.2%~1.3% 0.4% Recovery rate 55.0%~90.0% 69.9% Market-required return on capital 8.0%~10.0% 9.9% Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 92,025 Discounted cash flow Probability of default 1.2%~5.3% 5.0% Recovery rate 60.0%~76.0% 68.2% 389,170 Internal model (4) Asset correlations 1.0% 1.0% Discount factor 1.1%~1.4% 1.4% Prepayment rate 21.0% 21.0% Probability of default 0.0%~99.0% — (3) Recovery rate 57.8% 57.8% Other debt securities 6,651 Discounted cash flow Liquidity premium 2.4% 2.4% 86,734 Return on equity method Probability of default 0.0%~25.0% 0.3% Recovery rate 60.0%~90.0% 79.8% Market-required return on capital 8.0%~10.0% 9.4% Equity securities 27,144 Discounted cash flow Liquidity premium 1.0% 1.0% At March 31, 2020 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net (728 ) Option model Correlation between interest rates 32.9%~62.5% Correlation between interest rate and foreign exchange rate 16.7%~60.0% Volatility 0.0%~100.0% Foreign exchange 5,005 Option model Correlation between interest rates 30.0%~70.0% Correlation between interest rate and foreign exchange rate 15.8%~60.0% Correlation between foreign exchange rates 60.0% Volatility 7.5%~17.0% Equity contracts—net (10,038 ) Option model Correlation between foreign exchange rate and equity (58.4)%~56.9% Correlation between equities 19.5%~81.0% Volatility 24.2%~32.0% 6,166 Discounted cash flow Term of litigation 0.1 year~1.1 years At March 31, 2021 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign government and official institution bonds ¥ 16,718 Return on equity method Probability of default 0.2%~1.8% 0.5% Recovery rate 35.0%~90.0% 66.9% Market-required return on capital 8.0%~10.0% 10.0% Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 89,607 Discounted cash flow Probability of default 4.3%~4.9% 4.7% Recovery rate 78.0%~96.6% 90.6% 279,547 Internal model (4) Asset correlations 3.0% 3.0% Discount factor 1.3%~1.6% 1.3% Prepayment rate 18.3% 18.3% Probability of default 0.0%~83.7% — (3) Recovery rate 57.4% 57.4% Other debt securities 313,895 Discounted cash flow Liquidity premium 1.0%~3.2% 2.9% 79,541 Return on equity method Probability of default 0.0%~8.0% 0.4% Recovery rate 60.0%~90.0% 78.8% Market-required return on capital 8.0%~10.0% 10.0% At March 31, 2021 Fair value (1) Valuation technique Significant unobservable inputs Range Median (2) (in millions) Trading derivatives—net: Interest rate contracts—net 12,841 Option model Correlation between interest rates 30.0 %~ 44.8% Correlation between interest rate and foreign exchange rate 15.1 %~ 41.6% Volatility 0.0 %~ 65.0% Foreign exchange 7,283 Option model Correlation between interest rates 10.0 %~ 51.0% Correlation between interest rate and foreign exchange rate 0.0 %~ 38.9% Correlation between foreign exchange rates 50.0 %~ 66.4% Volatility 9.5 %~ 13.7% Equity contracts—net (4,597 ) Option model Correlation between foreign exchange rate and equity (58.4) %~ 26.2% Correlation between equities 15.0 %~ 54.0% Volatility 27.5 %~ 31.8% 5,557 Discounted cash flow Term of litigation 0.0 0.6 year Notes: (1) The fair value as of March 31, 2020 and 2021 excludes the fair value of investments valued using vendor prices. (2) Weighted average is calculated by weighing each input by the relative fair value of the respective financial instruments for investment securities. Median is used for derivative instruments. (3) See “Probability of default” in “Changes in and range of unobservable inputs”. (4) For further detail of Internal model, refer to the last paragraph of “Trading Account Assets and Liabilities—Trading Account Securities”. Changes in and range of unobservable inputs Probability of default The wide range of probability of default used in the internal model of Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities is mainly caused by Asset-backed securities. Asset-backed securities have a large number of underlying loans, mainly corporate loans, in several industries. The MUFG Group primarily makes investments in the senior tranches of such securities, with no investments in the equity portion. Thus, the MUFG Group’s investments have higher priority of payments than mezzanine and equity and even if some of underlying loans become default, the MUFG Group may still be able to receive the full contractual payments. Discount factor and Liquidity premium Recovery rate and Prepayment rate Volatility The level of volatility generally depends on the tenor of the underlying instrument and the strike price or level defined in the contract. Volatilities for certain combinations of tenor and strike price are not observable. The volatility inputs used to estimate fair value of interest rate contracts are distributed throughout the range. Correlation correlation inputs can have a major impact, favorable or unfavorable, on the value of an instrument, depending on its nature. In addition, the wide range of correlation inputs are primarily due to the complex and unique nature of these instruments. There are many different types of correlation inputs, including cross-asset correlation (such as correlation between interest rate and equity), and same-asset correlation (such as correlation between interest rates). Correlation levels are highly dependent on market conditions and could have a relatively wide range of levels within or across asset classes. For interest rate contracts and foreign exchange contracts, the diversity in the portfolio held by the MUFG Group is reflected in wide ranges of correlation, as the fair values of transactions with a variety of currencies and tenors are determined using several foreign exchange and interest rate curves. For equity derivative contracts, the wide range of correlation between interest rate and equity is primarily due to the large number of correlation pairs with different maturities of contracts. For credit derivative contracts, the wide range of correlation between underlying assets is primarily due to factors such as reference assets with different maturities, capital structure subordinations, and credit quality. Term of litigation These swaps are valued using a discounted cash flow methodology and are dependent upon the final resolution of the Covered Litigation. The settlement timing of the Covered Litigation is not observable in the market, therefore the estimated term is classified as a level 3 input. The restricted shares which the MUFG Group purchased will be convertible to listed shares of the issuer at the end of the Covered Litigation. The restricted shares will be diluted dependent upon the settlement amount of the Covered Litigation and the dilution of the restricted shares is accomplished through an adjustment to the conversion rate of the restricted shares. In order to hedge the reduction of the conversion rate, the MUFG Group entered into certain swaps with the seller which references the conversion rate. The value generated by these trades is subject to the ultimate term of the issuer’s litigation, subject to a minimum term referenced within the trade contracts. Market-required return on capital Loan Price 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, write-downs of individual assets or the measurement alternative for nonmarketable equity securities. 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, 2020 and 2021: 2020 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Lev

Parent Company Only Financial I

Parent Company Only Financial Information [Text Block]	12 Months Ended
	Mar. 31, 2021
Condensed Financial Information Disclosure [Abstract]
Parent Company Only Financial Information [Text Block]	32. PARENT COMPANY ONLY FINANCIAL INFORMATION Distributions of retained earnings of MUFG Bank and Mitsubishi UFJ Trust and Banking are restricted in order to meet the minimum capital adequacy requirements under the Banking Law. Additionally, retained earnings of these banking subsidiaries are restricted, except for approximately ¥5,247 billion and ¥5,155 billion, in accordance with the statutory reserve requirements under the Companies Act at March 31, 2020 and 2021, respectively. See Notes 19 and 21 for further information. The Banking Law and related regulations restrict the ability of these banking subsidiaries to extend loans or credit to the parent company. Such loans or credits to the parent company are generally limited to 15% of the banking subsidiary’s consolidated total capital, as determined by the capital adequacy guidelines. At March 31, 2020 and 2021, approximately ¥5,696 billion and ¥6,007 billion, respectively, of net assets of consolidated subsidiaries may be restricted as to payment of cash dividends and loans to the parent company. The following table presents the parent company only financial information of MUFG: Condensed Balance Sheets As of March 31, 2020 2021 (in millions) Assets: Cash and interest-earning deposits with banking subsidiaries ¥ 185,668 ¥ 229,380 Investments in subsidiaries and affiliated companies 16,116,568 16,658,522 Banking subsidiaries 12,361,190 12,793,367 Non-banking 3,755,378 3,865,155 Loans to subsidiaries 8,746,231 9,208,439 Banking subsidiaries 8,222,278 8,690,696 Non-banking 523,953 517,743 Other assets 241,441 197,231 Total assets ¥ 25,289,908 ¥ 26,293,572 Liabilities and Shareholders’ equity: Short-term borrowings from banking subsidiaries ¥ 1,255,991 ¥ 1,206,694 Long-term debt from non-banking 30,686 15,897 Long-term debt 8,758,646 9,226,046 Other liabilities 228,098 183,986 Total liabilities 10,273,421 10,632,623 Total shareholders’ equity 15,016,487 15,660,949 Total liabilities and shareholders’ equity ¥ 25,289,908 ¥ 26,293,572 Condensed Statements of Income Fiscal years ended March 31, 2019 2020 2021 (in millions) Income: Dividends from subsidiaries and affiliated companies ¥ 306,879 ¥ 376,376 ¥ 404,064 Banking subsidiaries 207,161 277,472 317,453 Non-banking 99,718 98,904 86,611 Management fees from subsidiaries 28,305 33,543 35,095 Interest income from subsidiaries 127,117 174,500 174,816 Foreign exchange gains (losses)—net (20,598 ) 4,834 1,089 Trading account losses—net (8,078 ) (37,272 ) (18,285 ) Gains on sales of investment in subsidiaries and affiliated companies—net 252,253 67,406 95 Other income 3,199 14,968 12,552 Total income 689,077 634,355 609,426 Expense: Operating expenses 28,168 30,431 37,567 Interest expense to subsidiaries and affiliated companies 34,594 26,244 11,415 Interest expense 108,756 155,774 159,057 Other expense 1,657 15,024 8,164 Total expens e 173,175 227,473 216,203 Equity in undistributed net income (loss) of subsidiaries and affiliated companies—net 194,390 (108,069 ) 727,257 Income before income tax expense (benefit) 710,292 298,813 1,120,480 Income tax expense (benefit) (8,353 ) (7,142 ) 3,182 Net income ¥ 718,645 ¥ 305,955 ¥ 1,117,298 Condensed Statements of Cash Flows Fiscal years ended March 31, 2019 2020 2021 (in millions) Operating activities: Net income ¥ 718,645 ¥ 305,955 ¥ 1,117,298 Adjustments and other (351,775 ) (1,704 ) (568,317 ) Net cash provided by operating activities 366,870 304,251 548,981 Investing activities: Proceeds from redemption of other investment securities — 240,000 — Proceeds from sales of investment in subsidiaries and affiliated companies 455,605 135,581 35,081 Purchase of equity investment in subsidiaries and an affiliated company (18,346 ) — — Net increase in loans to subsidiaries (2,112,711 ) (1,547,178 ) (462,208 ) Other—ne t (9,009 ) (12,572 ) (11,531 ) Net cash used in investing activities (1,684,461 ) (1,184,169 ) (438,658 ) Financing activities: Net decrease in short-term borrowings from subsidiaries (194,300 ) (164,272 ) (49,058 ) Proceeds from issuance of long-term debt 2,043,677 1,844,488 831,121 Repayment of long-term debt (314 ) (214,994 ) (514,436 ) Repayment of long-term debt to affiliated companies (500 ) (241,000 ) (10,500 ) Proceeds from sales of treasury stock 3 2 1 Payments for acquisition of treasury stock (150,277 ) (50,022 ) (13 ) Dividends paid (276,279 ) (304,538 ) (321,772 ) Other—net (15,490 ) (7,791 ) (1,954 ) Net cash provided by (used in) financing activities 1,406,520 861,873 (66,611 ) Net increase (decrease) in cash and cash equivalents 88,929 (18,045 ) 43,712 Cash and cash equivalents at beginning of fiscal year 114,784 203,713 185,668 Cash and cash equivalents at end of fiscal year ¥ 203,713 ¥ 185,668 ¥ 229,380

Subsequent Events _Text Block_

Subsequent Events [Text Block]	12 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events [Text Block]	33. SUBSEQUENT EVENTS Approval of Dividends On June 29, 2021, the shareholders approved the payment of cash dividends of ¥12.5 per share of Common stock, totaling ¥160,918 million, that were payable on June 30, 2021, to the shareholders of record on March 31, 2021.

Basis of Financial Statements_2

Basis of Financial Statements and Summary of Significant Accounting Policies [Text Block] (Policies)	12 Months Ended
	Mar. 31, 2021
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 29 for more information by business segment.
Basis of Financial Statements [Policy Text Block]	Basis of Financial Statements The accompanying consolidated financial statements are presented in Japanese yen, the currency of the country in which MUFG is incorporated and principally operates. The accompanying consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States of America (“U.S. GAAP”). In certain respects, the accompanying consolidated financial statements reflect adjustments which are not included in the consolidated financial statements issued by MUFG and certain of its subsidiaries in accordance with applicable statutory requirements and accounting practices in their respective countries of incorporation. The major adjustments include those relating to (1) investment securities, (2) derivative financial instruments, (3) allowance for credit losses, (4) income taxes, (5) consolidation, (6) premises and equipment, (7) transfer of financial assets, (8) accrued severance indemnities and pension liabilities, (9) goodwill and other intangible assets and (10) lease transactions. Fiscal years of certain subsidiaries, which end on December 31, and MUFG’s fiscal year, which ends on March 31, have been treated as coterminous. For the fiscal years ended March 31, 2019, 2020 and 2021, the effect of recording intervening events for the three-month periods ended March 31 on MUFG’s proportionate equity in net income of subsidiaries with fiscal years ended on December 31, would have resulted in an increase of ¥19.97 billion, a decrease of ¥164.48 billion, and an increase of ¥157.32 billion to net income attributable to Mitsubishi UFJ Financial Group, respectively. No intervening events occurred during each of the three-month periods ended March 31, 2019, 2020 and 2021 which, if recorded, would have had material effects on consolidated total assets, loans, total liabilities, deposits or total equity as of March 31, 2019, 2020 and 2021.
Use of Estimates [Policy Text Block]	Use of Estimates The preparation of 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to management judgment primarily relate to the allowance for credit losses, the valuation of deferred tax assets, the valuation of financial instruments, the accounting for goodwill and intangible assets, impairment of investment securities, the allowances for repayment of excess interest and accrued severance indemnities and pension liabilities.
Consolidation [Policy Text Block]	Consolidation investees-net. The MUFG Group consolidates VIEs if it has the power to direct the activities of a VIE which most significantly impact the VIE’s economic performance and has the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. To assess whether a VIE should be consolidated or not, the MUFG Group considers all factors, such as the purpose and design of the VIE, contractual arrangements, and the MUFG Group’s involvement in both the establishment of the VIE and day-to-day Assets that the MUFG Group holds in an agency, fiduciary or trust capacity are not assets of the MUFG Group and, accordingly, are not included in the accompanying consolidated balance sheets.
Cash Flows [Policy Text Block]	Cash Flows
Translation of Foreign Currency Financial Statements and Foreign Currency Transactions [Policy Text Block]	Translation of Foreign Currency Financial Statements and Foreign Currency Transactions year-end Foreign currency translation gains and losses related to the financial statements of overseas entities of the MUFG Group, net of related income tax effects, are credited or charged directly to Foreign currency translation adjustments, a component of Accumulated other comprehensive income (“Accumulated OCI”). Tax effects of gains and losses on foreign currency translation of the financial statements of overseas entities are not recognized unless it is apparent that the temporary differences will reverse in the foreseeable future. Foreign currency-denominated assets and liabilities are translated into the functional currencies of the individual entities included in consolidation at the respective fiscal year-end
Repurchase Agreements, Securities Lending and Other Secured Financing Transactions [Policy Text Block]	Repurchase Agreements, Securities Lending and Other Secured Financing Transactions off-balance off-balance
Collateral [Policy Text Block]	Collateral mark-to-market
Trading Account Securities [Policy Text Block]	Trading Account Securities
Investment Securities [Policy Text Block]	Investment Securities Held-to-maturity Available-for-sale net-of-tax Available-for-sale recovery of its amortized cost basis. If not, the credit component of an impairment loss is recognized in earnings by recording an allowance for credit losses, limited by the amount of impairment loss. However, the noncredit component of an impairment loss is recognized in Accumulated OCI. In determining whether a credit loss exists, the MUFG Group generally considers factors such as the financial condition of the issuer and the extent of decline in fair value. For Held-to-maturity Equity securities include marketable equity investment securities and nonmarketable equity investment securities. Marketable equity investment securities are measured at fair value with unrealized gains or losses reflected in net income. Nonmarketable equity investment securities are primarily measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes. Nonmarketable equity investment securities held by subsidiaries that are investment companies or brokers and dealers, are subject to the specialized industry accounting principles for investment companies and brokers and dealers. Securities of those subsidiaries are carried at their fair values. Interest and dividends on investment securities are reported in Interest income. Dividends are recognized when the shareholder right to receive the dividend is established. Gains and losses on disposition of investment securities are computed using the average cost method and are recognized on the trade date.
Derivative Financial Instruments [Policy Text Block]	Derivative Financial Instruments Derivatives entered into for trading purposes are carried at fair value and are reported as Trading account assets or Trading account liabilities, as appropriate. The fair values of derivative contracts executed with the same counterparty under legally enforceable master netting agreements are presented on a gross basis. Changes in the fair value of such contracts are recognized currently in Foreign exchange gains (losses)—net with respect to foreign exchange contracts and in Trading account profits (losses)—net with respect to interest rate contracts and other types of contracts. Embedded features that are not clearly and closely related to the host contracts and meet the definition of derivatives are separated from the host contracts and measured at fair value unless the contracts embedding the derivatives are measured at fair value in their entirety. Derivatives are also used to manage exposures to fluctuations in interest and foreign exchange rates arising from mismatches of asset and liability positions. Certain of those derivatives are designated as hedging instruments and qualify for hedge accounting. The MUFG Group designates a derivative as a hedging instrument at the inception of each such hedge relationship, and it documents, for such individual hedging relationships, the risk management objective and strategy, including the item being hedged, the specific risk being hedged and the method used to assess the hedge effectiveness. In order for a hedging relationship to qualify for hedge accounting, the changes in the fair value of the derivative instruments must be highly effective in achieving offsetting changes in fair values or variable cash flows of the hedged items attributable to the risk being hedged. All qualifying hedging derivatives are valued at fair value and included in Other assets or Other liabilities, as appropriate. For fair value hedges, the changes in the fair value of a hedging instrument are recognized in the same income statement line as the hedged item. For cash flow hedges, the changes in the fair value of a hedging instrument are recognized in Accumulated OCI. Amounts realized on cash flow hedges related to variable rate loans are recognized in Net interest income in the period when the cash flow from the hedged item is realized. Any difference that arises from gains or losses on hedging derivatives offsetting corresponding gains or losses on the hedged items, and gains and losses on derivatives attributable to the risks excluded from the assessment of hedge effectiveness are recognized in earnings.
Loans [Policy Text Block]	Loans held-for-sale The MUFG Group classifies its loan portfolio into the following portfolio segments—Commercial, Residential, Card, MUFG Americas Holdings Corporation (“MUFG Americas Holdings” or “MUAH”), Bank of Ayudhya Public Company Limited (“Krungsri”), and Other 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. Past due status is determined based on the contractual terms of the loan and the actual number of days since the date the last payment was made. Originated loans are generally placed on nonaccrual status when substantial doubt exists as to the full and timely collection of either principal or interest, specifically 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. A nonaccrual loan may be restored to an accrual status when interest and principal payments become current and management expects that the borrower will make future contractual payments as scheduled. When a loan is placed on nonaccrual status, interest accrued but not received is generally reversed against interest income. Cash receipts on nonaccrual loans, for which the ultimate collectibility of principal is uncertain, are applied as principal reductions; otherwise, such collections are credited to income. The MUFG Group modifies certain loans in conjunction with its loss-mitigation activities. Through these modifications, concessions are granted to a borrower who is experiencing financial difficulty, generally in order to minimize economic loss, to avoid foreclosure or repossession of collateral, and to ultimately maximize payments received from the borrower. The concessions granted vary by portfolio segment, by program, and by borrower-specific characteristics, and may include interest rate reductions, term extensions, payment deferrals, and partial principal forgiveness. Loan modifications that represent concessions made to borrowers who are experiencing financial difficulties are identified as troubled debt restructurings (“TDRs”). Generally, accruing loans that are modified in a TDR remain as accruing loans subsequent to the modification, and nonaccrual loans remain as nonaccrual. However, if a nonaccrual loan has been modified as a TDR, the borrower is not delinquent under the modified terms, and demonstrates that its financial condition has improved, the MUFG Group may reclassify the loan to accrual status. This determination is generally performed at least once a year through a detailed internal credit rating review process. Once a nonaccrual loan is deemed to be a TDR, the MUFG Group will continue to designate the loan as a TDR even if the loan is reclassified to accrual status.
Loan Securitization [Policy Text Block]	Loan Securitization
Allowance for Credit Losses (Loans) [Policy Text Block]	Allowance for Credit Losses (Loans) Actual credit losses (amounts deemed uncollectible, in whole or in part), net of recoveries, are generally determined based on detailed loan reviews and a credit assessment by management at each balance sheet date and are deducted from the allowance for credit losses as net charge-offs. The MUFG Group generally applies its charge-off Key elements relating to the policies and discipline used in determining the allowance for credit losses are credit classification and the related borrower categorization process. The categorization is based on conditions that may affect the ability of borrowers to service their debt, taking into consideration current financial information, historical payment experience, credit documentation, public information, analyses of relevant industry segments or existing economic conditions. In determining the appropriate level of the allowance, the MUFG Group evaluates the probable loss by collateral value, historical loss experience, probability of insolvency and category of loan based on its type and characteristics. The methodologies used to estimate the allowance and the charge-off Commercial segment procedures, the industry in which a borrower operates, and changes in other external factors. The collectively-assessed allowance methodology incorporates an economic forecast over a three-year period. Beyond the three-year economic forecast, the allowance methodology reverts to an average historical loss information on a straight-line basis over a two-year The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis. For nonaccrual TDRs, the allowance for credit losses is provided for these loans using the discounted cash flow method, or based on the fair value of the collateral. For TDRs accounted for as accruing loans, the allowance for credit losses is determined by discounting the estimated future cash flows using the original effective interest rate of the loans prior to modification. In relation to loans categorized as Legally/Virtually Bankrupt, the carrying amount of loans less estimated value of the collateral and guaranteed amount is generally considered uncollectible, and is charged off. Residential segment In the Residential segment, the loans are comprised of smaller-balance homogeneous loans and expected credit losses of loans are measured on a collective basis. The allowance for credit losses is measured over the contractual term of the loans that is adjusted for expected prepayments, using the state transition probability matrix, which captures delinquency status changes and prepayments by loans’ remaining term, and is based on historical information and adjusted to incorporate expectations of future economic conditions considering economic variables, such as unemployment rates. The LGD is also used to capture the estimated loss on the loan that would be realized upon the default of the borrower. The allowance methodology incorporates an economic forecast over a period. Beyond the three-year economic forecast, the allowance methodology reverts to average historical loss information on a straight-line basis over a two-year period. The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis. For nonaccrual TDRs, the allowance for credit losses is provided for these loans using the discounted cash flow method, or based on the fair value of the collateral. For TDRs accounted for as accruing loans, the allowance for credit losses is determined by discounting the estimated future cash flows using the original effective interest rate of the loans prior to modification. In relation to loans that are in past due status over a certain period of time and deemed uncollectible, the carrying amount of loans less estimated value of the collateral and guaranteed amount is generally considered uncollectible and charged off. Card segment In the Card segment, the loans are smaller-balance homogeneous loans and expected credit losses of loans are measured on a collective basis. The allowance for credit losses is measured over the contractual term of the loans that is adjusted for expected prepayments, using the state transition probability matrix, which captures delinquency status changes and prepayments by loans’ remaining term, and is based on historical information and adjusted to incorporate expectations of future economic conditions considering economic variables, such as unemployment rate. The collectively-assessed allowance methodology incorporates an economic forecast over a three-year period. Beyond the three-year economic forecast, the allowance methodology reverts to average historical loss information. The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis, and the allowance for credit losses is determined using the discounted cash flow method whereby the estimated future cash flows are discounted using the original effective interest rate of the loans prior to modification. In relation to loans that are in past due status over a certain period of time and deemed uncollectible, the amount of loans is generally fully charged off. MUFG Americas Holdings segment In the MUFG Americas Holdings segment, expected credit losses are measured on a collective basis when similar risk characteristics exist. The allowance for credit loss is calculated as the product of PD, LGD, and EAD modeled parameters that are projected on a monthly basis over the assets’ remaining contractual lives. The sum of each month’s expected loss calculation results in the collectively-assessed allowance estimate. Expected loss models use historical loss information and a variety of economic assumptions that consider economic variables such as gross domestic product and unemployment rates, to estimate PD, LGD, and EAD. These models are tailored to different loan segments, classes and products by changing the economic variables or their weighting in the calculation used to estimate expected losses. The collectively-assessed allowance methodology incorporates an economic forecast over a two-year period. Beyond the two-year economic forecast, the allowance methodology reverts to average historical loss information on a straight-line basis over two-year period. Loans that do not share risk characteristics are evaluated individually to determine the allowance balance. Individually-assessed allowance is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, or the fair value of the collateral if the loan is collateral dependent. Management implements qualitative adjustments to the collectively-assessed allowance to account for the risks not incorporated in the model between current conditions and those reflected in the historical loss information used to estimate the models. These qualitative factors include changes in credit policies, problem loan trends, identification of new risks not incorporated into the modeling framework, credit concentrations, changes in lending management and other external factors. Qualitative adjustments are also used to adjust the collectively-assessed allowance to account for risks attributed to imprecision in the economic forecast and when risks emerge that impact specific portfolio components (i.e., natural disasters). The allocated allowance for large groups of smaller-balance homogeneous loans is established for consumer loans as well as for smaller balance commercial loans. These loans are managed on a pool basis, and loss factors are based on expected net charge-off The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured either individually or in pools with similar risk characteristics. The allowance for individually assessed TDR loans can be measured using a discounted cash flow methodology, or by evaluating the fair value of the collateral, if collateral dependent. When the value of a concession cannot be measured using a method other than the discounted cash flow method, the value of a concession is measured by discounting the expected future cash flows at the original interest rate of the loan. Commercial loans are generally considered uncollectible based on an evaluation of the financial condition of a borrower as well as the value of any collateral and, when considered to be uncollectible, loans are charged off in whole or in part. Consumer loans are generally considered uncollectible based on past due status and the value of any collateral and, when considered to be uncollectible, loans are charged off in whole or in part. Krungsri segment In the Krungsri segment, expected credit losses are measured on a collective basis for portfolios of loans that share similar economic risk characteristics. Expected credit losses are a probability-weighted estimate of the present value of credit losses. These are measured as the present value of the difference between the cash flows under the contract and the cash flows expected to be received arising from the weighting of multiple future economic scenarios that consider economic variables such as gross domestic product and unemployment rates, discounted at the loan’s effective interest rate. Qualitative adjustments are made when considered appropriate. Loans that do not share risk characteristics are evaluated individually to determine the allowance balance. Individually-assessed allowance is measured based on the present value of expected future cash flows discounted at the loan’s original effective interest rate, or the fair value of the collateral if the loan is collateral dependent. The allocated allowance for large groups of smaller-balance homogeneous loans is established for smaller balance loans such as housing loans, credit card loans, and personal loans. These loans are managed on a pool basis, and loss factors are based on expected net charge-off The allowance for loans that have been modified into a TDR or reasonably expected to be modified TDR are measured on an individual basis. For nonaccrual TDRs, the allowance for credit losses is provided for these loans using the discounted cash flow method, or based on the fair value of the collateral. For TDRs accounted for as accruing loans, the allowance for credit losses is determined by using the discounted cash flow method whereby the estimated future cash flows are discounted using the original effective interest rate of the loans prior to modification. Loans to customers are charged off when they are determined to be uncollectible considering the financial condition of a borrower. In all segments, when estimating the allowance for credit losses, significant management assumptions are incorporated in economic variables, qualitative adjustments, or both to capture the heightened volatility and uncertainty in the economy due to the COVID-19 There are de minimis or zero expected credit losses, for example, for lending and financing transactions, such as Interest-earning deposits in other banks, Call loans and funds sold, Receivables under resale agreements and Receivables under securities borrowing transactions because the term is short and the credit quality of the borrowers is normal.
Allowance for Off-balance Sheet Credit Instruments [Policy Text Block]	Allowance for Off-Balance off-balance
Premises and Equipment [Policy Text Block]	Premises and Equipment Years Buildings 15 to 50 Equipment and furniture 2 to 20 Leasehold improvements 2 to 39 Maintenance, repairs and minor improvements are charged to operations as incurred. Major improvements are capitalized. Net gains or losses on dispositions of premises and equipment are included in Other non-interest Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of an asset to be held and used is measured by a comparison of the carrying amount to future undiscounted net cash flows expected to be generated by the asset. If an asset is considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the asset exceeds the fair value. For purposes of recognition and measurement of an impairment loss, a long-lived asset or assets are grouped with other assets and liabilities at the lowest level with independent and identifiable cash flows. Assets to be disposed of by sale are reported at the lower of the carrying amount or fair value less estimated cost to sell. Asset retirement obligations related to restoration of certain leased properties upon lease termination are recorded in Other liabilities with a corresponding increase in leasehold improvements. The amounts represent the present value of expected future cash flows associated with returning such leased properties to their original condition. The difference between the gross and present value of expected future cash flows is accreted over the life of the related leases as a non-interest
Goodwill [Policy Text Block]	Goodwill Goodwill arising from a business combination is not amortized but is tested at least annually for impairment. Goodwill is recorded at a designated reporting unit level for the purpose of assessing impairment. A reporting unit is an operating segment, or an identified business unit one level below an operating segment. An impairment loss is recognized to the extent that the carrying amount of a reporting unit exceeds its fair value, but not exceeding the total amount of goodwill allocated to that reporting unit.
Intangible Assets [Policy Text Block]	Intangible assets Useful lives Amortization method Software 3 to 10 Straight-line Core deposit intangibles 9 to 16 Straight-line Customer relationships 3 to 27 Straight-line, Declining-balance Trade names 4 to 40 Straight-line Intangible assets having indefinite useful lives are not amortized but are subject to annual impairment tests. An impairment exists if the carrying value of an indefinite-lived intangible asset exceeds its fair value. For other intangible assets subject to amortization, an impairment is recognized if the carrying amount is not recoverable and the carrying amount exceeds the fair value of the intangible asset. The MUFG Group capitalizes certain costs associated with the acquisition or development of internal-use internal-use
Accrued Severance and Pension Liabilities [Policy Text Block]	Accrued Severance and Pension Liabilities non-interest
Long-term Debt [Policy Text Block]	Long-Term Debt
Obligations under Guarantees [Policy Text Block]	Obligations under Guarantees
Allowance for Repayment of Excess Interest [Policy Text Block]	Allowance for Repayment of Excess Interest recent trend of borrowers’ claims for reimbursement, and management’s future forecasts. The allowance is recorded as a liability in Other liabilities.
Fees and Commissions [Policy Text Block]	Fees and Commissions The following is an explanation of the MUFG Group’s key revenue from contracts with customers and the timing of its recognition. 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 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 services is satisfied and the fees and commissions are recognized over the course of each month. Fees and commissions on remittances and transfers consist of fees and commissions charged for settlement transactions such as domestic fund remittances, including electronic banking transactions, 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. 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. Fees and commissions on credit card business consist of fees and commissions 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. 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. 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. 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. 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. 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. 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
Income Taxes [Policy Text Block]	Income Taxes The MUFG Group records net deferred tax assets to the extent these assets will more likely than not be realized. In making such determination, all available positive and negative evidence is considered, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations. In the event the MUFG Group were to determine that it would be able to realize deferred tax assets in the future in excess of their net recorded amount, the MUFG Group would make an adjustment to the valuation allowance, which would reduce the provision for income taxes. Uncertain tax positions are recorded on the basis of a two-step those tax positions that meet the more-likely-than-not
Free Distributions of Common Shares [Policy Text Block]	Free Distributions of Common Shares
Earnings Per Common Share [Policy Text Block]	Earnings per Common Share
Treasury Stock [Policy Text Block]	Treasury Stock
Comprehensive Income [Policy Text Block]	Comprehensive Income
Stock-Based Compensation [Policy Text Block]	Stock-Based Compensation year-end
Accounting Changes [Policy Text Block]	Accounting Changes Disclosure Framework Changes to the Disclosure Requirements for Fair Value Measurement requirements on fair value measurements. This guidance removes disclosure requirements for the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and valuation processes for Level 3 fair value measurements. In addition, the guidance modifies disclosure requirements for investments in certain entities that calculate net asset value and modifies disclosure requirements related to measurement uncertainty. Lastly, the guidance adds disclosure requirements for changes in unrealized gains and losses for the period that are included in OCI for recurring Level 3 fair value measurements held at the end of the reporting period, and the guidance adds disclosure requirements related to the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted upon issuance of this guidance. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this guidance and delay adoption of the additional disclosures until their effective date. The MUFG Group early adopted removal disclosure requirements as of March 31, 2019, and then adopted other requirements of this guidance on April 1, 2020. The guidance affected disclosures in the notes to the consolidated financial statements and did not affect its financial position and results of operations. Measurement of Credit Losses on Financial Instruments available-for-sale In April 2019 and November 2019, the FASB issued additional guidance to improve certain aspects of this guidance. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The MUFG Group adopted the guidance on April 1, 2020. Upon adoption, the MUFG Group resulted in an increase in the beginning balance of the allowance for credit losses and the allowance for off-balance Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract internal-use internal-use apply the existing impairment guidance on internal-use capitalized-implementation-cost-related Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans Reference Rate Reform

Basis of Financial Statements_3

Basis of Financial Statements and Summary of Significant Accounting Policies [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Estimated Useful Lives of Premises and Equipment [Table Text Block]	Years Buildings 15 to 50 Equipment and furniture 2 to 20 Leasehold improvements 2 to 39
Useful Lives of Intangible Assets and Amortization Method by Major Class [Table Text Block]	Useful lives Amortization method Software 3 to 10 Straight-line Core deposit intangibles 9 to 16 Straight-line Customer relationships 3 to 27 Straight-line, Declining-balance Trade names 4 to 40 Straight-line

Business Developments _Text B_2

Business Developments [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member]
Business Developments [Line Items]
Estimated Fair Values of Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed of Danamon and its subsidiaries as of the acquisition date: (in millions) Loans ¥ 1,086,638 Intangible assets (1) 146,899 Total assets 1,728,480 Deposits—Total deposits 915,075 Total liabilities 1,242,115 Note: (1) Intangible assets with a weighted average amortization period of 13.2 years primarily include ¥79,552 million of relationships with agents with a weighted average amortization period of 13.1 years and ¥44,140 million of core deposit intangibles with a weighted average amortization period of 10.1 years.
MUFG Bank's Acquisition of DVB Bank SE's Aviation Finance Division [Member]
Business Developments [Line Items]
Pro Forma Statements of Income (Unaudited) [Table Text Block]	The following table summarizes the estimated fair values of the assets acquired and liabilities as of the acquisition date: (in millions) Loans ¥ 515,933 Total assets 522,797 Total liabilities 138

Investment Securities _Text B_2

Investment Securities [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Investment Securities [Table Text Block]	At March 31, 2020: Amortized Gross Gross Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 23,308,538 ¥ 185,302 ¥ 30,961 ¥ 23,462,879 Japanese prefectural and municipal bonds 2,938,743 16,279 2,202 2,952,820 Foreign government and official institution bonds 2,936,110 107,406 6,028 3,037,488 Corporate bonds 1,261,586 12,445 1,205 1,272,826 Residential mortgage-backed securities 1,460,641 3,083 4,331 1,459,393 Commercial mortgage-backed securities 379,234 6,110 3,089 382,255 Asset-backed securities 1,461,083 9,516 1,123 1,469,476 Other debt securities (1) 161,832 3,190 1,956 163,066 Total ¥ 33,907,767 ¥ 343,331 ¥ 50,895 ¥ 34,200,203 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,574 ¥ 29,856 ¥ — ¥ 1,130,430 Foreign government and official institution bonds 151,555 243 689 151,109 Residential mortgage-backed securities 737,242 10,478 3,012 (2) 744,708 Commercial mortgage-backed securities 146,039 2,993 317 (2) 148,715 Asset-backed securities 2,030,371 277 27,716 2,002,932 Total ¥ 4,165,781 ¥ 43,847 ¥ 31,734 ¥ 4,177,894 Notes: (1) Other debt securities in the table above mainly include ¥86,734 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 At March 31, 2021: Amortized Gross Gross Fair value (in millions) Available-for-sale Japanese national government and Japanese government agency bonds ¥ 35,166,245 ¥ 147,844 ¥ 40,878 ¥ 35,273,211 Japanese prefectural and municipal bonds 3,719,205 15,123 2,815 3,731,513 Foreign government and official institution bonds 2,854,037 84,707 11,781 2,926,963 Corporate bonds 1,123,271 11,400 401 1,134,270 Residential mortgage-backed securities 1,459,062 9,119 1,051 1,467,130 Commercial mortgage-backed securities 435,975 29,502 912 464,565 Asset-backed securities 1,373,450 11,685 650 1,384,485 Other debt securities 168,528 3,780 730 171,578 Commercial paper 564,072 31 5 564,098 Total ¥ 46,863,845 ¥ 313,191 ¥ 59,223 ¥ 47,117,813 Held-to-maturity Japanese national government and Japanese government agency bonds ¥ 1,100,447 ¥ 23,033 ¥ — ¥ 1,123,480 Foreign government and official institution bonds 233,883 2,262 2,795 233,350 Residential mortgage-backed securities 411,024 18,590 — (1) 429,614 Commercial mortgage-backed securities 111,750 4,846 — (1) 116,596 Asset-backed securities 2,046,659 1,721 12,277 2,036,103 Total ¥ 3,903,763 ¥ 50,452 ¥ 15,072 ¥ 3,939,143 Note: (1) 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 Available-for-sale Amortized Fair value Fair value (in millions) Due in one year or less ¥ 14,562 ¥ 14,572 ¥ 24,815,321 Due from one year to five years 1,179,959 1,205,257 8,129,683 Due from five years to ten years 826,833 827,481 8,549,713 Due after ten years 1,882,409 1,891,833 5,623,096 Total ¥ 3,903,763 ¥ 3,939,143 ¥ 47,117,813
Investments by Length and Category in Continuous Loss Position [Table Text Block]	Less than 12 months 12 months or more Total At March 31, 2020: 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 ¥ 11,781,600 ¥ 30,961 ¥ — ¥ — ¥ 11,781,600 ¥ 30,961 202 Japanese prefectural and municipal bonds 935,540 2,202 — — 935,540 2,202 340 Foreign government and official institution bonds 564,620 5,481 114,407 547 679,027 6,028 153 Corporate bonds 522,941 1,191 25,228 14 548,169 1,205 154 Residential mortgage-backed securities 114,057 530 388,064 3,801 502,121 4,331 402 Commercial mortgage-backed securities 182,887 3,087 1,304 2 184,191 3,089 39 Asset-backed securities 189,775 503 86,605 620 276,380 1,123 94 Other debt securities 53,070 132 30,657 1,824 83,727 1,956 24 Total ¥ 14,344,490 ¥ 44,087 ¥ 646,265 ¥ 6,808 ¥ 14,990,755 ¥ 50,895 1,408 Held-to-maturity Foreign government and official institution bonds ¥ 55,746 ¥ 689 ¥ — ¥ — ¥ 55,746 ¥ 689 9 Residential mortgage-backed securities 108,478 1,033 360,841 1,979 469,319 3,012 281 Commercial mortgage-backed securities 10,281 32 133,791 285 144,072 317 31 Asset-backed securities 637,201 8,536 1,259,720 19,180 1,896,921 27,716 77 Total ¥ 811,706 ¥ 10,290 ¥ 1,754,352 ¥ 21,444 ¥ 2,566,058 ¥ 31,734 398 Less than 12 months 12 months or more Total At March 31, 2021: 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 ¥ 12,098,437 ¥ 31,055 ¥ 429,235 ¥ 9,823 ¥ 12,527,672 ¥ 40,878 286 Japanese prefectural and municipal bonds 870,007 1,584 276,172 1,231 1,146,179 2,815 405 Foreign government and official institution bonds 429,204 11,768 50,478 13 479,682 11,781 71 Corporate bonds 96,582 166 229,518 235 326,100 401 120 Residential mortgage-backed securities 378,351 577 139,214 474 517,565 1,051 218 Commercial mortgage-backed securities 36,633 905 2,616 7 39,249 912 21 Asset-backed securities 190,795 394 49,428 256 240,223 650 89 Other debt securities 22,812 91 22,388 639 45,200 730 17 Commercial paper 116,016 5 — — 116,016 5 8 Total ¥ 14,238,837 ¥ 46,545 ¥ 1,199,049 ¥ 12,678 ¥ 15,437,886 ¥ 59,223 1,235
Carrying Value of Nonmarketable Equity Securities [Table Text Block]	2020 2021 (in millions) Measurement alternative balance ¥ 534,882 ¥ 356,074
Related Adjustments for Nonmarketable Equity Securities [Table Text Block]	Fiscal years ended 2019 2020 2021 (in millions) Measurement alternative impairment losses (1)(4) ¥ (2,292 ) ¥ (3,099 ) ¥ (5,188 ) Measurement alternative downward changes for observable prices (1)(2)(3)(5) ¥ — ¥ (953 ) ¥ — Measurement alternative upward changes for observable prices (1)(2)(3)(6) ¥ 53,077 ¥ 6,223 ¥ 21,710 Notes: (1) Included in Investment securities gains (losses)—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. (3) The MUFG Group applied measurement alternative downward or upward changes to certain nonmarketable equity securities, resulting from observable prices in orderly transactions, such as partial repurchase and transactions by other entities. (4) The cumulative impairment losses at March 31, 2020 and 2021 were ¥5,007 million and ¥10,102 million, respectively. (5) The cumulative downward changes for observable prices at March 31, 2020 and 2021 were ¥953 million and ¥953 million, respectively. (6) The cumulative upward changes for observable prices at March 31, 2020 and 2021 were ¥34,466 million and ¥54,806 million, respectively.
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]	Fiscal years ended 2019 2020 2021 (in millions) Net gains (losses) recognized during the period (1) ¥ (278,746 ) ¥ (639,813 ) ¥ 1,467,763 Less: Net gains (losses) recognized during the period on equity securities sold during the period (3,303 ) (37,541 ) 47,775 Net unrealized gains (losses) recognized during the reporting period still held at the reporting date ¥ (275,443 ) ¥ (602,272 ) ¥ 1,419,988 Note: (1) Included in Investment securities gains (losses)—net.

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Loans by Domicile and Industry of Borrower Segment Classification [Table Text Block]	2020 2021 (in millions) Domestic: Manufacturing ¥ 11,448,778 ¥ 13,133,360 Construction 733,212 763,958 Real estate 12,054,671 11,997,301 Services 2,585,111 2,908,975 Wholesale and retail 7,504,561 7,766,070 Banks and other financial institutions (1) 5,161,093 6,443,296 Communication and information services 1,572,344 1,407,738 Other industries 8,673,871 8,838,718 Consumer 15,319,721 15,066,986 Total domestic 65,053,362 68,326,402 Foreign: Governments and official institutions 726,347 655,367 Banks and other financial institutions (1) 11,788,225 10,649,029 Commercial and industrial 32,565,030 29,574,176 Other 8,404,062 6,822,771 Total foreign 53,483,664 47,701,343 Unearned income, unamortized premiums—net and deferred loan fees—net (350,287 ) (308,882 ) Total (2) ¥ 118,186,739 ¥ 115,718,863 Notes: (1) Loans to so-called “non-bank Non-bank (2) The above table includes loans held for sale of ¥344,790 million and ¥353,095 million at March 31, 2020 and 2021, respectively.
Nonaccrual Loans by Class [Table Text Block]	March 31, 2020: Nonaccrual (1) (in millions) Commercial Domestic ¥ 312,972 Foreign 127,001 Residential 63,998 Card 61,172 MUAH 35,840 Krungsri 149,732 Other 27,754 Total ¥ 778,469 Recorded Loan Balance March 31, 2021: Nonaccrual (1) Nonaccrual Loans (2) Recognized (in millions) Commercial Domestic ¥565,671 ¥ 111,141 ¥ 4,355 Foreign 258,391 96,833 5,110 Residential 67,968 4,720 923 Card 60,200 — 37 MUAH 73,706 30,242 1,057 Krungsri 161,338 3,042 5,562 Other 26,567 29 4,203 Total ¥ 1,213,841 ¥ 246,007 ¥ 21,247 Notes: (1) Nonaccrual loans in the above table do not include loans held for sale of ¥330 million and ¥8,562 million at March 31, 2020 and 2021, respectively, and do not include loans acquired with deteriorated credit quality of ¥25,427 million at March 31, 2020. (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, or the fair value of the collateral if the loan is a collateral-dependent loan.
Impaired Loans by Class [Table Text Block]	Recorded Loan Balance At March 31, 2020: Requiring Not Requiring (1) Total Unpaid Related (in millions) Commercial Domestic ¥ 598,737 ¥ 147,890 ¥ 746,627 ¥ 784,298 ¥ 268,070 Foreign 141,897 56,464 198,361 220,283 96,009 Loans acquired with deteriorated credit quality 12,906 — 12,906 19,947 4,767 Residential (3) 88,075 4,822 92,897 107,629 12,770 Card (3) 65,240 280 65,520 72,714 19,799 MUAH (3) 33,884 33,835 67,719 84,737 5,977 Krungsri (3) 68,126 30,833 98,959 106,265 30,198 Other (3) 22,749 1,091 23,840 26,091 6,152 Total (2) ¥ 1,031,614 ¥ 275,215 ¥ 1,306,829 ¥ 1,421,964 ¥ 443,742 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) In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥330 million at March 31, 2020. (3) Impaired Loans for Residential, Card, MUAH, Krungsri and Other segments in the above table include loans acquired with deteriorated credit quality.
Average Recorded Loan Balance and Recognized Interest Income on Impaired Loans by Class [Table Text Block]	2019 2020 Average Recognized Average Recognized (in millions) Commercial Domestic ¥ 766,847 ¥ 12,383 ¥ 726,794 ¥ 8,722 Foreign 159,999 3,127 174,831 3,013 Loans acquired with deteriorated credit quality 7,814 182 9,395 74 Residential 107,165 1,620 98,238 1,252 Card 66,187 1,614 65,270 1,241 MUAH 71,162 2,292 82,832 2,801 Krungsri 83,165 4,995 91,577 5,274 Other — — 11,854 494 Total ¥ 1,262,339 ¥ 26,213 ¥ 1,260,791 ¥ 22,871
TDRs by Class [Table Text Block]	2019 2020 2021 Troubled Debt Restructurings Pre- Post- Pre- Post- Pre- Post- (in millions) Commercial (1)(3) Domestic ¥ 36,693 ¥ 36,693 ¥ 61,735 ¥ 61,735 ¥ 39,282 ¥ 39,282 Foreign 5,692 5,692 39,827 39,827 33,839 33,839 Loans acquired with deteriorated credit quality 50 50 10,786 10,786 — — Residential (1)(3) 7,379 7,379 5,137 5,137 18,121 18,121 Card (2)(3) 19,685 18,837 22,625 21,561 20,857 19,737 MUAH (2)(3) 19,837 19,837 33,782 33,564 22,801 22,763 Krungsri (2)(3) 24,392 24,330 31,238 31,209 18,548 18,548 Other (2)(3) — — 12,781 12,780 24,968 24,956 Total ¥ 113,728 ¥ 112,818 ¥ 217,911 ¥ 216,599 ¥ 178,416 ¥ 177,246 2019 2020 2021 Troubled Debt Restructurings Recorded Investment (in millions) Commercial (1)(3) Domestic ¥ 11,002 ¥ 8,857 ¥ 16,179 Foreign — 2,337 9,861 Residential (1)(3) 362 31 157 Card (2)(3) 3,442 3,320 2,733 MUAH (2)(3) 349 4,656 3,437 Krungsri (2)(3) 7,926 7,305 6,226 Other (2)(3) — 15 857 Total ¥ 23,081 ¥ 26,521 ¥ 39,450 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, Krungsri and Other segments include accrual and nonaccrual loans. (3) For the fiscal year ended March 31, 2019, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment and forbearance was the primary concession type in the MUFG Americas Holdings segment. For the fiscal year ended March 31, 2020, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUFG Americas Holdings and Krungsri segments and reduction in the stated rate was the primary concession type in the Card and Other segments. For the fiscal year ended March 31, 2021, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment and forbearance was the primary concession type in the MUFG Americas Holdings segment.
Credit Quality Indicators of Loans by Class [Table Text Block]	At March 31, 2020: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 49,695,889 ¥ 1,186,044 ¥ 220,245 ¥ 51,102,178 Foreign 34,719,041 636,523 128,073 35,483,637 Loans acquired with deteriorated credit quality 8,255 9,739 18,978 36,972 Total ¥ 84,423,185 ¥ 1,832,306 ¥ 367,296 ¥ 86,622,787 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 13,256,744 ¥ 61,746 ¥ 13,318,490 Card ¥ 504,357 ¥ 61,286 ¥ 565,643 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 4,590,805 ¥ 15,119 ¥ 4,877,863 ¥ 87,648 ¥ 84,033 ¥ 9,655,468 Performing Under- Non-Performing Total (1) (in millions) Krungsri ¥ 6,241,696 ¥ 508,847 ¥ 161,047 ¥ 6,911,590 Accrual Nonaccrual Total (1) (in millions) Other ¥ 1,086,517 ¥ 31,376 ¥ 1,117,893
Credit Quality Indicators of Loans and Year of Origination by Class [Table Text Block]	Term Loans Revolving Revolving Total (1) At March 31, 2021: 2020 2019 2018 2017 2016 Prior (in millions) Commercial: ¥ 29,805,641 ¥ 10,256,709 ¥ 9,410,172 ¥ 5,360,221 ¥ 4,736,515 ¥ 6,945,092 ¥ 19,401,336 ¥ 9,776 ¥ 85,925,462 Domestic 22,402,694 6,392,946 6,126,746 3,840,964 3,649,145 5,286,408 6,934,308 — 54,633,211 Normal 21,936,776 6,058,126 5,915,318 3,666,734 3,551,332 4,847,597 6,604,586 — 52,580,469 Close Watch 431,223 319,073 195,630 162,176 74,698 317,622 306,236 — 1,806,658 Likely to become Bankrupt or Legally/Virtually Bankrupt 34,695 15,747 15,798 12,054 23,115 121,189 23,486 — 246,084 Foreign 7,402,947 3,863,763 3,283,426 1,519,257 1,087,370 1,658,684 12,467,028 9,776 31,292,251 Normal 7,158,793 3,704,240 3,155,261 1,423,064 1,032,052 1,534,943 12,231,018 9,776 30,249,147 Close Watch 200,305 118,027 91,867 60,422 51,433 69,436 197,405 — 788,895 Likely to become Bankrupt or Legally/Virtually Bankrupt 43,849 41,496 36,298 35,771 3,885 54,305 38,605 — 254,209 Residential ¥ 623,328 ¥ 847,314 ¥ 822,883 ¥ 892,166 ¥ 1,304,110 ¥ 8,660,022 ¥ 32,984 ¥ 8 ¥ 13,182,815 Accrual 623,035 846,787 822,411 891,407 1,302,427 8,599,621 30,897 — 13,116,585 Nonaccrual 293 527 472 759 1,683 60,401 2,087 8 66,230 Card ¥ 14 ¥ 96 ¥ 171 ¥ 304 ¥ 110 ¥ 513 ¥ 417,804 ¥ 60,284 ¥ 479,296 Accrual 1 10 13 19 7 79 404,301 14,666 419,096 Nonaccrual 13 86 158 285 103 434 13,503 45,618 60,200 MUAH (2) ¥ 1,406,996 ¥ 1,366,930 ¥ 915,570 ¥ 861,742 ¥ 770,568 ¥ 1,291,561 ¥ 1,882,377 ¥ — ¥ 8,495,744 Credit Quality Based on the Number of Delinquencies Accrual 472,892 608,580 324,369 552,380 516,051 656,087 130,514 — 3,260,873 Nonaccrual — 725 518 1,139 1,035 14,801 828 — 19,046 Credit Quality Based on Internal Credit Ratings Pass 920,959 707,841 486,354 287,316 236,715 542,634 1,625,799 — 4,807,618 Special Mention 4,865 31,361 49,784 14,904 9,522 30,015 76,487 — 216,938 Classified 8,280 18,423 54,545 6,003 7,245 48,024 48,749 — 191,269 Krungsri ¥ 1,316,031 ¥ 1,197,815 ¥ 958,241 ¥ 506,919 ¥ 285,427 ¥ 402,752 ¥ 1,922,946 ¥ 14,514 ¥ 6,604,645 Performing 1,251,246 1,086,710 855,915 434,818 241,811 314,114 1,754,840 — 5,939,454 Under-Performing 52,821 85,408 74,848 57,314 31,886 57,129 144,447 — 503,853 Non-Performing 11,964 25,697 27,478 14,787 11,730 31,509 23,659 14,514 161,338 Other ¥ 338,342 ¥ 164,650 ¥ 84,115 ¥ 37,394 ¥ 11,030 ¥ 8,538 ¥ 342,619 ¥ — ¥ 986,688 Accrual 335,830 159,363 79,608 35,366 10,556 8,201 331,197 — 960,121 Nonaccrual 2,512 5,287 4,507 2,028 474 337 11,422 — 26,567 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 FDIC covered loans which are not individually rated totaling ¥365 million and nil
Ages of Past Due Loans by Class [Table Text Block]	At March 31, 2020: 1-3 months Greater Total Current Total (1) 90 Days and (in millions) Commercial Domestic ¥ 9,215 ¥ 26,971 ¥ 36,186 ¥ 51,065,992 ¥ 51,102,178 ¥ 4,720 Foreign 9,927 23,548 33,475 35,450,162 35,483,637 164 Residential 48,404 15,443 63,847 13,248,278 13,312,125 6,288 Card 14,735 29,997 44,732 518,008 562,740 — MUAH 31,052 14,435 45,487 9,603,339 9,648,826 2,101 Krungsri 160,253 129,186 289,439 6,616,104 6,905,543 — Other 16,442 24,348 40,790 1,069,186 1,109,976 — Total ¥ 290,028 ¥ 263,928 ¥ 553,956 ¥ 117,571,069 ¥ 118,125,025 ¥ 13,273 At March 31, 2021: 1-3 months Greater Total Current Total (1) 90 Days and (in millions) Commercial Domestic ¥ 4,763 ¥ 22,996 ¥ 27,759 ¥ 54,605,452 ¥ 54,633,211 ¥ 4,673 Foreign 7,302 22,473 29,775 31,262,476 31,292,251 91 Residential 39,577 28,375 67,952 13,114,863 13,182,815 11,150 Card 2,127 26,786 28,913 450,383 479,296 — MUAH 42,082 29,337 71,419 8,424,325 8,495,744 4,626 Krungsri 131,573 127,533 259,106 6,345,539 6,604,645 — Other 21,776 24,201 45,977 940,711 986,688 — Total ¥ 249,200 ¥ 281,701 ¥ 530,901 ¥ 115,143,749 ¥ 115,674,650 ¥ 20,540 Note: (1) At March 31, 2020, 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. At March 31, 2021, 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.
Changes in Allowance for Credit Losses by Portfolio Segment [Table Text Block]	Fiscal year ended March 31, 2019: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of fiscal year ¥ 491,098 ¥ 42,546 ¥ 32,119 ¥ 53,765 ¥ 144,596 ¥ 764,124 Provision for (reversal of) credit losses (43,850 ) (4,480 ) 23,809 9,277 49,574 34,330 Charge-offs 76,664 274 24,310 13,224 59,569 174,041 Recoveries collected 17,565 834 932 3,733 21,053 44,117 Net charge-offs 59,099 (560 ) 23,378 9,491 38,516 129,924 Other (1) 1,466 — — (970 ) (10,842 ) (10,346 ) Balance at end of fiscal year ¥ 389,615 ¥ 38,626 ¥ 32,550 ¥ 52,581 ¥ 144,812 ¥ 658,184 Fiscal year ended Commercial Residential Card MUAH Krungsri Other Total (in millions) Allowance for credit losses: Balance at beginning of fiscal year ¥ 389,615 ¥ 38,626 ¥ 32,550 ¥ 52,581 ¥ 144,812 ¥ — ¥ 658,184 Provision for (reversal of) credit losses 153,782 (1,028 ) 26,542 30,825 70,023 41,569 321,713 Charge-offs 85,326 3,227 25,149 27,934 77,907 23,592 243,135 Recoveries collected 26,427 375 1,237 4,173 23,170 8,476 63,858 Net charge-offs 58,899 2,852 23,912 23,761 54,737 15,116 179,277 Other (1) (2,223 ) — — (650 ) 9,528 2,265 8,920 Balance at end of fiscal year ¥ 482,275 ¥ 34,746 ¥ 35,180 ¥ 58,995 ¥ 169,626 ¥ 28,718 ¥ 809,540 Fiscal year ended Commercial Residential Card MUAH Krungsri Other Total (in millions) Allowance for credit losses: Balance at beginning of fiscal year ¥ 482,275 ¥ 34,746 ¥ 35,180 ¥ 58,995 ¥ 169,626 ¥ 28,718 ¥ 809,540 Effect of adopting new guidance on measurement of credit losses on financial instruments (2) 83,828 49,494 14,262 25,037 118,333 32,750 323,704 Provision for credit losses 235,584 1,385 17,876 90,064 90,167 49,134 484,210 Charge-offs 77,904 2,745 24,564 40,376 93,192 51,725 290,506 Recoveries collected 9,262 13 1,463 4,362 23,415 6,567 45,082 Net charge-offs 68,642 2,732 23,101 36,014 69,777 45,158 245,424 Other (1) 1,532 — — (6,327 ) (14,953 ) (3,891 ) (23,639 ) Balance at end of fiscal year ¥ 734,577 ¥ 82,893 ¥ 44,217 ¥ 131,755 ¥ 293,396 ¥ 61,553 ¥ 1,348,391 Notes: (1) Other is principally comprised of gains or losses from foreign exchange translation. (2) See Note 1 for more information.
Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment [Table Text Block]	At March 31, 2020: Commercial Residential Card MUAH Krungsri Other Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 364,079 ¥ 12,651 ¥ 19,799 ¥ 5,977 ¥ 30,198 ¥ 5,073 ¥ 437,777 Collectively evaluated for impairment 108,100 21,130 15,369 53,013 139,401 22,566 359,579 Loans acquired with deteriorated credit quality (2) 10,096 965 12 5 27 1,079 12,184 Total ¥ 482,275 ¥ 34,746 ¥ 35,180 ¥ 58,995 ¥ 169,626 ¥ 28,718 ¥ 809,540 Loans: Individually evaluated for impairment ¥ 944,988 ¥ 92,448 ¥ 65,292 ¥ 67,719 ¥ 98,959 ¥ 17,512 ¥ 1,286,918 Collectively evaluated for impairment 85,640,827 13,219,677 497,448 9,581,107 6,806,584 1,092,464 116,838,107 Loans acquired with deteriorated credit quality (2) 36,972 6,365 2,903 7,007 6,047 7,917 67,211 Total (1) ¥ 86,622,787 ¥ 13,318,490 ¥ 565,643 ¥ 9,655,833 ¥ 6,911,590 ¥ 1,117,893 ¥ 118,192,236 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) Loans acquired with deteriorated credit quality in the above table include impaired loans which are individually evaluated for impairment.

Premises and Equipment _Text _2

Premises and Equipment [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Components of Premises and Equipment [Table Text Block]	Premises and equipment at March 31, 2020 and 2021 consisted of the following: 2020 2021 (in millions) Land ¥ 380,477 ¥ 379,560 Buildings 782,367 765,341 Equipment and furniture 623,676 564,273 Leasehold improvements 310,957 303,164 Construction in progress 35,594 46,513 Total 2,133,071 2,058,851 Less accumulated depreciation 1,203,542 1,183,859 Premises and equipment-net ¥ 929,529 ¥ 874,992

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Movement in Carrying Amount of Goodwill by Business Segment [Table Text Block]	Global Global Asset Global Total (in millions) Balance at March 31, 2019: Goodwill ¥ 105,339 ¥ 490,883 ¥ 27,487 ¥ 2,300 ¥ 626,009 Accumulated impairment losses (2) — (177,750 ) (14,368 ) — (192,118 ) 105,339 313,133 13,119 2,300 433,891 Goodwill acquired during the fiscal year (1) 34,553 260,639 178,308 — 473,500 Impairment loss (32,868 ) (350,942 ) — — (383,810 ) Foreign currency translation adjustments and other (1,354 ) (12,877 ) 8,276 — (5,955 ) Balance at March 31, 2020: Goodwill 138,538 738,645 214,071 2,300 1,093,554 Accumulated impairment losses (32,868 ) (528,692 ) (14,368 ) — (575,928 ) ¥ 105,670 ¥ 209,953 ¥ 199,703 ¥ 2,300 ¥ 517,626 Goodwill acquired during the fiscal year (1) 1,105 — 4,164 — 5,269 Impairment loss (30,525 ) (117,039 ) — — (147,564 ) Foreign currency translation adjustments and other 456 (10,001 ) 5,066 — (4,479 ) Balance at March 31, 2021: Goodwill 140,099 728,644 223,301 2,300 1,094,344 Accumulated impairment losses (63,393 ) (645,731 ) (14,368 ) — (723,492 ) ¥ 76,706 ¥ 82,913 ¥ 208,933 ¥ 2,300 ¥ 370,852 Notes: (1) See Note 2 for the goodwill acquired in connection with acquisitions. (2) Effective April 1, 2018, the MUFG Group reorganized its business groups. Goodwill originally recognized for Retail Banking Business Group, Corporate Banking Business Group, Trust Assets Business Group and Global Business Group other than MUAH and Krungsri was ¥1,900,019 million, which has been fully impaired before April 1, 2017. As these impairment losses recorded in past before the reorganization of the segment and are irrelevant to the annual impairment test under the new segment, the accumulated impaired loss is not allocated to new business segments after the reorganization of business group.
Carrying Amount of Other Intangible Assets by Major Class [Table Text Block]	The table below presents the gross carrying amount, accumulated amortization and net carrying amount, in total and by major class of other intangible assets at March 31, 2020 and 2021: 2020 2021 Gross Accumulated Net Gross Accumulated Net (in millions) Intangible assets subject to amortization: Software ¥ 2,852,273 ¥ 2,096,635 ¥ 755,638 ¥ 3,025,769 ¥ 2,249,340 ¥ 776,429 Customer relationships 567,886 264,636 303,250 555,796 290,641 265,155 Core deposit intangibles 174,802 100,022 74,780 164,979 102,958 62,021 Trade names 94,748 38,055 56,693 92,422 41,629 50,793 Other 17,374 5,769 11,605 16,136 5,640 10,496 Total ¥ 3,707,083 ¥ 2,505,117 1,201,966 ¥ 3,855,102 ¥ 2,690,208 1,164,894 Intangible assets not subject to amortization: Other (1) 37,560 20,100 Total ¥ 1,239,526 ¥ 1,184,994 Note: (1) Intangible assets not subject to amortization includes ¥29,641 million and ¥11,355 million of mortgage servicing rights accounted for at fair value at March 31, 2020 and 2021, respectively.
Estimated Aggregate Amortization Expense for Intangible Assets for Next Five Fiscal Years [Table Text Block]	The estimated aggregate amortization expense for intangible assets for the next five fiscal years is as follows: (in millions) Fiscal year ending March 31: 2022 ¥ 267,181 2023 228,631 2024 193,748 2025 150,403 2026 100,619

Lease Transactions _Text Bloc_2

Lease Transactions [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Profit or Loss of Lease Transactions as a Lessee [Table Text Block]	The following table presents profit or loss of lease transactions as a lessee for the fiscal years ended March 31, 2020 and 2021: 2020 2021 (in millions) Finance lease cost: Amortization of right-of-use ¥ 5,455 ¥ 4,971 Interest on lease liabilities 460 240 Operating lease cost 99,939 91,276
Information of Lease Transactions as a Lessee [Table Text Block]	2020 2021 (in millions, except years and Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases ¥ 482 ¥ 331 Operating cash flows from operating leases 106,103 102,982 Financing cash flows from finance leases 7,090 7,709 Right-of-use 12,754 3,487 Right-of-use assets obtained in exchange for new operating lease liabilities 46,482 50,564 Weighted-average remaining lease term: Finance leases 4.4 years 4.1 years Operating leases 9.5 years 8.3 years Weighted-average discount rate: Finance leases 0.99 % 0.87 % Operating leases 1.16 % 0.97 %
Maturities of Lease Liabilities as a Leasee [Table Text Block]	Finance Operating (in millions) 2022 ¥ 7,550 ¥ 106,423 2023 5,397 81,112 2024 3,735 60,525 2025 1,585 51,303 2026 748 41,089 2027 and thereafter 2,090 163,125 Total undiscounted cash flows 21,105 503,577 Difference between undiscounted and discounted cash flows (968 ) (27,473 ) Amount on balance sheet ¥ 20,137 ¥ 476,104
Profit or Loss of Lease Transactions as a Lessor [Table Text Block]	2020 2021 (in millions) Sales type and direct financing leases: Finance income on net investment ¥ 119,010 ¥ 122,810 Operating leases: Lease income 7,856 3,663 Total ¥ 126,866 ¥ 126,473
Component of Direct Financing Lease Transactions [Table Text Block]	2020 2021 (in millions) Lease receivables (undiscounted) ¥ 2,193,360 ¥ 1,913,852 Adjustments: Discounted unguaranteed residual value 15,515 15,435 Initial direct cost on sales type and direct financing leases 29,562 27,869 Deferred selling profit (364,206 ) (313,784 ) Net investment in sales type and direct financing leases ¥ 1,874,231 ¥ 1,643,372
Maturity of the Lease Payment Receivables of Direct Financing Lease Transactions [Table Text Block]	Lease (in millions) 2022 ¥ 460,067 2023 417,653 2024 352,767 2025 270,563 2026 188,168 2027 and thereafter 224,634 Total undiscounted cash flows 1,913,852 Difference between undiscounted cash flows and the lease receivables recognized on balance sheet (270,480 ) Amount on balance sheet ¥ 1,643,372

Income Taxes _Text Block_ (Tabl

Income Taxes [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income before Income Tax Expense by Jurisdiction [Table Text Block]	2019 2020 2021 (in millions) Domestic income ¥ 228,018 ¥ 89,440 ¥ 575,101 Foreign income 642,824 343,780 1,033,241 Total ¥ 870,842 ¥ 433,220 ¥ 1,608,342
Details of Current and Deferred Income Tax Expense (Benefit) [Table Text Block]	2019 2020 2021 (in millions) Current: Domestic ¥ 57,303 ¥ 28,128 ¥ 95,183 Foreign 123,730 147,344 83,492 Total 181,033 175,472 178,675 Deferred: Domestic (32,746 ) (18,949 ) 310,490 Foreign (15,050 ) (42,018 ) (44,217 ) Total (47,796 ) (60,967 ) 266,273 Income tax expense 133,237 114,505 444,948 Income tax expense (benefit) reported in Accumulated OCI relating to: Investment securities 15,590 (29,747 ) 1,146 Debt valuation adjustments 4,293 23,908 (36,792 ) Derivatives qualifying for cash flow hedges (1,845 ) 4,012 12,244 Defined benefit plans (38,229 ) (57,685 ) 139,883 Foreign currency translation adjustments 15,148 (20,693 ) (3,368 ) Total (5,043 ) (80,205 ) 113,113 Total ¥ 128,194 ¥ 34,300 ¥ 558,061
Reconciliation of Effective Income Tax Rate [Table Text Block]	2019 2020 2021 Combined normal effective statutory tax rate 30.6 % 30.6 % 30.6 % Nondeductible expenses 0.5 1.2 0.3 Impairment of goodwill — 26.1 2.4 Foreign tax credit and payments (3.3 ) (9.2 ) (0.9 ) Lower tax rates applicable to income of subsidiaries (2.5 ) (3.2 ) (1.0 ) Change in valuation allowance (1.4 ) 7.9 (0.9 ) Realization of previously unrecognized tax effects of subsidiaries — (19.8 ) (1) 0.0 Nontaxable dividends received (9.1 ) (15.6 ) (1.9 ) Undistributed earnings of subsidiaries 0.6 3.6 0.0 Tax and interest expense for uncertainty in income taxes 0.6 0.0 (0.1 ) Noncontrolling interest income (loss) 0.2 (0.1 ) 0.1 Effect of changes in tax laws 0.0 — (0.1 ) Expiration of loss carryforward 0.1 1.9 0.1 Other—net (1.0 ) 3.0 (0.9 ) Effective income tax rate 15.3 % 26.4 % 27.7 % Note: (1) In October 2019, a wholly owned subsidiary of the MUFG Group was sold. The sale resulted in the realization of tax benefits that were not previously recognized as deferred tax assets, resulting in a ¥85,588 million reduction of income tax expense and a 19.8
Components of Net Deferred Tax Assets [Table Text Block]	2020 2021 (in millions) Deferred tax assets: Allowance for credit losses ¥ 317,770 ¥ 462,369 Operating loss carryforwards 94,326 97,844 Loans 2,022 790 Accrued liabilities and other 277,807 300,942 Premises and equipment 150,116 117,322 Derivative financial instruments 96,761 69,039 Defined benefit plans 57,836 — Obligations under operating leases 133,812 132,443 Valuation allowance (151,530 ) (137,503 ) Total deferred tax assets 978,920 1,043,246 2020 2021 (in millions) Deferred tax liabilities: Investment securities (including trading account assets at fair value under the fair value option) 788,614 1,017,131 Intangible assets 87,063 70,575 Lease transactions 54,349 48,519 Defined benefit plans — 81,282 Investments in subsidiaries and affiliates 279,583 338,713 Right-of-use 106,995 100,260 Other 90,653 92,306 Total deferred tax liabilities 1,407,257 1,748,786 Net deferred tax assets (liabilities) ¥ (428,337 ) ¥ (705,540 )
Operating Loss Carryforwards and Tax Credit Carryforwards [Table Text Block]	Operating loss Tax credit (in millions) Fiscal year ending March 31: 2022 ¥ 15,457 ¥ 650 2023 5,575 8,191 2024 5,209 6,705 2025 84,080 10 2026 59,047 37 2027 1,722 70 2028 and thereafter 17,288 41,756 No definite expiration date 24,730 4,765 Total ¥ 213,108 ¥ 62,184
Roll-forward of Unrecognized Tax Benefits [Table Text Block]	2019 2020 2021 (in millions) Balance at beginning of fiscal year ¥ 12,917 ¥ 19,160 ¥ 19,249 Gross amount of increases for current year’s tax positions 313 399 202 Gross amount of decreases for current year’s tax positions — — (1,919 ) Gross amount of increases for prior years’ tax positions 8,836 212 489 Gross amount of decreases for prior years’ tax positions (1,090 ) — (2,329 ) Net amount of changes relating to settlements with tax authorities — (81 ) — Decreases due to lapse of applicable statutes of limitations (1,540 ) (297 ) (116 ) Foreign exchange translation and other (276 ) (144 ) (1,747 ) Balance at end of fiscal year ¥ 19,160 ¥ 19,249 ¥ 13,829
Roll-forward of Interest and Penalties Recognized [Table Text Block]	2019 2020 2021 (in millions) Balance at beginning of fiscal year ¥ 4,564 ¥ 3,056 ¥ 2,612 Total interest and penalties in the consolidated statements of income (1,655 ) (398 ) (398 ) Total cash settlements, foreign exchange translation and other 147 (46 ) 203 Balance at end of fiscal year ¥ 3,056 ¥ 2,612 ¥ 2,417
Status of Years under Audit or Open to Examination by Major Tax Jurisdictions [Table Text Block]	Jurisdiction Tax years Japan 2020 and forward United States—Federal 2017 and forward United States—California 2015 and forward Indonesia 2017 and forward

Pledged Assets and Collateral_2

Pledged Assets and Collateral [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Assets Mortgaged Pledged or Otherwise Subject to Lien [Table Text Block]	At March 31, 2021, assets mortgaged, pledged, or otherwise subject to lien were as follows: 2021 (in millions) Trading account securities ¥ 9,966,574 Investment securities 20,250,998 Loans 12,289,789 Other 23,745 Total ¥ 42,531,106
Pledged Assets Classified by Type of Liabilities [Table Text Block]	The above pledged assets were classified by type of liabilities to which they related as follows: 2021 (in millions) Deposits ¥ 138,491 Payables under repurchase agreements and securities lending transactions 13,118,547 Other short-term borrowings and long-term debt 29,243,996 Other 30,072 Total ¥ 42,531,106

Deposits _Text Block_ (Tables)

Deposits [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Time Deposits by Maturity [Table Text Block]	The maturity information at March 31, 2021 for domestic and foreign time deposits, including CDs, is summarized as follows: Domestic Foreign (in millions) Due in one year or less ¥ 32,811,126 ¥ 23,871,425 Due after one year through two years 4,345,312 460,277 Due after two years through three years 2,454,117 204,050 Due after three years through four years 610,596 109,874 Due after four years through five years 668,397 31,178 Due after five years 757,934 68,309 Total ¥ 41,647,482 ¥ 24,745,113

Call Money and Funds Purchase_2

Call Money and Funds Purchased [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Summary of Funds Transactions [Table Text Block]	A summary of funds transactions for the fiscal years ended March 31, 2020 and 2021 is as follows: 2020 2021 (in millions, except percentages and days) Outstanding at end of fiscal year: Amount ¥ 3,668,922 ¥ 2,353,830 Principal range of maturities 1 1 Weighted average interest rate 0.04 % 0.04 %

Due to Trust Account, Short-t_2

Due to Trust Account, Short-term Borrowings and Long-term Debt [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Summary of Due to Trust Account Transactions [Table Text Block]	2020 2021 (in millions, except percentages) Amount outstanding at end of fiscal year ¥ 3,377,747 ¥ 3,891,831 Weighted average interest rate on outstanding balance at end of fiscal year 0.00 % 0.00 %
Components of Other Short-term Borrowings [Table Text Block]	2020 2021 (in millions, except percentages) Domestic offices: Commercial paper ¥ 1,160,758 ¥ 1,207,610 Borrowings from the Bank of Japan 9,800,800 9,238,209 Borrowings from other financial institutions 191,453 141,060 Other 170,044 126,060 Total domestic offices 11,323,055 10,712,939 Foreign offices: Commercial paper 3,836,459 3,281,866 Borrowings from other financial institutions 631,502 113,874 Short-term debentures 24,009 7,775 Other 241,168 71,306 Total foreign offices 4,733,138 3,474,821 Total 16,056,193 14,187,760 Less unamortized discount 711 37 Other short-term borrowings—net ¥ 16,055,482 ¥ 14,187,723 Weighted average interest rate on outstanding balance at end of fiscal year 0.67 % 0.06 %
Components of Long-term Debt [Table Text Block]	2020 2021 (in millions) MUFG: Obligations under finance ¥ 6,552 ¥ 4,989 Unsubordinated debt (1) Fixed rate bonds, payable in US dollars, due 2021-2039, principally 0.85%-4.29% 3,864,822 4,224,401 Fixed rate bonds, payable in Euro, due 2023-2033, principally 0.34%-1.75% 408,825 482,856 Fixed rate bonds, payable in other currencies, due 2024-2029, principally 2.08%-4.05 % (2 ) 28,382 34,262 Floating rate bonds, payable in US dollars, due 2021-2023, principally 0.87%-1.24% 734,254 669,464 Floating rate bonds, payable in Euro, due 2023, principally 0.01% 41,843 45,430 Floating rate bonds, payable in other currencies, due 2024, principally 1.26% (2) 26,436 33,744 Total 5,104,562 5,490,157 Subordinated debt (1) Fixed rate bonds, payable in Japanese yen, due 2024-2031, principally 0.37%-1.39% 685,663 776,886 Adjustable rate bonds, payable in Japanese yen, due 2026-2031, principally 0.29%-0.58% 1,043,336 1,072,209 Adjustable rate bonds, payable in Japanese yen, no stated maturity, principally 0.82%-2.50% 1,756,087 1,704,816 Adjustable rate borrowings, payable in Japanese yen, due 2028-2029, principally 0.30%-0.46% 47,500 31,500 Adjustable rate borrowings, payable in Japanese yen, no stated maturity, principally 0.85%-1.17% 66,649 87,085 Floating rate bonds, payable in Japanese yen, no stated maturity, principally 3.02% 3,500 — Floating rate borrowings, payable in Japanese yen, due 2025-2028, principally 0.57%-0.79% 86,000 86,000 Total 3,688,735 3,758,496 Total 8,799,849 9,253,642 MUFG Bank: Obligations under finance ¥ 5,636 ¥ 4,628 Unsubordinated debt (1) Fixed rate bonds, payable in Japanese yen, due 2021-2027, principally 0.36%-2.34% 141,700 123,300 Fixed rate bonds, payable in US dollars, due 2021-2050, principally 0.00%-4.70% 1,104,504 1,041,115 Fixed rate bonds, payable in Euro, due 2022-2033, principally 0.88%-1.81% 108,252 109,619 Fixed rate bonds, payable in other currencies, due 2047, principally 0.00% (2) 17,620 3,100 Fixed rate borrowings, payable in Japanese yen, due 2021-2028, principally 0.00%-0.25% 10,440,217 18,689,074 Fixed rate borrowings, payable in US dollars, due 2030, principally 2.93% 8,367 7,833 Floating rate borrowings, payable in US dollars, due 2021-2031, principally 0.20%-4.11% 897,170 721,941 Floating rate borrowings, payable in Euro, due 2021-2036, principally 0.00%-0.40% 102,123 111,611 Total 12,819,953 20,807,593 Subordinated debt (1) Fixed rate bonds, payable in Japanese yen, due 2021-2031, principally 1.39%-2.91% 490,590 350,900 Fixed rate borrowings, payable in Japanese yen, due 2022-2035, principally 0.31%-2.24% 73,400 73,400 Adjustable rate borrowings, payable in Japanese yen, due 2028, principally 0.98% 12,000 10,000 Adjustable rate borrowings, payable in Japanese yen, no stated maturity, principally 2.67%-3.52% 13,500 — Floating rate borrowings, payable in Japanese yen, due 2027, principally 0.12% 15,000 15,000 Total 604,490 449,300 Obligations under loan securitization transaction accounted for as secured borrowings due 2021-2080, principally 0.11%-8.00% 791,139 618,072 Total 14,221,218 21,879,593 2020 2021 (in millions) Other subsidiaries: Obligations under finance leases ¥ 12,998 ¥ 10,520 Unsubordinated debt (1) Fixed rate borrowings, bonds and notes, payable in Japanese yen, due 2021-2051, principally 0.00%-56.00% 940,691 878,276 Fixed rate borrowings, bonds and notes, payable in US dollars, due 2021-2036, principally 0.00%-57.00% 1,106,465 885,950 Fixed rate borrowings, bonds and notes, payable in Euro, due 2021-2030, principally 0.00%-0.26% 2,965 2,719 Fixed rate borrowings, bonds and notes, payable in Thai baht, due 2021-2027, principally 0.00%-7.15% 387,799 349,666 Fixed rate borrowings, bonds and notes, payable in other currencies, due 2021-2037, principally 0.00%-10.25% (2) 360,558 320,663 Floating/Adjustable rate borrowings, bonds and notes, payable in Japanese yen, due 2021-2051, principally 0.00%-65.00% 1,259,427 1,007,882 Floating rate borrowings, bonds and notes, payable in US dollars, due 2021-2030, principally 0.00%-60.00% 378,217 174,997 Floating rate borrowings, bonds and notes, payable in Euro, due 2021-2023, principally 0.00%-4.00% 835 1,092 Floating/Adjustable rate borrowings, bonds and notes, payable in other currencies, due 2020-2024, principally 0.00%-7.30% (2) 6,804 — Total 4,443,761 3,621,245 Subordinated debt (1) Fixed rate borrowings, bonds and notes, payable in Japanese yen, due 2021-2030, principally 1.36%-2.61% 223,095 184,894 Fixed rate borrowings, bonds and notes, payable in US dollars, due 2022-2030, principally 7.50%-9.90% 737 1,212 Fixed rate borrowings, bonds and notes, payable in Thai baht, due 2027-2029, principally 3.40%-3.90% 220,756 209,189 Fixed rate borrowings, bonds and notes, payable in other currencies, due 2021, principally 0.00% (2) 7,179 6,915 Floating rate borrowings, bonds and notes, payable in Japanese yen, due 2021, principally 0.73% 2,000 — Floating rate borrowings, bonds and notes, payable in US dollars, due 2036, principally 1.95% 4,575 3,820 Total 458,342 406,030 Obligations under loan securitization transaction accounted for as secured borrowings due 2021-2022, principally 1.84%-2.25% 6,453 11 Total 4,921,554 4,037,806 Total 27,942,621 35,171,041 Debt issuance cost ¥ (15,858) ¥ (13,390) Total ¥ 27,926,763 ¥ 35,157,651 Notes: (1) Adjustable rate debts are debts where interest rates are reset in accordance with the terms of the debt agreements, and floating rate debts are debts where interest rates are repriced in accordance with movements of markets indices. (2) Minor currencies, such as Australian dollar, British pound, Indonesian rupiah, Brazilian real, Russian ruble etc., excluding Japanese yen, US dollars, Euro and Thai baht have been summarized into the “Other currencies” classification.
Summary of Subsequent Maturities of Long-term Debt [Table Text Block]	The following is a summary of maturities of long-term debt subsequent to March 31, 2021: MUFG BK Other Total (in millions) Fiscal year ending March 31: 2022 ¥ 792,201 ¥ 2,014,430 ¥ 1,065,677 ¥ 3,872,308 2023 896,760 644,383 1,025,627 2,566,770 2024 752,246 1,073,761 558,907 2,384,914 2025 979,603 16,530,494 272,391 17,782,488 2026 513,597 181,556 195,186 890,339 2027 and thereafter 5,319,235 1,434,969 920,018 7,674,222 Total ¥ 9,253,642 ¥ 21,879,593 ¥ 4,037,806 ¥ 35,171,041

Severance Indemnities and Pen_2

Severance Indemnities and Pension Plans [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Components of Net Periodic Benefit Cost of Pension Benefits, SIPs and Other Benefits [Table Text Block]	Domestic subsidiaries Foreign offices and subsidiaries 2019 2020 2021 2019 2020 2021 Pension Pension Pension Pension Other Pension Other Pension Other (in millions) Service cost—benefits earned during the fiscal year ¥ 48,352 ¥ 49,194 ¥ 46,861 ¥ 12,395 ¥ 525 ¥ 14,406 ¥ 366 ¥ 13,947 ¥ 229 Interest cost on projected benefit obligation 13,504 10,969 11,091 14,958 1,046 17,370 1,159 14,295 793 Expected return on plan assets (74,270 ) (74,744 ) (71,078 ) (33,266 ) (2,314 ) (31,382 ) (1,882 ) (31,161 ) (2,118 ) Amortization of net actuarial loss 731 5,641 17,019 9,993 707 8,685 1,162 11,560 208 Amortization of prior service cost (1,210 ) (1,204 ) (1,205 ) (3,039 ) (2,020 ) (2,633 ) (1,881 ) (2,614 ) (448 ) Loss (gain) on settlements and curtailment (5,980 ) (2,366 ) (4,605 ) 49 — 223 — 30 — Net periodic benefit cost (income) ¥ (18,873 ) ¥ (12,510 ) ¥ (1,917 ) ¥ 1,090 ¥ (2,056 ) ¥ 6,669 ¥ (1,076 ) ¥ 6,057 ¥ (1,336 )
Summary of Assumptions Used in Computation [Table Text Block]	Domestic subsidiaries Foreign offices and subsidiaries 2019 2020 2021 2019 2020 2021 Pension Pension Pension Pension Other Pension Other Pension Other Weighted-average assumptions used: Discount rates in determining expense 0.76 % 0.61 % 0.63 % 3.19 % 3.27 % 3.80 % 3.87 % 2.94 % 2.72 % Discount rates in determining benefit obligation 0.61 0.63 0.71 3.87 3.99 3.05 2.96 2.34 2.23 Rates of increase in future compensation level for determining expense 3.21 3.21 3.46 4.65 — 5.01 — 5.12 — Rates of increase in future compensation level for determining benefit obligation 3.21 3.46 3.46 5.01 — 5.12 — 5.09 — Expected rates of return on plan assets 2.83 2.89 2.93 6.70 7.50 6.25 7.00 6.19 7.00 Cash balance crediting rate for determining expense 2.46 2.46 2.46 2.74 — 3.03 — 2.39 — Cash balance crediting rate for determining benefit obligation 2.46 2.46 2.46 3.03 — 2.39 — 1.62 —
Assumed Health Care Cost Trend Rates and Effect of a One-percentage-point Change for Foreign Offices and Subsidiaries [Table Text Block]	MUAH Other than MUAH 2020 (1) 2021 (1) 2020 (1) 2021 (1) Initial trend rate 4.14 % 4.17 % 6.50 % 6.50 % Ultimate trend rate 3.77 % 3.78 % 4.50 % 4.50 % Year the rate reaches the ultimate trend rate 2027 2028 2027 2028 Note: (1) Fiscal years of MUFG Americas Holdings and foreign subsidiaries end on December 31. Therefore, the above tables present the rates and amounts at December 31, 2019 and 2020, respectively.
Combined Funded Status and Amounts Recognized in Consolidated Balance Sheets [Table Text Block]	Domestic subsidiaries Foreign offices and subsidiaries 2020 2021 2020 2021 Non-contributory Non-contributory Pension Other Pension Other (in millions) Change in benefit obligation: Benefit obligation at beginning of fiscal year ¥ 1,841,884 ¥ 1,807,905 ¥ 469,080 ¥ 31,510 ¥ 547,013 ¥ 32,383 Service cost 49,194 46,861 14,406 366 13,947 229 Interest cost 10,969 11,091 17,370 1,159 14,295 793 Plan participants’ contributions — — 28 455 30 440 Acquisitions/ Divestitures (94 ) (2,845 ) 13,000 — (260 ) — Amendments — (22 ) 3,721 — (1,187 ) — Actuarial loss (gain) (3,053 ) (21,558 ) 58,831 (1) 1,648 51,724 (1) 1,506 Benefits paid (66,771 ) (65,730 ) (21,120 ) (2,326 ) (20,816 ) (2,488 ) Lump-sum (24,224 ) (22,219 ) (2,284 ) — (2,825 ) — Translation adjustments and other — — (6,019 ) (429 ) (20,968 ) (1,509 ) Benefit obligation at end of fiscal year 1,807,905 1,753,483 547,013 32,383 580,953 31,354 Change in plan assets: Fair value of plan assets at beginning of fiscal year 2,594,788 2,432,847 493,495 28,258 559,508 31,919 Actual return on plan assets (123,802 ) 472,185 92,087 5,695 82,615 5,165 Employer contributions 28,653 21,151 2,887 186 3,896 181 Acquisitions/ Divestitures (21 ) (2,440 ) 791 — — — Plan participants’ contributions — — 28 455 30 440 Benefits paid (66,771 ) (65,730 ) (21,120 ) (2,326 ) (20,816 ) (2,488 ) Translation adjustments and other — — (8,660 ) (349 ) (20,829 ) (1,868 ) Fair value of plan assets at end of fiscal year 2,432,847 2,858,013 559,508 31,919 604,404 33,349 Amounts recognized in the consolidated balance sheets: Prepaid benefit cost ¥ 643,520 ¥ 1,122,507 ¥ 81,301 ¥ 4,378 ¥ 94,445 ¥ 6,754 Accrued benefit cost (18,577 ) (17,977 ) (68,806 ) (4,842 ) (70,994 ) (4,759 ) Net amount recognized ¥ 624,943 ¥ 1,104,530 ¥ 12,495 ¥ (464 ) ¥ 23,451 ¥ 1,995 Note: (1) Significant gains and losses related to changes in the benefit obligation for the fiscal years ended March 31, 2020 and 2021 primarily result from changes in the discount rate.
Aggregated Accumulated Benefit Obligations [Table Text Block]	Domestic Foreign offices 2020 2021 2020 2021 (in millions) Aggregated accumulated benefit obligations ¥ 1,773,042 ¥ 1,719,798 ¥ 523,078 ¥ 554,375
Summary for Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Table Text Block]	Domestic Foreign offices 2020 2021 2020 2021 (in millions) Projected benefit obligations ¥ 26,442 ¥ 24,527 ¥ 89,829 ¥ 92,527 Accumulated benefit obligations 26,442 24,527 67,609 68,720 Fair value of plan assets 7,980 6,738 21,014 21,532
Amounts Recognized in Accumulated OCI [Table Text Block]	Domestic subsidiaries Foreign offices and subsidiaries 2020 2021 2020 2021 Pension Pension Pension Other Pension Other (in millions) Net actuarial loss ¥ 437,254 ¥ 1,557 ¥ 114,167 ¥ 5,164 ¥ 96,807 ¥ 3,255 Prior service cost (4,255 ) (3,072 ) (7,875 ) (2,304 ) (6,167 ) (1,869 ) Gross amount recognized in Accumulated OCI 432,999 (1,515 ) 106,292 2,860 90,640 1,386 Taxes (174,915 ) (41,639 ) (27,974 ) (874 ) (23,900 ) (489 ) Net amount recognized in Accumulated OCI ¥ 258,084 ¥ (43,154 ) ¥ 78,318 ¥ 1,986 ¥ 66,740 ¥ 897
Amounts Recognized in OCI [Table Text Block]	Domestic subsidiaries Foreign offices and subsidiaries 2020 2021 2020 2021 Pension Pension Pension Other Pension Other (in millions) Net actuarial loss (gain) arising during the year ¥ 195,492 ¥ (423,283 ) ¥ (1,732 ) ¥ (2,166 ) ¥ 319 ¥ (1,541 ) Prior service cost arising during the year — (22 ) 3,722 — (1,187 ) — Losses (gains) due to amortization: Net actuarial loss (5,641 ) (17,019 ) (8,685 ) (1,162 ) (11,560 ) (208 ) Prior service cost 1,204 1,205 2,633 1,881 2,614 448 Curtailment and settlement 2,366 4,605 (223 ) — (30 ) — Foreign currency translation adjustments — — (1,125 ) (58 ) (5,808 ) (173 ) Total changes in Accumulated OCI ¥ 193,421 ¥ (434,514 ) ¥ (5,410 ) ¥ (1,505 ) ¥ (15,652 ) ¥ (1,474 )
Weighted-average Target Asset Allocation of Plan Assets for Pension Benefits and Other Benefits [Table Text Block]	Domestic Foreign offices Asset category Pension Pension Other Japanese equity securities 36.3 % 0.3 % — % Japanese debt securities 28.6 — — Non-Japanese 15.7 44.9 63.0 Non-Japanese 13.9 43.0 27.0 Real estate 1.4 10.0 10.0 Short-term assets 4.1 1.8 — Total 100.0 % 100.0 % 100.0 %
Estimated Future Benefit Payments [Table Text Block]	Domestic Foreign offices Pension Pension Other (in millions) Fiscal year ending March 31: 2022 ¥ 82,295 ¥ 23,248 ¥ 1,976 2023 80,857 24,078 2,012 2024 81,015 25,322 2,032 2025 80,709 26,245 2,004 2026 79,277 28,020 1,950 Thereafter (2027-2031) 387,189 173,667 8,272
Pension Benefits [Member]
Fair Values of Certain Investments Valued at Net Asset per Share (or Its Equivalent) [Table Text Block]	The following table presents fair values of certain investments valued at net asset value per share (or its equivalent) as a practical expedient that were excluded from the above table as of March 31, 2020 and 2021: Domestic Foreign offices and Assets category 2020 2021 2020 2021 (in millions) Japanese pooled funds: Japanese marketable equity securities ¥ 125,218 ¥ 118,509 ¥ — ¥ — Japanese debt securities 212,727 324,700 — — Non-Japanese 146,796 90,598 — — Non-Japanese 169,978 215,015 — — Other 100,798 153,483 — — Total pooled funds 755,517 902,305 — — Other investment funds 514,726 (1) 610,523 (1) 144,904 (2) 146,726 (2) Total ¥ 1,270,243 ¥ 1,512,828 ¥ 144,904 ¥ 146,726 Notes: (1) Other investment funds of the domestic subsidiaries include mutual funds and real estate funds of ¥486,496 million and ¥13,891 million, respectively, at March 31, 2020 and ¥580,617 million and ¥14,763 million, respectively, at March 31, 2021. (2) Other investment funds of the foreign offices and subsidiaries include mutual funds, real estate funds and common collective funds of ¥56,125 million, ¥54,474 million and ¥34,098 million, respectively, at March 31, 2020 and ¥58,086 million, ¥51,318 million and ¥37,161 million, respectively, at March 31, 2021.
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Fair Value of Each Major Category of Plan Assets [Table Text Block]	Pension benefits and SIP Investments: At March 31, 2020 Domestic subsidiaries Foreign offices and subsidiaries Assets category Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Japanese government bonds ¥ 147,926 ¥ — ¥ — ¥ 147,926 ¥ — ¥ — ¥ — ¥ — Non-Japanese — — — — 42,135 5,185 — 47,320 Other debt securities 7,014 12,113 325 19,452 — 105,096 — 105,096 Japanese marketable equity securities 690,741 — — 690,741 — — — — Non-Japanese 47,655 235 — 47,890 26,981 616 — 27,597 Other investment funds — — — — 81,803 150,121 — 231,924 (2) Japanese general account of life insurance companies (1) — 217,898 — 217,898 — — — — Other investments 6,547 32,150 — 38,697 480 1,937 250 2,667 Total ¥ 899,883 ¥ 262,396 ¥ 325 ¥ 1,162,604 ¥ 151,399 ¥ 262,955 ¥ 250 ¥ 414,604 At March 31, 2021 Domestic subsidiaries Foreign offices and subsidiaries Assets category Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Japanese government bonds ¥ 145,236 ¥ — ¥ — ¥ 145,236 ¥ — ¥ — ¥ — ¥ — Non-Japanese — — — — 44,105 4,645 — 48,750 Other debt securities 10,136 14,065 230 24,431 — 117,696 — 117,696 Japanese marketable equity securities 862,096 — — 862,096 — — — — Non-Japanese 81,525 588 — 82,113 34,584 671 — 35,255 Other investment funds — — — — 76,520 164,810 — 241,330 (2) Japanese general account of life insurance companies (1) — 217,827 — 217,827 — — — — Other investments 8,390 5,092 — 13,482 812 13,502 333 14,647 Total ¥ 1,107,383 ¥ 237,572 ¥ 230 ¥ 1,345,185 ¥ 156,021 ¥ 301,324 ¥ 333 ¥ 457,678 Notes: (1) “Japanese general accounts of life insurance companies” is a contract with life insurance companies that guarantees a return of approximately 1.24% from April 1, 2019 to March 31, 2020 and 1.25% from April 1, 2020 to March 31, 2021. (2) Other investment funds of the foreign offices and subsidiaries include mutual funds and common collective funds of ¥81,768 million and ¥119,307 million, respectively, which were held by MUFG Americas Holdings at December 31, 2019 and ¥80,717 million and ¥128,005 million, respectively, at December 31, 2020.
Foreign Offices and Subsidiaries [Member] | Pension Benefits and SIPs [Member]
Fair Value of Each Major Category of Plan Assets [Table Text Block]	At March 31, 2020 Domestic subsidiaries Foreign offices and subsidiaries Assets category Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Japanese government bonds ¥ 147,926 ¥ — ¥ — ¥ 147,926 ¥ — ¥ — ¥ — ¥ — Non-Japanese — — — — 42,135 5,185 — 47,320 Other debt securities 7,014 12,113 325 19,452 — 105,096 — 105,096 Japanese marketable equity securities 690,741 — — 690,741 — — — — Non-Japanese 47,655 235 — 47,890 26,981 616 — 27,597 Other investment funds — — — — 81,803 150,121 — 231,924 (2) Japanese general account of life insurance companies (1) — 217,898 — 217,898 — — — — Other investments 6,547 32,150 — 38,697 480 1,937 250 2,667 Total ¥ 899,883 ¥ 262,396 ¥ 325 ¥ 1,162,604 ¥ 151,399 ¥ 262,955 ¥ 250 ¥ 414,604 At March 31, 2021 Domestic subsidiaries Foreign offices and subsidiaries Assets category Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Japanese government bonds ¥ 145,236 ¥ — ¥ — ¥ 145,236 ¥ — ¥ — ¥ — ¥ — Non-Japanese — — — — 44,105 4,645 — 48,750 Other debt securities 10,136 14,065 230 24,431 — 117,696 — 117,696 Japanese marketable equity securities 862,096 — — 862,096 — — — — Non-Japanese 81,525 588 — 82,113 34,584 671 — 35,255 Other investment funds — — — — 76,520 164,810 — 241,330 (2) Japanese general account of life insurance companies (1) — 217,827 — 217,827 — — — — Other investments 8,390 5,092 — 13,482 812 13,502 333 14,647 Total ¥ 1,107,383 ¥ 237,572 ¥ 230 ¥ 1,345,185 ¥ 156,021 ¥ 301,324 ¥ 333 ¥ 457,678 Notes: (1) “Japanese general accounts of life insurance companies” is a contract with life insurance companies that guarantees a return of approximately 1.24% from April 1, 2019 to March 31, 2020 and 1.25% from April 1, 2020 to March 31, 2021. (2) Other investment funds of the foreign offices and subsidiaries include mutual funds and common collective funds of ¥81,768 million and ¥119,307 million, respectively, which were held by MUFG Americas Holdings at December 31, 2019 and ¥80,717 million and ¥128,005 million, respectively, at December 31, 2020.

Other Assets and Liabilities _2

Other Assets and Liabilities [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Major Components of Other Assets and Liabilities [Table Text Block]	2020 2021 (in millions) Other assets: Accounts receivable: Receivables from brokers, dealers and customers for securities transactions ¥ 1,191,690 ¥ 400,776 Other (1) 1,212,511 1,162,424 Investments in equity method investees 2,421,154 2,560,339 Prepaid benefit cost (Note 13) 729,199 1,223,706 Cash collateral pledged for derivative transactions (Note 9) 1,696,108 2,005,136 Cash collateral for the use of Bank of Japan’s settlement infrastructure 965,546 998,838 Accrued interest 308,448 259,336 Deferred tax assets (Note 8) 113,031 122,031 Right-of-use 393,435 338,547 Other 4,077,577 4,250,171 Total ¥ 13,108,699 ¥ 13,321,304 Other liabilities: Accounts payable: Payables to brokers, dealers and customers for securities transactions ¥ 1,078,653 ¥ 1,202,371 Other 1,251,260 1,281,436 Obligations to return securities received as collateral (Notes 15, 16 and 31) 4,806,171 6,581,759 Accrued interest 187,096 110,856 Deferred tax liabilities (Note 8) 541,368 827,571 Allowance for off-balance 56,995 83,615 Accrued benefit cost (Note 13) 92,225 93,730 Guarantees and indemnifications 39,601 38,123 Cash collateral received for derivative transactions (Note 9) 1,125,305 909,641 Obligations under operating leases (Note 7) 482,813 476,104 Accrued and other liabilities 3,562,359 3,465,614 Total ¥ 13,223,846 ¥ 15,070,820 Note: (1) Accounts receivable—Other is primarily comprised of receivables relating to the card business. The provision or reversal of the allowance for credit losses relating to the receivables is included in Non-interest expense on the condensed consolidated statements of income. The receivables relating to the card business include (1-3 million) as of March 31, 2021, and the credit quality for these receivables is primarily evaluated based on the extent of past due. The outstanding balance of the accounts receivable is presented on a net basis after allowance for credit losses. Upon adoption of the new guidance on measurement of credit losses on financial instruments as of April 1, 2020, the amount of the allowance for credit losses increased by on these receivables
Morgan Stanley [Member]
Summarized Financial Information [Table Text Block]	2020 2021 (in billions) Trading assets ¥ 29,484 ¥ 34,670 Securities purchased under agreements to resell 11,405 12,701 Securities borrowed 7,868 11,309 Total assets 103,149 128,288 Deposits 25,601 35,775 Customer and other payables 21,556 25,477 Borrowings 21,206 23,894 Total liabilities 93,656 116,377 Noncontrolling interests 149 147 2019 2020 2021 (in billions) Net revenues ¥ 4,363 ¥ 4,457 ¥ 5,841 Total non-interest expenses 3,168 3,259 3,932 Income from continuing operations before income taxes 1,195 1,140 1,881 Net income applicable to Morgan Stanley 944 903 1,433
Equity Method Investees Other than Morgan Stanley [Member]
Summarized Financial Information [Table Text Block]	2020 2021 (in billions) Net loans ¥ 15,190 ¥ 15,417 Total assets 29,255 28,459 Deposits 8,898 9,651 Total liabilities 24,025 24,176 Noncontrolling interests 1,005 85 2019 2020 2021 (in billions) Total interest income ¥ 1,036 ¥ 1,093 ¥ 1,058 Total interest expense 430 419 375 Net interest income 606 674 683 Provision for credit losses 157 171 215 Income before income tax expense 205 366 476 Net income 135 285 400

Offsetting of Derivatives, Re_2

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Summary of Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Table Text Block]	At March 31, 2020 Gross amounts of Gross amounts Net amounts Gross amounts not offset in Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 14,958 ¥ — ¥ 14,958 ¥ (11,282 ) ¥ (874 ) ¥ 2,802 Receivables under resale agreements 25,884 (1,888 ) 23,996 (23,195 ) (21 ) 780 Receivables under securities borrowing transactions 3,444 — 3,444 (3,336 ) — 108 Total ¥ 44,286 ¥ (1,888 ) ¥ 42,398 ¥ (37,813 ) ¥ (895 ) ¥ 3,690 Financial liabilities: Derivative liabilities ¥ 14,034 ¥ — ¥ 14,034 ¥ (11,296 ) ¥ (1,140 ) ¥ 1,598 Payables under repurchase agreements 33,733 (1,883 ) 31,850 (31,569 ) (34 ) 247 Payables under securities lending transactions 1,017 — 1,017 (986 ) — 31 Obligations to return securities received as collateral 4,806 — 4,806 (1,966 ) — 2,840 Total ¥ 53,590 ¥ (1,883 ) ¥ 51,707 ¥ (45,817 ) ¥ (1,174 ) ¥ 4,716 At March 31, 2021 Gross amounts of Gross amounts Net amounts Gross amounts not offset in Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 11,997 ¥ — ¥ 11,997 ¥ (8,628 ) ¥ (605 ) ¥ 2,764 Receivables under resale agreements 16,053 (2,273 ) 13,780 (12,687 ) (37 ) 1,056 Receivables under securities borrowing transactions 3,370 — 3,370 (3,289 ) — 81 Total ¥ 31,420 ¥ (2,273 ) ¥ 29,147 ¥ (24,604 ) ¥ (642 ) ¥ 3,901 Financial liabilities: Derivative liabilities ¥ 11,714 ¥ — ¥ 11,714 ¥ (8,545 ) ¥ (1,624 ) ¥ 1,545 Payables under repurchase agreements 26,800 (2,232 ) 24,568 (23,835 ) (60 ) 673 Payables under securities lending transactions 843 — 843 (814 ) (2 ) 27 Obligations to return securities received as collateral 6,582 — 6,582 (1,931 ) — 4,651 Total ¥ 45,939 ¥ (2,232 ) ¥ 43,707 ¥ (35,125 ) ¥ (1,686 ) ¥ 6,896

Repurchase Agreements, and Se_2

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Gross Obligations by Remaining Contractual Maturity and Class of Collateral Pledged [Table Text Block]	March 31, 2020 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 9,685 ¥ 16,608 ¥ 4,496 ¥ 2,944 ¥ 33,733 Payables under securities lending transactions 934 64 19 — 1,017 Obligations to return securities received as collateral 3,856 599 276 75 4,806 Total ¥ 14,475 ¥ 17,271 ¥ 4,791 ¥ 3,019 ¥ 39,556 March 31, 2021 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 6,006 ¥ 16,888 ¥ 1,973 ¥ 1,933 ¥ 26,800 Payables under securities lending transactions 789 26 28 — 843 Obligations to return securities received as collateral 5,607 278 528 169 6,582 Total ¥ 12,402 ¥ 17,192 ¥ 2,529 ¥ 2,102 ¥ 34,225
Secured Borrowing by the Class of Collateral Pledged [Table Text Block]	March 31, 2020 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 10,687 ¥ 38 ¥ 2,241 ¥ 12,966 Foreign government and official institution bonds 17,326 57 873 18,256 Corporate bonds 784 — 183 967 Residential mortgage-backed securities 4,248 — 10 4,258 Other debt securities 157 — 2 159 Marketable equity securities 506 914 1,497 2,917 Other 25 8 — 33 Total ¥ 33,733 ¥ 1,017 ¥ 4,806 ¥ 39,556 March 31, 2021 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 7,754 ¥ 104 ¥ 4,022 ¥ 11,880 Foreign government and official institution bonds 13,914 17 738 14,669 Corporate bonds 702 1 214 917 Residential mortgage-backed securities 3,729 — — 3,729 Other debt securities 218 — 5 223 Marketable equity securities 462 721 1,603 2,786 Other 21 — — 21 Total ¥ 26,800 ¥ 843 ¥ 6,582 ¥ 34,225

Common Stock and Capital Surp_2

Common Stock and Capital Surplus [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Number of Shares Issued and Outstanding [Table Text Block]	2019 2020 2021 (shares) Balance at beginning of fiscal year 13,900,028,020 13,667,770,520 13,581,995,120 Retirement of shares of common stock (232,257,500 ) (85,775,400 ) — Balance at end of fiscal year 13,667,770,520 13,581,995,120 13,581,995,120

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Changes in Accumulated OCI, Net of Tax and Net of Noncontrolling Interests [Table Text Block]	2019 2020 2021 (in millions) Accumulated other comprehensive income (loss), net of taxes: Net unrealized gains (losses) on investment securities: Balance at beginning of fiscal year ¥ 2,270,346 ¥ (369,369 ) ¥ (344,785 ) Net change during the fiscal year 60,616 24,584 (38,253 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (2,700,331 ) — — Effect of adopting new guidance on measurement of credit losses on financial instruments — — 34 Balance at end of fiscal year ¥ (369,369 ) ¥ (344,785 ) ¥ (383,004 ) Net debt valuation adjustments: Balance at beginning of fiscal year ¥ (16,488 ) ¥ (8,670 ) ¥ 45,502 Net change during the fiscal year 9,729 54,172 (83,364 ) Effect of adopting new guidance on recognition and measurement of financial assets and financial liabilities (1,911 ) — — Balance at end of fiscal year ¥ (8,670 ) ¥ 45,502 ¥ (37,862 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Balance at beginning of fiscal year ¥ (19,250 ) ¥ (24,140 ) ¥ (13,343 ) Net change during the fiscal year (4,890 ) 10,797 32,372 Balance at end of fiscal year ¥ (24,140 ) ¥ (13,343 ) ¥ 19,029 Defined benefit plans: Balance at beginning of fiscal year ¥ (119,593 ) ¥ (208,273 ) ¥ (337,918 ) Net change during the fiscal year (88,680 ) (129,645 ) 317,536 Balance at end of fiscal year ¥ (208,273 ) ¥ (337,918 ) ¥ (20,382 ) Foreign currency translation adjustments: Balance at beginning of fiscal year ¥ 362,300 ¥ 326,183 ¥ 230,127 Net change during the fiscal year (36,117 ) (96,056 ) (97,389 ) Balance at end of fiscal year ¥ 326,183 ¥ 230,127 ¥ 132,738 Balance at end of fiscal year ¥ (284,269 ) ¥ (420,417 ) ¥ (289,481 )
Before Tax and Net of Tax Changes in Each Component of Accumulated OCI [Table Text Block]	2019 2020 2021 Before tax Tax Net of tax Before tax Tax Net of tax Before tax Tax Net of tax (in millions) Net unrealized gains (losses) on investment securities: Net unrealized gains (losses) on investment securities ¥ 132,723 ¥ (24,690 ) ¥ 108,033 ¥ 100,974 ¥ (2,260 ) ¥ 98,714 ¥ (69,247 ) ¥ (599 ) ¥ (69,846 ) Reclassification adjustment for losses (gains) (28,953 ) 9,100 (19,853 ) (107,102 ) 32,007 (75,095 ) (383 ) (547 ) (930 ) Net change 103,770 (15,590 ) 88,180 (6,128 ) 29,747 23,619 (69,630 ) (1,146 ) (70,776 ) Net unrealized gains (losses) on investment securities attributable to noncontrolling interests 27,564 (965 ) (32,523 ) Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group 60,616 24,584 (38,253 ) Net debt valuation adjustments: Net debt valuation 13,006 (3,982 ) 9,024 77,765 (23,812 ) 53,953 (126,007 ) 38,584 (87,423 ) Reclassification adjustment for losses included in net income before attribution of noncontrolling interests 1,016 (311 ) 705 315 (96 ) 219 5,851 (1,792 ) 4,059 Net change 14,022 (4,293 ) 9,729 78,080 (23,908 ) 54,172 (120,156 ) 36,792 (83,364 ) Net debt valuation adjustments attributable to noncontrolling interests — — — Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group 9,729 54,172 (83,364 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Net unrealized gains (losses) on derivatives qualifying for cash flow hedges (10,397 ) 2,825 (7,572 ) 1,375 (560 ) 815 44,255 (12,359 ) 31,896 Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests 3,662 (980 ) 2,682 13,279 (3,452 ) 9,827 164 115 279 Net change (6,735 ) 1,845 (4,890 ) 14,654 (4,012 ) 10,642 44,419 (12,244 ) 32,175 2019 2020 2021 Before tax Tax Net of tax Before tax Tax Net of tax Before tax Tax Net of tax (in millions) Net unrealized losses on derivatives qualifying for cash flow hedges attributable to noncontrolling interests — (155 ) (197 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group (4,890 ) 10,797 32,372 Defined benefit plans: Defined benefit plans (126,001 ) 37,655 (88,346 ) (195,851 ) 59,426 (136,425 ) 436,435 (133,404 ) 303,031 Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests (1,168 ) 574 (594 ) 6,643 (1,741 ) 4,902 22,504 (6,479 ) 16,025 Net change (127,169 ) 38,229 (88,940 ) (189,208 ) 57,685 (131,523 ) 458,939 (139,883 ) 319,056 Defined benefit plans attributable to noncontrolling interests (260 ) (1,878 ) 1,520 Defined benefit plans attributable to Mitsubishi UFJ Financial Group (88,680 ) (129,645 ) 317,536 Foreign currency translation adjustments: Foreign currency translation adjustments (18,062 ) (17,932 ) (35,994 ) (99,520 ) 19,588 (79,932 ) (61,085 ) (14,370 ) (75,455 ) Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests (9,002 ) 2,784 (6,218 ) (2,238 ) 1,105 (1,133 ) (57,534 ) 17,738 (39,796 ) Net change (27,064 ) (15,148 ) (42,212 ) (101,758 ) 20,693 (81,065 ) (118,619 ) 3,368 (115,251 ) Foreign currency translation adjustments attributable to noncontrolling interests (6,095 ) 14,991 (17,862 ) Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group (36,117 ) (96,056 ) (97,389 ) Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group ¥ (59,342 ) ¥ (136,148) ¥ 130,902
Reclassification of Significant Items out of Accumulated OCI [Table Text Block]	2019 2020 2021 Details of Accumulated OCI components Amount reclassified out of Line items in the consolidated (in millions) Net unrealized losses (gains) on investment securities Net losses (gains) Available-for-sale ¥ (29,182 ) ¥ (108,193 ) ¥ 6,410 Investment securities gains Impairment losses on investment securities 596 1,590 6 Investment securities gains Other (367 ) (499 ) (6,799 ) (28,953 ) (107,102 ) (383 ) Total before tax 9,100 32,007 (547 ) Income tax expense ¥ (19,853 ) ¥ (75,095 ) ¥ (930 ) Net of tax Net debt valuation adjustments ¥ 1,016 ¥ 315 ¥ 5,851 Equity in earnings of equity 1,016 315 5,851 Total before tax (311 ) (96 ) (1,792 ) Income tax expense ¥ 705 ¥ 219 ¥ 4,059 Net of tax Net unrealized losses (gains) on derivatives qualifying for cash flow hedges Interest rate contracts ¥ 3,739 ¥ 9,878 ¥ (3,579 ) Interest income on Loans, Foreign exchange contracts — 3,399 3,743 Interest expense on Long- Other (77 ) 2 — 3,662 13,279 164 Total before tax (980 ) (3,452 ) 115 Income tax expense ¥ 2,682 ¥ 9,827 ¥ 279 Net of tax Defined benefit plans Net actuarial loss (1) ¥ 11,431 ¥ 15,488 ¥ 28,787 Other non-interest expenses Prior service cost (1) (6,269 ) (5,718 ) (4,267 ) Other non-interest Gain on settlements and curtailment, and other (1) (6,330 ) (3,127 ) (2,016 ) Other non-interest income or expenses (1,168 ) 6,643 22,504 Total before tax 574 (1,741 ) (6,479 ) Income tax expense ¥ (594 ) ¥ 4,902 ¥ 16,025 Net of tax Foreign currency translation adjustments ¥ (9,004 ) ¥ (5,003 ) ¥ (57,561 ) Other non-interest income 2 2,765 27 Other non-interest expenses (9,002 ) (2,238 ) (57,534 ) Total before tax 2,784 1,105 17,738 Income tax expense ¥ (6,218 ) ¥ (1,133 ) ¥ (39,796 ) Net of tax Total reclassifications for the period ¥ (34,445 ) ¥ (89,103 ) ¥ (29,398 ) Total before tax 11,167 27,823 9,035 Income tax expense ¥ (23,278 ) ¥ (61,280 ) ¥ (20,363 ) Net of tax Note: (1) These Accumulated OCI components are components of net periodic benefit cost. See Note 13 for more information.

Regulatory Capital Requiremen_2

Regulatory Capital Requirements [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Domestic, Japan [Member]
Risk-adjusted Capital Amounts and Ratios [Table Text Block]	Actual For capital Amount Ratio Amount Ratio (in millions, except percentages) Consolidated: At March 31, 2020: Total capital (to risk-weighted assets): MUFG (1) ¥ 18,279,566 15.87 % ¥ 13,827,788 12.01 % BK 14,285,601 14.43 7,917,895 8.00 TB 1,889,973 25.46 593,652 8.00 Tier 1 capital (to risk-weighted assets): MUFG (1) 15,623,321 13.56 11,525,076 10.01 BK 12,170,005 12.29 5,938,421 6.00 TB 1,625,712 21.90 445,239 6.00 Common Equity Tier 1 capital (to risk-weighted assets): MUFG (1) 13,708,333 11.90 9,798,042 8.51 BK 10,597,133 10.70 4,453,816 4.50 TB 1,444,348 19.46 333,929 4.50 Leverage ratio: MUFG 15,623,321 4.42 10,593,527 3.00 BK 12,170,005 4.21 8,656,169 3.00 TB 1,625,712 4.51 1,079,863 3.00 Actual For capital Amount Ratio Amount Ratio (in millions, except percentages) At March 31, 2021: Total capital (to risk-weighted assets): MUFG (1) ¥ 18,669,510 16.31 % ¥ 13,730,324 12.00 % BK 14,630,443 15.04 7,779,147 8.00 TB 2,099,662 22.47 747,524 8.00 Tier 1 capital (to risk-weighted assets): MUFG (1) 15,982,746 13.96 11,441,937 10.00 BK 12,411,352 12.76 5,834,360 6.00 TB 1,870,988 20.02 560,643 6.00 Common Equity Tier 1 capital (to risk-weighted assets): MUFG (1) 14,113,722 12.33 9,725,646 8.50 BK 10,865,302 11.17 4,375,770 4.50 TB 1,681,140 17.99 420,482 4.50 Leverage ratio: MUFG 15,982,746 5.45 8,781,753 3.00 BK 12,411,352 5.22 7,123,396 3.00 TB 1,870,988 7.53 744,744 3.00 Stand-alone: At March 31, 2020: Total capital (to risk-weighted assets): BK ¥ 12,092,262 14.76 % ¥ 6,550,969 8.00 % TB 2,131,514 25.42 670,714 8.00 Tier 1 capital (to risk-weighted assets): BK 10,254,608 12.52 4,913,227 6.00 TB 1,867,723 22.27 503,035 6.00 Common Equity Tier 1 capital (to risk-weighted assets): BK 8,738,975 10.67 3,684,920 4.50 TB 1,686,723 20.11 377,276 4.50 Leverage ratio: BK 10,254,608 4.02 7,644,928 3.00 TB 1,867,723 5.87 953,353 3.00 At March 31, 2021: Total capital (to risk-weighted assets): BK ¥ 12,359,493 14.60 % ¥ 6,770,631 8.00 % TB 2,294,694 21.91 837,567 8.00 Tier 1 capital (to risk-weighted assets): BK 10,512,405 12.42 5,077,974 6.00 TB 2,066,480 19.73 628,176 6.00 Common Equity Tier 1 capital (to risk-weighted assets): BK 9,025,272 10.66 3,808,480 4.50 TB 1,876,980 17.92 471,132 4.50 Leverage ratio: BK 10,512,405 5.14 6,127,521 3.00 TB 2,066,480 8.95 691,914 3.00 Note: (1) Effective March 31, 2016, the FSA’s capital conservation buffer, countercyclical buffer and G-SIB G-SIB .00
Foreign, United States of America [Member] | BK (US) [Member]
Risk-adjusted Capital Amounts and Ratios [Table Text Block]	Actual Minimum capital (1) Ratios OCC Amount Ratio Amount Ratio Amount Ratio (in millions, except percentages) BK(US): At December 31, 2019: Total capital (to risk-weighted assets) $ 14,746 15.11 % $ 10,244 10.500 % $ 9,756 10.00 % Tier 1 capital (to risk-weighted assets) 14,115 14.47 8,293 8.500 7,805 8.00 Tier 1 capital (to quarterly average assets) (2) 14,115 10.65 5,304 4.000 6,629 5.00 Common Equity Tier 1 capital (to risk-weighted assets) 14,115 14.47 6,829 7.000 6,342 6.50 At December 31, 2020: Total capital (to risk-weighted assets) $ 15,629 16.68 % $ 9,836 10.500 % $ 9,368 10.00 % Tier 1 capital (to risk-weighted assets) 14,634 15.62 7,963 8.500 7,494 8.00 Tier 1 capital (to quarterly average assets) (2) 14,634 11.12 5,262 4.000 6,577 5.00 Common Equity Tier 1 capital (to risk-weighted assets) 14,634 15.62 6,557 7.000 6,089 6.50 Notes: (1) Beginning January 1, 2019, the minimum capital requirement includes a capital conservation buffer of 2.5%. (2) Excludes certain deductions.
Foreign, United States of America [Member] | MUAH [Member]
Risk-adjusted Capital Amounts and Ratios [Table Text Block]	Actual Minimum capital (1) Amount Ratio Amount Ratio (in millions, except percentages) MUAH: At December 31, 2019: Total capital (to risk-weighted assets) $ 15,769 14.73 % $ 11,237 10.500 % Tier 1 capital (to risk-weighted assets) 15,086 14.10 9,097 8.500 Tier 1 capital (to quarterly average assets) (2) 15,086 8.88 6,792 4.000 Common Equity Tier 1 capital (to risk-weighted assets) 15,086 14.10 7,492 7.000 At December 31, 2020: Total capital (to risk-weighted assets) $ 16,871 16.29 % $ 12,843 12.400 % Tier 1 capital (to risk-weighted assets) 15,823 15.28 10,772 10.400 Tier 1 capital (to quarterly average assets) (2) 15,823 9.56 6,623 4.000 Common Equity Tier 1 capital (to risk-weighted assets) 15,823 15.28 9,218 8.900 Notes: (1) The minimum capital requirement includes a capital conservation buffer of 2.5% at December 31, 2019 and 4.4% at December 31, 2020. (2) Excludes certain deductions.

Earnings Per Common Share App_2

Earnings Per Common Share Applicable to Common Shareholders of MUFG [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Reconciliations of Net Income (Loss) and Weighted Average Number of Common Shares Outstanding Used for Computation of Basic EPS to Adjusted Amounts for Computation of Diluted EPS [Table Text Block]	2019 2020 2021 (in millions) Income (Numerator): Net income attributable to Mitsubishi UFJ Financial Group ¥ 718,645 ¥ 305,955 ¥ 1,117,298 Effect of dilutive instruments: Stock acquisition rights and restricted stock units—Morgan Stanley (3,745 ) (2,861 ) (4,159 ) Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group and assumed conversions ¥ 714,900 ¥ 303,094 ¥ 1,113,139 2019 2020 2021 (thousands of shares) Shares (Denominator): Weighted average common shares outstanding 13,058,698 12,912,790 12,859,737 Effect of dilutive instruments: Stock acquisition rights and the common shares of MUFG under the Board Incentive Plan (1) 484 166 — Weighted average common shares for diluted computation 13,059,182 12,912,956 12,859,737 2019 2020 2021 (in yen) 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 ¥ 55.03 ¥ 23.69 ¥ 86.88 Diluted earnings per common share: Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group (1) ¥ 54.74 ¥ 23.47 ¥ 86.56 Note: (1) For the fiscal years ended March 31, 2019, 2020 and 2021, the performance-based plan under the Board Incentive Plan could potentially dilute earnings per common share but were no

Derivative Financial Instrume_2

Derivative Financial Instruments [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Derivative Contracts [Table Text Block]	Notional amounts (1) 2020 2021 (in trillions) Interest rate contracts ¥ 1,553.5 ¥ 1,308.4 Foreign exchange contracts 230.2 222.0 Equity contracts 8.1 8.0 Commodity contracts 0.1 0.1 Credit derivatives 8.7 9.8 Other 3.1 3.5 Total ¥ 1,803.7 ¥ 1,551.8 Note: (1) Includes both written and purchased positions.
Fair Value Information on Derivative Instruments Recorded on Consolidated Balance Sheet [Table Text Block]	Fair value of derivative instruments 2020 (1)(5) 2021 (1)(5) Not designated (2) Designated (3) Total (4) Not designated (2) Designated (3) Total (4) (in billions) Derivative assets: Interest rate contracts ¥ 10,847 ¥ — ¥ 10,847 ¥ 7,718 ¥ — ¥ 7,718 Foreign exchange contracts 3,734 — 3,734 3,910 — 3,910 Equity contracts 236 — 236 231 — 231 Commodity contracts 26 — 26 27 — 27 Credit derivatives 114 — 114 94 — 94 Other (6) 1 — 1 17 — 17 Total derivative assets ¥ 14,958 ¥ — ¥ 14,958 ¥ 11,997 ¥ — ¥ 11,997 Derivative liabilities: Interest rate contracts ¥ 10,205 ¥ — ¥ 10,205 ¥ 7,361 ¥ — ¥ 7,361 Foreign exchange contracts 3,604 4 3,608 4,022 5 4,027 Equity contracts 277 — 277 237 — 237 Commodity contracts 26 — 26 27 — 27 Credit derivatives 95 — 95 109 — 109 Other (6) (177 ) — (177 ) (47 ) — (47 ) Total derivative liabilities ¥ 14,030 ¥ 4 ¥ 14,034 ¥ 11,709 ¥ 5 ¥ 11,714 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 and liabilities except for (6). (3) The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by certain subsidiaries. The derivative instruments which are designated as hedging instruments are presented in Other assets or Other liabilities on the accompanying 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 31. (6) Other mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, 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 2019 2020 2021 Foreign Trading Total Foreign Trading Total Foreign Trading Total (in billions) Interest rate contracts ¥ — ¥ 6 ¥ 6 ¥ — ¥ (173 ) ¥ (173 ) ¥ — ¥ 70 ¥ 70 Foreign exchange contracts (347 ) — (347 ) (429 ) — (429 ) (91 ) — (91 ) Equity — 80 80 — 30 30 — (269 ) (269 ) Credit derivatives — (40 ) (40 ) — 15 15 — (53 ) (53 ) Other (1) (7 ) (70 ) (77 ) (5 ) (31 ) (36 ) 11 (178 ) (167 ) Total ¥ (354 ) ¥ (24 ) ¥ (378 ) ¥ (434 ) ¥ (159 ) ¥ (593 ) ¥ (80 ) ¥ (430 ) ¥ (510 ) Note: (1) Other mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, Deposits and Long-term debt.
Protection Sold Through Credit Derivatives [Table Text Block]	Protection sold Maximum potential/Notional amount Fair value At March 31, 2020: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 303,870 ¥ 2,125,006 ¥ 494,040 ¥ 2,922,916 ¥ (63,855 ) Non-investment 93,671 279,892 49,681 423,244 3,358 Not rated 2,453 6,826 — 9,279 (18 ) Total 399,994 2,411,724 543,721 3,355,439 (60,515 ) Index and basket credit default swaps: Investment grade (2) 20,000 210,602 14,950 245,552 (1,823 ) Non-investment — 106,630 — 106,630 (1,360 ) Not rated 28,296 190,398 5,316 224,010 (5,205 ) Total 48,296 507,630 20,266 576,192 (8,388 ) Total credit default swaps sold 448,290 2,919,354 563,987 3,931,631 (68,903 ) Other credit derivatives sold: Investment grade — — — — — Total credit derivatives ¥ 448,290 ¥ 2,919,354 ¥ 563,987 ¥ 3,931,631 ¥ (68,903 ) Protection sold Maximum potential/Notional amount Fair value At March 31, 2021: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 294,312 ¥ 2,235,390 ¥ 715,896 ¥ 3,245,598 ¥ (67,707 ) Non-investment 84,780 311,702 59,145 455,627 5,284 Not rated — 1,683 — 1,683 (83 ) Total 379,092 2,548,775 775,041 3,702,908 (62,506 ) Index and basket credit default swaps: Investment grade (2) 43,000 470,063 29,133 542,196 (4,753 ) Non-investment 35,427 65,319 — 100,746 (1,165 ) Not rated 59,534 29,971 852 90,357 (919 ) Total 137,961 565,353 29,985 733,299 (6,837 ) Total credit default swaps sold 517,053 3,114,128 805,026 4,436,207 (69,343 ) Other credit derivatives sold (3) Investment grade (2) — 16,606 — 16,606 57 Total credit derivatives ¥ 517,053 ¥ 3,130,734 ¥ 805,026 ¥ 4,452,813 ¥ (69,286 ) 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 guarantees for exposures held by the counterparty under interest rate swaps and other types of derivative contracts.

Obligations under Guarantees _2

Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Contractual or Notional Amounts of Guarantees with Amount by Expiration Period [Table Text Block]	Maximum Amount by expiration period At March 31, 2020: 1 year 1-5 Over (in billions) Standby letters of credit and financial guarantees ¥ 4,098 ¥ 3,109 ¥ 763 ¥ 226 Performance guarantees 3,058 2,160 738 160 Derivative instruments (1) 58,836 36,021 14,543 8,272 Liabilities of trust accounts 13,142 6,752 451 5,939 Other 88 8 73 7 Total ¥ 79,222 ¥ 48,050 ¥ 16,568 ¥ 14,604 Maximum Amount by expiration period At March 31, 2021: 1 year 1-5 Over (in billions) Standby letters of credit and financial guarantees ¥ 4,055 ¥ 3,174 ¥ 698 ¥ 183 Performance guarantees 3,193 2,315 755 123 Derivative instruments (1) 38,499 15,534 15,104 7,861 Liabilities of trust accounts 10,656 5,667 718 4,271 Other 40 6 34 — Total ¥ 56,443 ¥ 26,696 ¥ 17,309 ¥ 12,438 Note: (1) Credit derivatives sold by the MUFG Group are excluded from this presentation.
Maximum Potential Amount of Future Payments Classified Based upon Internal Credit Ratings [Table Text Block]	Amount by borrower grade At March 31, 2020: Maximum Normal Close (1) Likely to (2) Not (in billions) Standby letters of credit and financial guarantees ¥ 4,098 ¥ 3,984 ¥ 93 ¥ 17 ¥ 4 Performance guarantees 3,058 2,904 96 36 22 Total ¥ 7,156 ¥ 6,888 ¥ 189 ¥ 53 ¥ 26 Amount by borrower grade At March 31, 2021: Maximum Normal Close (1) Likely to (2) Not (in billions) Standby letters of credit and financial guarantees ¥ 4,055 ¥ 3,929 ¥ 108 ¥ 15 ¥ 3 Performance guarantees 3,193 3,092 70 3 28 Total ¥ 7,248 ¥ 7,021 ¥ 178 ¥ 18 ¥ 31 Notes: (1) Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons. (2) Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment,
Contractual Amounts with Regard to Other Off-balance Sheet Instruments [Table Text Block]	2020 2021 (in billions) Commitments to extend credit ¥ 76,398 ¥ 84,614 Commercial letters of credit 757 835 Commitments to make investments 247 281 Other 5 —

Variable Interest Entities _T_2

Variable Interest Entities [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Consolidated VIEs [Member]
Assets and Liabilities of Variable Interest Entities [Table Text Block]	Consolidated VIEs Consolidated assets At March 31, 2020: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 6,263,082 ¥ 102,781 ¥ 31,625 ¥ 12,989 ¥ 1,195,283 ¥ 4,913,939 ¥ 6,465 Investment funds 493,757 — 16,482 314,074 34,121 — 129,080 Special purpose entities created for structured financing 204,047 — 2,658 — — 119,348 82,041 Repackaged instruments 249,529 1,330 — 42,052 118,776 86,859 512 Securitization of the MUFG Group’s assets 10,956,261 — — — — 10,933,580 22,681 Trust arrangements 7,527,539 — 654 336,546 745,846 6,441,864 2,629 Other 31,295 350 2,055 — — 6,885 22,005 Total consolidated assets before elimination 25,725,510 104,461 53,474 705,661 2,094,026 22,502,475 265,413 The amounts eliminated in consolidation (6,877,849 ) (103,615 ) (23,427 ) (10,592 ) (289,567 ) (6,429,880 ) (20,768 ) Total consolidated assets ¥ 18,847,661 ¥ 846 ¥ 30,047 ¥ 695,069 ¥ 1,804,459 ¥ 16,072,595 ¥ 244,645 Consolidated liabilities Total Deposits Other short-term Long-term All other (in millions) Asset-backed conduits ¥ 6,253,318 ¥ — ¥ 4,327,685 ¥ 1,478,921 ¥ 446,712 Investment funds 15,817 — — 5,546 10,271 Special purpose entities created for structured financing 114,357 — — 112,474 1,883 Repackaged instruments 251,056 — 65,965 163,833 21,258 Securitization of the MUFG Group’s assets 10,924,830 — 16,008 10,077,839 830,983 Trust arrangements 7,522,190 6,743,261 — — 778,929 Other 27,302 — 5,989 1,321 19,992 Total consolidated liabilities before elimination 25,108,870 6,743,261 4,415,647 11,839,934 2,110,028 The amounts eliminated in consolidation (15,045,398 ) (703 ) (2,526,893 ) (11,374,581 ) (1,143,221 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,465,320 ) (6,742,558 ) (1,857,923 ) (1 ) (864,838 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 598,152 ¥ — ¥ 30,831 ¥ 465,352 ¥ 101,969 Consolidated VIEs Consolidated assets At March 31, 2021: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 5,986,887 ¥ 109,439 ¥ 40,061 ¥ 5,433 ¥ 1,015,434 ¥ 4,800,221 ¥ 16,299 Investment funds 374,324 — 15,171 240,327 41,512 — 77,314 Special purpose entities created for structured financing 175,630 — 2,058 4,645 — 113,943 54,984 Repackaged instruments 281,331 3,179 — 73,914 118,199 85,782 257 Securitization of the MUFG Group’s assets 10,358,628 — 996 — — 10,339,273 18,359 Trust arrangements 9,029,390 — — 623,466 1,071,708 7,334,215 1 Other 43,320 323 3,826 17,108 — 4,660 17,403 Total consolidated assets before elimination 26,249,510 112,941 62,112 964,893 2,246,853 22,678,094 184,617 The amounts eliminated in consolidation (8,121,094 ) (110,243 ) (31,690 ) (5,892 ) (519,561 ) (7,430,166 ) (23,542 ) Total consolidated assets ¥ 18,128,416 ¥ 2,698 ¥ 30,422 ¥ 959,001 ¥ 1,727,292 ¥ 15,247,928 ¥ 161,075 Consolidated liabilities Total Deposits Other short-term Long-term All other (in millions) Asset-backed conduits ¥ 5,989,188 ¥ — ¥ 4,058,248 ¥ 1,461,043 ¥ 469,897 Investment funds 15,039 — — 5,831 9,208 Special purpose entities created for structured financing 97,226 — — 84,973 12,253 Repackaged instruments 284,795 — 21,343 195,987 67,465 Securitization of the MUFG Group’s assets 10,367,099 — 31,000 9,839,204 496,895 Trust arrangements 9,029,272 7,826,959 — — 1,202,313 Other 39,141 — 3,433 18,315 17,393 Total consolidated liabilities before elimination 25,821,760 7,826,959 4,114,024 11,605,353 2,275,424 The amounts eliminated in consolidation (14,679,458 ) — (2,422,978 ) (11,144,547 ) (1,111,933 ) The amount of liabilities with recourse to the general credit of the MUFG Group (10,547,483 ) (7,826,959 ) (1,657,447 ) (3,043 ) (1,060,034 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 594,819 ¥ — ¥ 33,599 ¥ 457,763 ¥ 103,457
Non-consolidated VIEs [Member]
Assets and Liabilities of Variable Interest Entities [Table Text Block]	Non-consolidated VIEs On-balance On-balance sheet At March 31, 2020: Total assets Maximum Total Trading Investment Loans All Total All other (in millions) Asset-backed conduits ¥ 27,700,099 ¥ 5,836,895 ¥ 4,797,551 ¥ 190 ¥ 1,737,979 ¥ 3,059,382 ¥ — ¥ — ¥ — Investment funds 55,644,434 1,918,403 1,712,037 437,858 525,022 724,253 24,904 356,679 356,679 Special purpose entities created for structured financing 37,026,192 3,601,834 2,764,156 392,588 35,774 2,317,128 18,666 6,058 6,058 Repackaged instruments 8,215,327 3,030,263 2,931,617 394,478 2,123,058 361,184 52,897 — — Other 54,962,702 2,940,349 2,314,142 191,646 — 1,995,985 126,511 41,693 41,693 Total ¥ 183,548,754 ¥ 17,327,744 ¥ 14,519,503 ¥ 1,416,760 ¥ 4,421,833 ¥ 8,457,932 ¥ 222,978 ¥ 404,430 ¥ 404,430 Non-consolidated VIEs On-balance On-balance sheet At March 31, 2021: Total assets Maximum Total Trading Investment Loans All Total All other (in millions) Asset-backed conduits ¥ 25,491,847 ¥ 5,606,965 ¥ 4,211,342 ¥ 277 ¥ 1,598,992 ¥ 2,612,073 ¥ — ¥ — ¥ — Investment funds 102,840,486 2,646,071 2,288,210 538,190 501,434 1,213,179 35,407 114,911 114,911 Special purpose entities created for structured financing 38,771,947 4,409,839 3,254,145 476,784 25,234 2,745,441 6,686 10,447 10,447 Repackaged instruments 8,604,182 3,088,564 3,008,695 611,245 2,142,482 204,332 50,636 29,478 29,478 Other 65,455,861 3,039,135 2,176,775 198,144 — 1,915,912 62,719 24,732 24,732 Total ¥ 241,164,323 ¥ 18,790,574 ¥ 14,939,167 ¥ 1,824,640 ¥ 4,268,142 ¥ 8,690,937 ¥ 155,448 ¥ 179,568 ¥ 179,568

Fees and Commissions Income __2

Fees and Commissions Income [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Details of Fees and Commissions Income [Table Text Block]	2019 2020 2021 (in millions) Fees and commissions on deposits ¥ 52,624 ¥ 53,684 ¥ 50,131 Fees and commissions on remittances and transfers 168,756 169,407 165,288 Fees and commissions on foreign trading business 73,176 66,025 79,353 Fees and commissions on credit card business 225,877 238,112 199,625 Fees and commissions on security-related services 233,448 221,494 244,017 Fees and commissions on administration and management services for investment funds 147,597 184,559 235,497 Trust fees 115,002 119,919 125,658 Guarantee fees (1) 44,962 46,322 43,889 Insurance commissions 46,918 44,415 42,117 Fees and commissions on real estate business 45,160 49,764 48,110 Other fees and commissions (2) 285,058 308,351 293,598 Total ¥ 1,438,578 ¥ 1,502,052 ¥ 1,527,283 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

Trading Account Profits and L_2

Trading Account Profits and Losses [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Net Trading Gains (Losses) [Table Text Block]	Net trading gains (losses) for the fiscal years ended March 31, 2019, 2020 and 2021 were comprised of the following: 2019 2020 2021 (in millions) Interest rate and other derivative contracts ¥ (24,031 ) ¥ (159,045 ) ¥ (429,586 ) Trading account securities, excluding derivatives 192,931 924,418 19,218 Trading account profits (losses)—net 168,900 765,373 (410,368 ) Foreign exchange derivative contracts (1) (354,401 ) (434,052 ) (79,559 ) Net trading gains (losses) ¥ (185,501 ) ¥ 331,321 ¥ (489,927 ) Note: (1) Losses on foreign exchange derivative contracts are included in Foreign exchange gains (losses)—net in the accompanying consolidated statements of income. Foreign exchange gains (losses)—net in the accompanying consolidated statements of income are also comprised of foreign exchange gains (losses) other than derivative contracts and foreign exchange gains (losses) related to the fair value option.

Business Segments _Text Block_

Business Segments [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Financial Information by Business Segment [Table Text Block]	Customer Business Global Other Total Retail & Japanese Global Global Asset Total (in billions) Fiscal year ended March 31, 2019: Net revenue: ¥ 1,502.5 ¥ 569.6 ¥ 417.4 ¥ 682.0 ¥ 203.0 ¥ 3,374.5 ¥ 436.0 ¥ (11.4 ) ¥ 3,799.1 BK and TB (1) 718.9 436.9 279.2 (1.3 ) 93.2 1,526.9 259.8 74.3 1,861.0 Net interest income 458.2 175.8 120.6 (1.3 ) — 753.3 201.1 190.8 1,145.2 Net fees 229.8 202.9 158.0 — 93.2 683.9 (16.6 ) (46.4 ) 620.9 Other 30.9 58.2 0.6 — — 89.7 75.3 (70.1 ) 94.9 Other than BK and TB 783.6 132.7 138.2 683.3 109.8 1,847.6 176.2 (85.7 ) 1,938.1 Operating expenses 1,220.9 319.5 254.9 477.8 124.6 2,397.7 226.0 103.1 2,726.8 Operating profit (loss) ¥ 281.6 ¥ 250.1 ¥ 162.5 ¥ 204.2 ¥ 78.4 ¥ 976.8 ¥ 210.0 ¥ (114.5 ) ¥ 1,072.3 Fiscal year ended March 31, 2020: Net revenue: ¥ 1,485.5 ¥ 572.7 ¥ 402.2 ¥ 795.4 ¥ 243.0 ¥ 3,498.8 ¥ 536.0 ¥ 19.8 ¥ 4,054.6 BK and TB (1) 706.6 439.1 287.1 (0.4 ) 94.6 1,527.0 319.3 31.9 1,878.2 Net interest incom e 444.4 185.7 121.4 0.4 2.5 754.4 129.5 46.4 930.3 Net fees 231.8 203.2 148.1 — 92.2 675.3 (14.8 ) (55.1 ) 605.4 Other 30.4 50.2 17.6 (0.8 ) (0.1 ) 97.3 204.6 40.6 342.5 Other than BK and TB 778.9 133.6 115.1 795.8 148.4 1,971.8 216.7 (12.1 ) 2,176.4 Operating expenses 1,195.9 324.4 260.8 564.3 171.7 2,517.1 233.2 129.3 2,879.6 Operating profit (loss) ¥ 289.6 ¥ 248.3 ¥ 141.4 ¥ 231.1 ¥ 71.3 ¥ 981.7 ¥ 302.8 ¥ (109.5 ) ¥ 1,175.0 Fiscal year ended March 31, 2021: Net revenue: ¥ 1,389.4 ¥ 559.9 ¥ 426.3 ¥ 783.2 ¥ 293.5 ¥ 3,452.3 ¥ 634.8 ¥ (4.8 ) ¥ 4,082.3 BK and TB (1) 645.1 448.8 269.3 0.8 99.4 1,463.4 389.0 30.4 1,882.8 Net interest income 405.2 183.8 133.2 1.5 5.5 729.2 213.1 34.1 976.4 Net fees 216.4 216.8 150.2 — 94.0 677.4 (4.3 ) (66.8 ) 606.3 Other 23.5 48.2 (14.1 ) (0.7 ) (0.1 ) 56.8 180.2 63.1 300.1 Other than BK and TB 744.3 111.1 157.0 782.4 194.1 1,988.9 245.8 (35.2 ) 2,199.5 Operating expenses 1,130.4 319.3 269.8 509.0 210.1 2,438.6 234.0 161.1 2,833.7 Operating profit (loss) ¥ 259.0 ¥ 240.6 ¥ 156.5 ¥ 274.2 ¥ 83.4 ¥ 1,013.7 ¥ 400.8 ¥ (165.9 ) ¥ 1,248.6 Note: (1) “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 Consolidated Statements of Income [Table Text Block]	2019 2020 2021 (in billions) Operating profit: ¥ 1,072 ¥ 1,175 ¥ 1,249 Provision for credit losses (34 ) (322 ) (484 ) Trading account profits (losses)—net 182 920 (678 ) Equity investment securities gains (losses)—net (305 ) (618 ) 1,480 Debt investment securities losses—net (3 ) (403 ) (129 ) Foreign exchange gains (losses)—net 47 (145 ) 9 Equity in earnings of equity method investees—net 210 283 356 Impairment of goodwill — (384 ) (148 ) Impairment of intangible assets (118 ) (4 ) (22 ) Reversal of (provision for) off-balance (38 ) 62 57 Other—net (142 ) (131 ) (82 ) Income before income tax expense ¥ 871 ¥ 433 ¥ 1,608

Foreign Activities _Text Bloc_2

Foreign Activities [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Estimated Financial Information by Geographic Areas [Table Text Block]	Domestic Foreign Total Japan United Europe Asia/ Other (1) (in millions) Fiscal year ended March 31, 2019: Total revenue (2) ¥ 1,886,469 ¥ 1,637,569 ¥ 222,267 ¥ 1,157,946 ¥ 504,372 ¥ 5,408,623 Total expense (3) 2,204,147 1,012,978 173,934 892,729 253,993 4,537,781 Income (loss) before income tax expense (benefit) (317,678 ) 624,591 48,333 265,217 250,379 870,842 Net income (loss) attributable to Mitsubishi UFJ Financial Group (345,148 ) 573,698 50,877 214,582 224,636 718,645 Total assets at end of fiscal year 194,070,495 49,987,389 21,535,278 27,992,986 11,642,751 305,228,899 Fiscal year ended March 31, 2020: Total revenue (2) ¥ 1,596,794 ¥ 2,223,984 ¥ 89,412 ¥ 1,326,426 ¥ 566,222 ¥ 5,802,838 Total expense (3) 2,565,895 1,051,164 218,623 1,174,200 359,736 5,369,618 Income (loss) before income tax expense (benefit) (969,101 ) 1,172,820 (129,211 ) 152,226 206,486 433,220 Net income (loss) attributable to Mitsubishi UFJ Financial Group (1,001,477 ) 1,113,913 (140,372 ) 142,568 191,323 305,955 Total assets at end of fiscal year 207,532,337 60,587,867 19,099,410 30,845,864 13,687,805 331,753,283 Fiscal year ended March 31, 2021: Total revenue (2) ¥ 3,348,733 ¥ 741,137 ¥ 356,112 ¥ 1,134,233 ¥ 329,568 ¥ 5,909,783 Total expense (3) 2,316,323 713,441 263,753 889,494 118,430 4,301,441 Income before income tax expense 1,032,410 27,696 92,359 244,739 211,138 1,608,342 Net income (loss) attributable 627,138 (231,116 ) 74,230 366,880 280,166 1,117,298 Total assets at end of fiscal year 240,603,939 49,478,851 21,126,639 31,368,443 11,246,753 353,824,625 Notes: (1) Other areas primarily include Canada, Latin America, the Caribbean and the Middle East. (2) Total revenue is comprised of Interest income and Non-interest (3) Total expense is comprised of Interest expense, Provision for (reversal of) credit losses and Non-interest
Analysis of Certain Asset and Liability Accounts Related to Foreign Activities [Table Text Block]	2020 2021 (in millions) Cash and due from banks ¥ 971,870 ¥ 1,090,501 Interest-earning deposits in other banks 12,662,558 12,377,887 Total ¥ 13,634,428 ¥ 13,468,388 Trading account assets ¥ 31,374,451 ¥ 28,525,243 Investment securities ¥ 9,040,512 ¥ 8,694,138 Loans—net of unearned income, unamortized premiums and deferred loan fees ¥ 53,079,542 ¥ 47,333,878 Deposits ¥ 49,291,478 ¥ 55,145,437 Funds borrowed: Call money, funds purchased ¥ 276,040 ¥ 323,066 Payables under repurchase agreements 13,476,026 10,974,238 Payables under securities lending transactions 176,998 130,380 Other short-term borrowings 4,733,138 3,474,821 Long-term debt 2,733,242 2,421,267 Total ¥ 21,395,444 ¥ 17,323,772 Trading account liabilities ¥ 6,575,570 ¥ 5,575,956

Fair Value _Text Block_ (Tables

Fair Value [Text Block] (Tables)	12 Months Ended
	Mar. 31, 2021
Assets and Liabilities Measured at Fair Value by Level on Recurring Basis [Table Text Block]	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, 2020 and 2021: At March 31, 2020 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 14,891,635 ¥ 17,061,985 ¥ 525,946 ¥ 32,479,566 Debt securities Japanese national government and Japanese government agency bonds 3,805,039 350,128 — 4,155,167 Japanese prefectural and municipal bonds — 93,479 — 93,479 Foreign government and official institution bonds 9,356,427 417,766 1,052 9,775,245 Corporate bonds 11 2,537,559 144 2,537,714 Residential mortgage-backed securities — 9,037,539 — 9,037,539 Asset-backed securities — 590,556 416,259 1,006,815 Other debt securities — 7,787 6,651 14,438 Commercial paper — 2,959,580 — 2,959,580 Equity securities (2) 1,730,158 1,067,591 101,840 2,899,589 Trading derivative assets 216,834 14,680,632 60,108 14,957,574 Interest rate contracts 74,488 10,758,790 13,329 10,846,607 Foreign exchange contracts 1,550 3,723,087 9,046 3,733,683 Equity contracts 140,796 87,285 7,491 235,572 Commodity contracts — 10 27,492 27,502 Credit derivatives — 111,460 2,750 114,210 Investment securities: Available-for-sale 22,126,881 11,798,392 274,930 34,200,203 Japanese national government and Japanese government agency bonds 19,897,187 3,565,692 — 23,462,879 Japanese prefectural and municipal bonds — 2,952,820 — 2,952,820 Foreign government and official institution bonds 2,229,694 792,027 15,767 3,037,488 Corporate bonds — 1,262,718 10,108 1,272,826 Residential mortgage-backed securities — 1,459,378 15 1,459,393 Commercial mortgage-backed securities — 380,278 1,977 382,255 Asset-backed securities — 1,328,601 140,875 1,469,476 Other debt securities — 56,878 106,188 163,066 Equity securities 4,471,499 296,819 39,963 4,808,281 Marketable equity securities 4,471,499 296,819 — 4,768,318 Nonmarketable equity securities (3) — — 39,963 39,963 Other (4) 1,054,186 45,913 36,701 1,136,800 Total ¥ 42,761,035 ¥ 43,883,741 ¥ 937,648 ¥ 87,582,424 At March 31, 2020 Level 1 Level 2 Level 3 Fair Value (in millions) Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 555,664 ¥ 3,718 ¥ — ¥ 559,382 Trading derivative liabilities 300,215 13,851,205 56,631 14,208,051 Interest rate contracts 153,098 10,038,198 14,079 10,205,375 Foreign exchange contracts 3,360 3,596,589 4,041 3,603,990 Equity contracts 143,757 121,229 11,713 276,699 Commodity contracts — 14 26,775 26,789 Credit derivatives — 95,175 23 95,198 Obligation to return securities received as collateral (5) 4,663,068 143,103 — 4,806,171 Other (6) — 514,003 6,606 520,609 Total ¥ 5,518,947 ¥ 14,512,029 ¥ 63,237 ¥ 20,094,213 At March 31, 2021 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 18,439,146 ¥ 13,165,127 ¥ 756,413 ¥ 32,360,686 Debt securities Japanese national government and Japanese government agency bonds 6,800,379 401,454 — 7,201,833 Japanese prefectural and municipal bonds — 193,936 — 193,936 Foreign government and official institution bonds 9,508,030 450,443 1,280 9,959,753 Corporate bonds 5,123 2,706,611 77 2,711,811 Residential mortgage-backed securities 27 6,166,313 1,000 6,167,340 Asset-backed securities — 1,045,706 336,811 1,382,517 Other debt securities — — 277,635 277,635 Commercial paper — 1,001,233 — 1,001,233 Equity securities (2) 2,125,587 1,199,431 139,610 3,464,628 Trading derivative assets 136,515 11,774,865 70,058 11,981,438 Interest rate contracts 23,906 7,673,031 21,018 7,717,955 Foreign exchange contracts 929 3,896,713 12,520 3,910,162 Equity contracts 111,680 113,586 6,309 231,575 Commodity contracts — 1 26,896 26,897 Credit derivatives — 91,534 2,354 93,888 Other (7) — — 961 961 Investment securities: Available-for-sale 34,010,613 12,817,584 289,616 47,117,813 Japanese national government and Japanese government agency bonds 32,073,409 3,199,802 — 35,273,211 Japanese prefectural and municipal bonds — 3,731,513 — 3,731,513 Foreign government and official institution bonds 1,937,204 973,041 16,718 2,926,963 Corporate bonds — 1,134,108 162 1,134,270 Residential mortgage-backed securities — 1,467,115 15 1,467,130 Commercial mortgage-backed securities — 462,966 1,599 464,565 Asset-backed securities — 1,247,565 136,920 1,384,485 Other debt securities — 37,376 134,202 171,578 Commercial paper — 564,098 — 564,098 Equity securities 5,530,077 229,415 45,569 5,805,061 Marketable equity securities 5,530,077 229,415 — 5,759,492 Nonmarketable equity securities (3) — — 45,569 45,569 Other (4) 1,202,230 42,687 18,784 1,263,701 Total ¥ 59,318,581 ¥ 38,029,678 ¥ 1,180,440 ¥ 98,528,699 At March 31, 2021 Level 1 Level 2 Level 3 Fair Value (in millions) Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 260,149 ¥ 989 ¥ — ¥ 261,138 Trading derivative liabilities 150,750 11,560,634 45,031 11,756,415 Interest rate contracts 10,696 7,343,594 6,839 7,361,129 Foreign exchange contracts 977 4,015,927 5,237 4,022,141 Equity contracts 139,077 92,655 5,686 237,418 Commodity contracts — 1 26,959 26,960 Credit derivatives — 108,457 83 108,540 Other (7) — — 227 227 Obligation to return securities received as collateral (5) 6,484,452 97,307 — 6,581,759 Other (6) — 558,553 (2,212 ) 556,341 Total ¥ 6,895,351 ¥ 12,217,483 ¥ 42,819 ¥ 19,155,653 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 were ¥66,918 million and ¥102,255 million at March 31, 2020 and 2021, respectively. The amounts of unfunded commitments related to these private equity funds were ¥102,743 million and ¥97,413 million at March 31, 2020 and 2021, respectively. (3) Excludes certain investments valued at net asset value of real estate funds and private equity and and (4) Mainly comprises securities received as collateral that may be sold or repledged under securities lending transactions and money in trust for segregating cash deposited by customers on security transactions. (5) Included in Other liabilities. (6) Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments. (7) For the period ended March 31, 2021, certain derivatives such as earthquake derivatives previously included in Commodity contracts are separately disclosed in Other of Trading derivative assets and liabilities.
Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Level 3 Inputs [Table Text Block]	March 31, Total gains (losses) Purchases Issues Sales Settlements Transfers Transfers March 31, Change in Included Included (in millions) Asset s Trading account assets: Trading securities (1) ¥ 785,326 ¥ (22,419 ) (2) ¥ — ¥ 227,656 ¥ — ¥ (214,183 ) ¥ (225,980 ) ¥ 52,140 ¥ (76,594 ) ¥ 525,946 ¥ (18,915 ) (2) Debt securities Foreign government and official institution bonds 792 589 — 93,957 — (92,748 ) (18 ) — (1,520 ) 1,052 (12 ) Corporate bonds 31,384 (279 ) — 631 — (3,937 ) (4,721 ) 24,882 (5) (47,816 ) (5) 144 (13 ) Residential mortgage-backed securities 35,181 (695 ) — — — (23,837 ) (10,649 ) — — — — Asset-backed securities 627,678 (23,494 ) — 113,239 — (93,655 ) (207,509 ) — — 416,259 (18,815 ) Other debt securities 35,148 (1,239 ) — — — — — — (27,258 ) (8) 6,651 (387 ) Equity securities 55,143 2,699 — 19,829 — (6 ) (3,083 ) 27,258 (8) — 101,840 312 Trading derivatives—net 36,170 4,503 (2) 178 714 (1,449 ) — (33,463 ) 40,857 (44,033 ) 3,477 (16,742 ) (2) Interest rate contracts—net (4,189 ) 21,290 (24 ) — — — (12,025 ) 2,254 (8,056 ) (750 ) 8,046 Foreign exchange contracts—net 18,191 (21,429 ) 89 3 — — 4,858 35,444 (5) (32,151 ) (5) 5,005 (21,483 ) Equity contracts—net 2,862 5,188 110 96 (777 ) — (11,305 ) (41 ) (355 ) (4,222 ) (2,846 ) Commodity contracts—net 949 (174 ) (1 ) 615 (672 ) — — — — 717 (167 ) Credit derivatives—net 18,357 (372 ) 4 — — — (14,991 ) 3,200 (3,471 ) 2,727 (292 ) Investment securities: Available-for-sale 283,434 (2,402 ) (3) 804 281,041 — (24 ) (300,023 ) 15,201 (3,101 ) 274,930 (934 ) (3) Foreign government and official institution bonds 19,246 — 1,625 828 — — (5,932 ) — — 15,767 — Corporate bonds 4,196 (458 ) 342 663 — (1 ) (6,734 ) 15,201 (5) (3,101 ) (5) 10,108 (934 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed 2,038 — 125 — — (23 ) (163 ) — — 1,977 — Asset-backed securities 131,455 (1,944 ) (1,085 ) 274,110 — — (261,661 ) — — 140,875 — Other debt securities 126,484 — (203 ) 5,440 — — (25,533 ) — — 106,188 — Equity securities 27,820 2,585 (3) — 12,718 — (2,527 ) (35 ) — (598 ) 39,963 863 (3) Nonmarketable equity securities 27,820 2,585 — 12,718 — (2,527 ) (35 ) — (598 ) 39,963 863 Other 32,378 (10,105 ) (7) (375 ) 44,324 — (29,334 ) (187 ) — — 36,701 (10,136 ) (7) Total ¥ 1,165,128 ¥ (27,838 ) ¥ 607 ¥ 566,453 ¥ (1,449 ) ¥ (246,068 ) ¥ (559,688 ) ¥ 108,198 ¥ (124,326 ) ¥ 881,017 ¥ (45,864 ) Liabilities Other ¥ 65,648 ¥ (5,388 ) (4) ¥ (414 ) ¥ — ¥ 2,258 ¥ — ¥ (21,133 ) ¥ 333 (6) ¥ (46,302 ) (6) ¥ 6,606 ¥ 9,648 (4) Total ¥ 65,648 ¥ (5,388 ) ¥ (414 ) ¥ — ¥ 2,258 ¥ — ¥ (21,133 ) ¥ 333 ¥ (46,302 ) ¥ 6,606 ¥ 9,648 March 31, Total gains (losses) Purchases Issues Sales Settlements Transfers Transfers March 31, Change in Included Included (in millions) Asset s Trading account assets: Trading securities (1) ¥ 525,946 ¥ 21,730 (2) ¥ — ¥ 352,917 ¥ — ¥ (189,980 ) ¥ (117,399 ) ¥ 190,391 ¥ (27,192 ) ¥ 756,413 ¥ 23,477 (2) Debt securities Foreign government and official institution bonds 1,052 625 — 49,637 — (49,927 ) (59 ) — (48 ) 1,280 159 Corporate bonds 144 31 — 82 — (180 ) — — — 77 (5 ) Residential mortgage-backed securities — — — 51,533 — (50,533 ) — — — 1,000 — Asset-backed securities 416,259 12,808 — 106,308 — (83,700 ) (114,864 ) — — 336,811 16,309 Other debt securities 6,651 11,096 — 69,499 — — — 190,389 (8) — 277,635 11,096 Equity securities 101,840 (2,830 ) — 75,858 — (5,640 ) (2,476 ) 2 (27,144 ) (8) 139,610 (4,082 ) Trading derivatives—net 3,477 45,361 (2) (104 ) 597 (653 ) — (20,689 ) (2,159 ) (803 ) 25,027 31,184 (2) Interest rate contracts—net (750 ) 14,401 (32 ) — — — 1,405 (99 ) (746 ) 14,179 11,807 Foreign exchange contracts—net 5,005 3,743 (128 ) — — — 140 (1,480 ) 3 7,283 3,812 Equity contracts—net (4,222 ) 27,299 55 3 — — (21,944 ) (580 ) 12 623 15,660 Commodity contracts—net (65 ) 1 1 — — — — — — (63 ) 1 Credit derivatives—net 2,727 (166 ) — — — — (290 ) — — 2,271 (182 ) Other—net (9) 782 83 — 594 (653 ) — — — (72 ) 734 86 Investment securities: Available-for-sale 274,930 6,710 (3) (14,559 ) 308,672 — (11 ) (276,234 ) 70 (9,962 ) 289,616 (2,779 ) (3) Foreign government and official institution bonds 15,767 — (888 ) 3,518 — — (1,679 ) — — 16,718 473 Corporate bonds 10,108 (8 ) (1 ) — — — (45 ) 70 (9,962 ) (5) 162 (10 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed 1,977 — (346 ) — — (11 ) (21 ) — — 1,599 (163 ) Asset-backed securities 140,875 6,718 (7,958 ) 267,767 — — (270,482 ) — — 136,920 (4,047 ) Other debt securities 106,188 — (5,366 ) 37,387 — — (4,007 ) — — 134,202 968 Equity securities 39,963 (3,231 ) (3) — 10,481 — (1,725 ) — 285 (204 ) 45,569 (4,150 ) (3) Nonmarketable equity securities 39,963 (3,231 ) — 10,481 — (1,725 ) — 285 (204 ) 45,569 (4,150 ) Other 36,701 (18,626 ) (7) (1,349 ) 2,346 — (18 ) (270 ) — — 18,784 (18,620 ) (7) Total ¥ 881,017 ¥ 51,944 ¥ (16,012 ) ¥ 675,013 ¥ (653 ) ¥ (191,734 ) ¥ (414,592 ) ¥ 188,587 ¥ (38,161 ) ¥ 1,135,409 ¥ 29,112 Liabilities Other ¥ 6,606 ¥ (32,946 ) (4) ¥ 937 ¥ — ¥ 5,336 ¥ — ¥ (27,823 ) ¥ (7,686 ) (6) ¥ (10,654 ) (6) ¥ (2,212 ) ¥ (17,043 ) (4) Total ¥ 6,606 ¥ (32,946 ) ¥ 937 ¥ — ¥ 5,336 ¥ — ¥ (27,823 ) ¥ (7,686 ) ¥ (10,654 ) ¥ (2,212 ) ¥ (17,043 ) Notes: (1) Includes Trading securities measured under the fair value option. (2) Included in Trading account profits (losses)—net and Foreign exchange gains (losses)—net. (3) Included in Investment securities gains (losses)—net and Other comprehensive income—net. (4) Included in Trading account profits (losses)—net. (5) Transfers into (out of) Level 3 for Foreign exchange contracts—net were mainly caused by the valuation using certain unobservable input. For the fiscal year ended March 31, 2020, 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 vendors. For the fiscal year ended March 31, 2021, transfers out of Level 3 for Corporate bonds were due to changes in the impact of unobservable credit worthiness inputs to the entire fair value measurement of the private placement bonds issued by Japanese non-public (6) Transfers into (out of) Level 3 for long-term debt in Other were mainly caused by the decrease (increase) in the observability of the key inputs to the valuation models and a corresponding increase (decrease) in the significance of the unobservable inputs. (7) Included in Fees and commissions income and Other non-interest (8) Transfers relate to the reclassification of certain securities. (9) For the fiscal year ended March 31, 2021, certain derivatives such as earthquake derivatives previously included in Commodity contracts—net are separately disclosed in Other—net of Trading derivatives—net.
Carrying Value of Assets Measured at Fair Value on Nonrecurring Basis by Level [Table Text Block]	2020 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Assets Investment securities (1)(2) ¥ — ¥ 15,473 ¥ 2,703 ¥ 18,176 ¥ — ¥ 32,421 ¥ 8,357 ¥ 40,778 Loans 2,548 9,199 260,282 272,029 2,667 5,125 255,676 263,468 Loans held for sale — — 73,573 73,573 — — 52,159 52,159 Collateral dependent loans 2,548 9,199 186,709 198,456 2,667 5,125 203,517 211,309 Premises and equipment — — 37,109 37,109 — — 15,243 15,243 Intangible assets — — 453 453 — — 2,421 2,421 Goodwill — — 283,032 283,032 — — 132,976 132,976 Other assets 73,015 — 18,609 91,624 111,626 33,840 24,512 169,978 Investments in equity method investees (1) 73,015 — 5,911 78,926 111,626 33,840 8,384 153,850 Other — — 12,698 12,698 — — 16,128 16,128 Total ¥ 75,563 ¥ 24,672 ¥ 602,188 ¥ 702,423 ¥ 114,293 ¥ 71,386 ¥ 439,185 ¥ 624,864 Notes: (1) Excludes certain investments valued at net asset value of ¥12,935 million and ¥24,319 million at March 31, 2020 and 2021, respectively. The unfunded commitments related to these investments are ¥17,216 million and ¥19,101 million at March 31, 2020 and 2021, respectively. These investments are in private equity funds. (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]	2020 2021 (in millions) Investment securities ¥ (2,171 ) ¥ (16,522 ) Loans 47,359 116,849 Loans held for sale 4,688 959 Collateral dependent loans 42,671 115,890 Premises and equipment 16,517 11,548 Intangible assets 3,732 19,200 Goodwill 383,810 147,564 Other assets 46,237 111,374 Investments in equity method investees 21,672 53,758 Other 24,565 57,616 Total ¥ 495,484 ¥ 390,013
Gains (Losses) Related to Instruments for which Fair Value Option was Elected [Table Text Block]	2019 2020 2021 Trading Foreign Total Trading Foreign Total Trading Foreign Total (in millions) Financial assets: Trading account securities (1) ¥ 208,952 ¥ 186,578 ¥ 395,530 ¥ 837,832 ¥ (596,017 ) ¥ 241,815 ¥ (370,238 ) ¥ 723,505 ¥ 353,267 Total ¥ 208,952 ¥ 186,578 ¥ 395,530 ¥ 837,832 ¥ (596,017 ) ¥ 241,815 ¥ (370,238 ) ¥ 723,505 ¥ 353,267 Financial liabilities: Other short-term borrowings (2) ¥ (5,559 ) ¥ — ¥ (5,559 ) ¥ 5,194 ¥ — ¥ 5,194 ¥ (6,484) ¥ — ¥ (6,484) Long-term debt (2) (8,322 ) — (8,322 ) (8,087 ) — (8,087 ) 1,523 — 1,523 Total ¥ (13,881 ) ¥ — ¥ (13,881 ) ¥ (2,893 ) ¥ — ¥ (2,893 ) ¥ (4,961 ) ¥ — ¥ (4,961 ) 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]	2020 2021 Remaining Fair value Fair value Remaining Fair value Fair value (in millions) Financial liabilities: Long-term debt ¥ 319,149 ¥ 304,067 ¥ (15,082 ) ¥ 420,227 ¥ 402,823 ¥ (17,404 ) Total ¥ 319,149 ¥ 304,067 ¥ (15,082 ) ¥ 420,227 ¥ 402,823 ¥ (17,404 )
Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments Not Carried at Fair Value on a Recurring Basis on Consolidated Balance Sheets by Level [Table Text Block]	Carrying Estimated fair value At March 31, 2020 Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 33,283 ¥ 33,283 ¥ 33,283 ¥ — ¥ — Interest-earning deposits in other banks 45,267 45,267 — 45,267 — Call loans and funds sold 1,169 1,169 — 1,169 — Receivables under resale agreements 23,996 23,996 — 23,996 — Receivables under securities borrowing transactions 3,444 3,444 — 3,444 — Investment securities 4,166 4,178 1,134 1,042 2,002 Loans, net of allowance for credit losses (1) 117,373 118,497 3 259 118,235 Other financial assets (2) 8,494 8,494 — 8,494 — Financial liabilities: Deposits Non-interest-bearing ¥ 33,382 ¥ 33,382 ¥ — ¥ 33,382 ¥ — Interest-bearing 170,574 170,631 — 170,631 — Total deposits 203,956 204,013 — 204,013 — Call money and funds purchased 3,669 3,669 — 3,669 — Payables under repurchase agreements 31,850 31,850 — 31,850 — Payables under securities lending transactions 1,017 1,017 — 1,017 — Due to trust account and other short-term borrowings 19,057 19,057 — 19,057 — Long-term debt 27,772 27,941 — 27,941 — Other financial liabilities 7,139 7,139 — 7,139 — Carrying Estimated fair value At March 31, 2021 Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 49,977 ¥ 49,977 ¥ 49,977 ¥ — ¥ — Interest-earning deposits in other banks 53,347 53,347 — 53,347 — Call loans and funds sold 1,256 1,256 — 1,256 — Receivables under resale agreements 13,780 13,780 — 13,780 — Receivables under securities borrowing transactions 3,370 3,370 — 3,370 — Investment securities 3,904 3,939 1,123 780 2,036 Loans, net of allowance for credit losses (1) 114,350 115,709 3 298 115,408 Other financial assets (2) 8,108 8,108 — 8,108 — Financial liabilities: Deposits Non-interest-bearing ¥ 38,521 ¥ 38,521 ¥ — ¥ 38,521 ¥ — Interest-bearing 190,695 190,712 — 190,712 — Total deposits 229,216 229,233 — 229,233 — Call money and funds purchased 2,354 2,354 — 2,354 — Payables under repurchase agreements 24,568 24,568 — 24,568 — Payables under securities lending transactions 843 843 — 843 — Due to trust account and other short-term borrowings 17,883 17,883 — 17,883 — Long-term debt 34,773 35,042 — 35,042 — Other financial liabilities 7,027 7,027 — 7,027 — Notes: (1) 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. (2) Excludes investments in equity method investees of ¥2,421 billion and ¥2,560 billion at March 31, 2020 and 2021, respectively.
Fair Value, Measurements, Recurring [Member]
Quantitative Information about Level 3 Fair Value Measurements [Table Text Block]	At March 31, 2020 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign government and official institution bonds ¥ 15,767 Return on equity method Probability of default 0.2%~1.3% 0.4% Recovery rate 55.0%~90.0% 69.9% Market-required return on capital 8.0%~10.0% 9.9% Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 92,025 Discounted cash flow Probability of default 1.2%~5.3% 5.0% Recovery rate 60.0%~76.0% 68.2% 389,170 Internal model (4) Asset correlations 1.0% 1.0% Discount factor 1.1%~1.4% 1.4% Prepayment rate 21.0% 21.0% Probability of default 0.0%~99.0% — (3) Recovery rate 57.8% 57.8% Other debt securities 6,651 Discounted cash flow Liquidity premium 2.4% 2.4% 86,734 Return on equity method Probability of default 0.0%~25.0% 0.3% Recovery rate 60.0%~90.0% 79.8% Market-required return on capital 8.0%~10.0% 9.4% Equity securities 27,144 Discounted cash flow Liquidity premium 1.0% 1.0% At March 31, 2020 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net (728 ) Option model Correlation between interest rates 32.9%~62.5% Correlation between interest rate and foreign exchange rate 16.7%~60.0% Volatility 0.0%~100.0% Foreign exchange 5,005 Option model Correlation between interest rates 30.0%~70.0% Correlation between interest rate and foreign exchange rate 15.8%~60.0% Correlation between foreign exchange rates 60.0% Volatility 7.5%~17.0% Equity contracts—net (10,038 ) Option model Correlation between foreign exchange rate and equity (58.4)%~56.9% Correlation between equities 19.5%~81.0% Volatility 24.2%~32.0% 6,166 Discounted cash flow Term of litigation 0.1 year~1.1 years At March 31, 2021 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign government and official institution bonds ¥ 16,718 Return on equity method Probability of default 0.2%~1.8% 0.5% Recovery rate 35.0%~90.0% 66.9% Market-required return on capital 8.0%~10.0% 10.0% Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 89,607 Discounted cash flow Probability of default 4.3%~4.9% 4.7% Recovery rate 78.0%~96.6% 90.6% 279,547 Internal model (4) Asset correlations 3.0% 3.0% Discount factor 1.3%~1.6% 1.3% Prepayment rate 18.3% 18.3% Probability of default 0.0%~83.7% — (3) Recovery rate 57.4% 57.4% Other debt securities 313,895 Discounted cash flow Liquidity premium 1.0%~3.2% 2.9% 79,541 Return on equity method Probability of default 0.0%~8.0% 0.4% Recovery rate 60.0%~90.0% 78.8% Market-required return on capital 8.0%~10.0% 10.0% At March 31, 2021 Fair value (1) Valuation technique Significant unobservable inputs Range Median (2) (in millions) Trading derivatives—net: Interest rate contracts—net 12,841 Option model Correlation between interest rates 30.0 %~ 44.8% Correlation between interest rate and foreign exchange rate 15.1 %~ 41.6% Volatility 0.0 %~ 65.0% Foreign exchange 7,283 Option model Correlation between interest rates 10.0 %~ 51.0% Correlation between interest rate and foreign exchange rate 0.0 %~ 38.9% Correlation between foreign exchange rates 50.0 %~ 66.4% Volatility 9.5 %~ 13.7% Equity contracts—net (4,597 ) Option model Correlation between foreign exchange rate and equity (58.4) %~ 26.2% Correlation between equities 15.0 %~ 54.0% Volatility 27.5 %~ 31.8% 5,557 Discounted cash flow Term of litigation 0.0 0.6 year Notes: (1) The fair value as of March 31, 2020 and 2021 excludes the fair value of investments valued using vendor prices. (2) Weighted average is calculated by weighing each input by the relative fair value of the respective financial instruments for investment securities. Median is used for derivative instruments. (3) See “Probability of default” in “Changes in and range of unobservable inputs”. (4) For further detail of Internal model, refer to the last paragraph of “Trading Account Assets and Liabilities—Trading Account Securities”.

Parent Company Only Financial_2

Parent Company Only Financial Information [Text Block] (Tables) - MUFG [Member]	12 Months Ended
	Mar. 31, 2021
Condensed Balance Sheets [Table Text Block]	Condensed Balance Sheets As of March 31, 2020 2021 (in millions) Assets: Cash and interest-earning deposits with banking subsidiaries ¥ 185,668 ¥ 229,380 Investments in subsidiaries and affiliated companies 16,116,568 16,658,522 Banking subsidiaries 12,361,190 12,793,367 Non-banking 3,755,378 3,865,155 Loans to subsidiaries 8,746,231 9,208,439 Banking subsidiaries 8,222,278 8,690,696 Non-banking 523,953 517,743 Other assets 241,441 197,231 Total assets ¥ 25,289,908 ¥ 26,293,572 Liabilities and Shareholders’ equity: Short-term borrowings from banking subsidiaries ¥ 1,255,991 ¥ 1,206,694 Long-term debt from non-banking 30,686 15,897 Long-term debt 8,758,646 9,226,046 Other liabilities 228,098 183,986 Total liabilities 10,273,421 10,632,623 Total shareholders’ equity 15,016,487 15,660,949 Total liabilities and shareholders’ equity ¥ 25,289,908 ¥ 26,293,572
Condensed Statements of Income [Table Text Block]	Condensed Statements of Income Fiscal years ended March 31, 2019 2020 2021 (in millions) Income: Dividends from subsidiaries and affiliated companies ¥ 306,879 ¥ 376,376 ¥ 404,064 Banking subsidiaries 207,161 277,472 317,453 Non-banking 99,718 98,904 86,611 Management fees from subsidiaries 28,305 33,543 35,095 Interest income from subsidiaries 127,117 174,500 174,816 Foreign exchange gains (losses)—net (20,598 ) 4,834 1,089 Trading account losses—net (8,078 ) (37,272 ) (18,285 ) Gains on sales of investment in subsidiaries and affiliated companies—net 252,253 67,406 95 Other income 3,199 14,968 12,552 Total income 689,077 634,355 609,426 Expense: Operating expenses 28,168 30,431 37,567 Interest expense to subsidiaries and affiliated companies 34,594 26,244 11,415 Interest expense 108,756 155,774 159,057 Other expense 1,657 15,024 8,164 Total expens e 173,175 227,473 216,203 Equity in undistributed net income (loss) of subsidiaries and affiliated companies—net 194,390 (108,069 ) 727,257 Income before income tax expense (benefit) 710,292 298,813 1,120,480 Income tax expense (benefit) (8,353 ) (7,142 ) 3,182 Net income ¥ 718,645 ¥ 305,955 ¥ 1,117,298
Condensed Statements of Cash Flows [Table Text Block]	Condensed Statements of Cash Flows Fiscal years ended March 31, 2019 2020 2021 (in millions) Operating activities: Net income ¥ 718,645 ¥ 305,955 ¥ 1,117,298 Adjustments and other (351,775 ) (1,704 ) (568,317 ) Net cash provided by operating activities 366,870 304,251 548,981 Investing activities: Proceeds from redemption of other investment securities — 240,000 — Proceeds from sales of investment in subsidiaries and affiliated companies 455,605 135,581 35,081 Purchase of equity investment in subsidiaries and an affiliated company (18,346 ) — — Net increase in loans to subsidiaries (2,112,711 ) (1,547,178 ) (462,208 ) Other—ne t (9,009 ) (12,572 ) (11,531 ) Net cash used in investing activities (1,684,461 ) (1,184,169 ) (438,658 ) Financing activities: Net decrease in short-term borrowings from subsidiaries (194,300 ) (164,272 ) (49,058 ) Proceeds from issuance of long-term debt 2,043,677 1,844,488 831,121 Repayment of long-term debt (314 ) (214,994 ) (514,436 ) Repayment of long-term debt to affiliated companies (500 ) (241,000 ) (10,500 ) Proceeds from sales of treasury stock 3 2 1 Payments for acquisition of treasury stock (150,277 ) (50,022 ) (13 ) Dividends paid (276,279 ) (304,538 ) (321,772 ) Other—net (15,490 ) (7,791 ) (1,954 ) Net cash provided by (used in) financing activities 1,406,520 861,873 (66,611 ) Net increase (decrease) in cash and cash equivalents 88,929 (18,045 ) 43,712 Cash and cash equivalents at beginning of fiscal year 114,784 203,713 185,668 Cash and cash equivalents at end of fiscal year ¥ 203,713 ¥ 185,668 ¥ 229,380

Basis of Financial Statements_4

Basis of Financial Statements and Summary of Significant Accounting Policies (Narrative) (Detail) - JPY (¥) ¥ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2021	Apr. 01, 2020
Basis of financial statements:
Increase (decrease) to net income attributable to Mitsubishi UFJ Financial Group not recognized for the fiscal year	¥ 157,320	¥ (164,480)	¥ 19,970
Summary of significant accounting policies:
Floor percentage of the corridor defined for the amortization of net actuarial gains and losses				10.00%
Minimum [Member]
Summary of significant accounting policies:
Threshold of "more likely than not" recognition for a tax position				50.00%
Measurement of credit losses on financial instruments [Member] | Effect of adopting new guidance [Member]
Accounting changes:
Increase in allowance for credit losses and allowance for off-balance sheet credit instruments					¥ 408,100
Decrease to retained earnings					¥ (285,800)
Commercial [Member] | Minimum [Member]
Summary of significant accounting policies:
Loans contractually past due before being placed on nonaccrual status, in month				1 month
Commercial [Member] | Economic Forecast Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				3 years
Commercial [Member] | Average HistoricalLoss Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				2 years
Card [Member] | Minimum [Member]
Summary of significant accounting policies:
Loans contractually past due before being placed on nonaccrual status, in month				3 months
Card [Member] | Economic Forecast Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				3 years
MUAH [Member] | Minimum [Member]
Summary of significant accounting policies:
Loans contractually past due before being placed on nonaccrual status, in month				3 months
MUAH [Member] | Economic Forecast Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				2 years
MUAH [Member] | Average HistoricalLoss Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				2 years
Krungsri [Member] | Minimum [Member]
Summary of significant accounting policies:
Loans contractually past due before being placed on nonaccrual status, in month				3 months
Residential [Member] | Minimum [Member]
Summary of significant accounting policies:
Loans contractually past due before being placed on nonaccrual status, in month				6 months
Residential [Member] | Economic Forecast Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				3 years
Residential [Member] | Average HistoricalLoss Information [Member]
Summary of significant accounting policies:
Period for determining allowances for credit losses, in year				2 years

Basis of Financial Statements_5

Basis of Financial Statements and Summary of Significant Accounting Policies (Estimated Useful Lives of Premises and Equipment) (Detail)	12 Months Ended
	Mar. 31, 2021
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Useful life, years	15 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Useful life, years	50 years
Equipment and Furniture [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Useful life, years	2 years
Equipment and Furniture [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Useful life, years	20 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Useful life, years	2 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Useful life, years	39 years

Basis of Financial Statements_6

Basis of Financial Statements and Summary of Significant Accounting Policies (Useful Lives of Intangible Assets and Amortization Method by Major Class) (Detail)	12 Months Ended
	Mar. 31, 2021
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortization method	Straight-line
Software [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	3 years
Software [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	10 years
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortization method	Straight-line
Core Deposit Intangibles [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	9 years
Core Deposit Intangibles [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	16 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortization method	Straight-line, Declining-balance
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	3 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	27 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortization method	Straight-line
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	4 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Useful life, years	40 years

Business Developments (Narrativ

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

Aug. 02, 2019JPY (¥)Subsidiaries

May 01, 2019

Apr. 29, 2019JPY (¥)¥ / shares

Apr. 29, 2019IDR (Rp)

Aug. 03, 2018JPY (¥)

Aug. 03, 2018IDR (Rp)sharesRp / shares

Dec. 29, 2017JPY (¥)

Dec. 29, 2017IDR (Rp)sharesRp / shares

Feb. 18, 2020JPY (¥)

Mar. 31, 2020JPY (¥)

Mar. 31, 2021JPY (¥)Offices

Mar. 31, 2020JPY (¥)

Mar. 31, 2019JPY (¥)

Apr. 29, 2019Rp / shares

Aug. 03, 2018shares¥ / shares

Dec. 29, 2017shares¥ / shares

Dec. 26, 2017

Business Developments [Line Items]

Goodwill, recorded on acquisition

¥ 517,626

¥ 370,852

¥ 517,626

¥ 433,891

Remeasurement profits

41,218

Revenue

1,519,884

1,921,086

2,261,068

Net income (loss)

1,117,298

¥ 305,955

¥ 718,645

Goodwill purchase accounting adjustments

¥ 1,105

Customer Relationships [Member]

Business Developments [Line Items]

Weighted average amortization period, in years

21 years

17 years

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

Business Developments [Line Items]

Final equity interest expected upon the completion of proposed transactions

73.80%

Number of offices in Indonesia | Offices

900

Description of strategic investment

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

Equity interest after acquisition, in aggregated percentage

94.10%

94.00%

94.00%

40.00%

40.00%

19.90%

19.90%

Additional equity interests acquired, in percentage

54.00%

54.00%

20.10%

20.10%

Price per share paid | (per share)

¥ 77

[1]

Rp 8,921

Rp 8,323

Rp 9,590

¥ 69

[2]

¥ 70

[3]

Investment amount paid

¥ 397,000

Rp 50,000

¥ 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 | shares

2

2

2

2

Goodwill, recorded on acquisition

254,271

Intangible assets, recorded on acquisition

[4]

¥ 146,899

Weighted average amortization period, in years

10 years 1 month 6 days

10 years 1 month 6 days

Noncontrolling interests, recorded on acquisition

51,314

¥ 51,314

Equity interest remeasured to fair value

271,830

Remeasurement profits

41,218

Acquisition-related costs

869

Revenue

119,331

Total assets

¥ 1,728,480

Total liabilities

¥ 1,242,115

Exchange rate of IDR

0.0080

0.0077

0.0084

0.0077

0.0084

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

Business Developments [Line Items]

Intangible assets, recorded on acquisition

¥ 79,552

Weighted average amortization period, in years

13 years 2 months 12 days

13 years 2 months 12 days

MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member] | Estimated Fair Value [Member]

Business Developments [Line Items]

Loans not subject to the guidance on loans and debt securities acquired with deteriorated credit quality

¥ 1,068,906

Gross contractual amounts receivable for loans

1,082,422

Gross contractual amounts receivable for loans not expected to be collected

¥ 34,363

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

Business Developments [Line Items]

Net income (loss)

¥ (4,553)

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

Business Developments [Line Items]

Equity interest after acquisition, in aggregated percentage

99.90%

99.90%

Additional equity interests acquired, in percentage

92.10%

92.10%

Price per share paid | (per share)

¥ 33

[1]

Rp 4,088

Investment amount paid

¥ 24,100

Rp 3,000

Exchange rate of IDR

0.0080

Mitsubishi UFJ Trust and Banking's Acquisition of Colonial First State Global Asset Management [Member]

Business Developments [Line Items]

Payment in cash

¥ 312,225

Equity interest after acquisition, in aggregated percentage

100.00%

Goodwill, recorded on acquisition

¥ 177,065

Intangible assets, recorded on acquisition

¥ 105,973

Weighted average amortization period, in years

18 years 8 months 12 days

Number of subsidiaries acquired | Subsidiaries

9

Acquisition-related costs

¥ 3,775

Mitsubishi UFJ Trust and Banking's Acquisition of Colonial First State Global Asset Management [Member] | Customer Relationships [Member]

Business Developments [Line Items]

Intangible assets, recorded on acquisition

¥ 100,862

Weighted average amortization period, in years

18 years

Mitsubishi UFJ Trust and Banking's Acquisition of Colonial First State Global Asset Management [Member] | Estimated Fair Value [Member]

Business Developments [Line Items]

Intangible assets, recorded on acquisition

¥ 105,973

Total assets

197,867

Cash and bank deposits

42,019

Total liabilities

68,519

Accrued bonuses

¥ 18,769

Mitsubishi UFJ Trust and Banking's Acquisition of Colonial First State Global Asset Management [Member] | First Sentier Investors [Member]

Business Developments [Line Items]

Revenue

38,508

Net income (loss)

¥ (734)

MUFG Bank's Acquisition of DVB Bank SE's Aviation Finance Division [Member]

Business Developments [Line Items]

Payment in cash

¥ 555,000

Goodwill, recorded on acquisition

32,591

Total assets

522,797

Total liabilities

¥ 138

[1]

Calculated based on the exchange rate of IDR1 = ¥0.0080

[2]

Calculated based on the exchange rate of IDR1 = ¥0.0077

[3]

Calculated based on the exchange rate of IDR1 = ¥0.0084

[4]

Intangible assets with a weighted average amortization period of 13.2 years primarily include ¥79,552 million of relationships with agents with a weighted average amortization period of 13.1 years and ¥44,140 million of core deposit intangibles with a weighted average amortization period of 10.1 years.

Business Developments (Estimate

Business Developments (Estimated Fair Values of the Assets Acquired and Liabilities Assumed Related to Acquisition of Danamon) (Detail) - JPY (¥) ¥ in Millions		Apr. 29, 2019	Mar. 31, 2021	Mar. 31, 2020
Customer Relationships [Member]
Business Developments [Line Items]
Weighted average amortization period, in years			21 years	17 years
Core Deposit Intangibles [Member]
Business Developments [Line Items]
Weighted average amortization period, in years				10 years
MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member]
Business Developments [Line Items]
Loans		¥ 1,086,638
Intangible assets	[1]	146,899
Total assets		1,728,480
Deposits—Total deposits		915,075
Total liabilities		¥ 1,242,115
Weighted average amortization period, in years		10 years 1 month 6 days
MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member] | Customer Relationships [Member]
Business Developments [Line Items]
Intangible assets		¥ 79,552
Weighted average amortization period, in years		13 years 2 months 12 days
MUFG Bank's Acquisition of Shares in Bank Danamon in Indonesia [Member] | Core Deposit Intangibles [Member]
Business Developments [Line Items]
Intangible assets		¥ 44,140
Weighted average amortization period, in years		13 years 1 month 6 days
[1]	Intangible assets with a weighted average amortization period of 13.2 years primarily include ¥79,552 million of relationships with agents with a weighted average amortization period of 13.1 years and ¥44,140 million of core deposit intangibles with a weighted average amortization period of 10.1 years.

Business Developments (Estima_2

Business Developments (Estimated Fair Values of the Assets Acquired and Liabilities Assumed Related to Acquisition of DVB Bank SE's Aviation Finance Division) (Detail) - MUFG Bank's Acquisition of DVB Bank SE's Aviation Finance Division [Member] ¥ in Millions	Feb. 18, 2020JPY (¥)
Business Developments [Line Items]
Loans	¥ 515,933
Total assets	522,797
Total liabilities	¥ 138

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Investment Securities [Line Items]
Gross realized gains on sales of Available-for-sale debt securities	¥ 42,123	¥ 151,015	¥ 45,244
Gross realized losses on sales of Available-for-sale debt securities	48,606	44,662	16,541
Corporate Bonds [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of debt securities included in Investment securities gains (losses)—net		¥ 1,590	¥ 606
Residential 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

Investment Securities (Amortize

Investment Securities (Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Investment Securities) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	¥ 46,863,845		¥ 33,907,767
Available-for-sale debt securities, Gross unrealized gains	313,191		343,331
Available-for-sale debt securities, Gross unrealized losses	59,223		50,895
Available-for-sale debt securities, Fair value	47,117,813		34,200,203
Held-to-maturity debt securities, Amortized cost	3,903,763		4,165,781
Held-to-maturity debt securities, Gross unrealized gains	50,452		43,847
Held-to-maturity debt securities, Gross unrealized losses	15,072		31,734
Held-to-maturity debt securities, Fair value	3,939,143		4,177,894
Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	35,166,245		23,308,538
Available-for-sale debt securities, Gross unrealized gains	147,844		185,302
Available-for-sale debt securities, Gross unrealized losses	40,878		30,961
Available-for-sale debt securities, Fair value	35,273,211		23,462,879
Held-to-maturity debt securities, Amortized cost	1,100,447		1,100,574
Held-to-maturity debt securities, Gross unrealized gains	23,033		29,856
Held-to-maturity debt securities, Gross unrealized losses
Held-to-maturity debt securities, Fair value	1,123,480		1,130,430
Japanese Prefectural and Municipal Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	3,719,205		2,938,743
Available-for-sale debt securities, Gross unrealized gains	15,123		16,279
Available-for-sale debt securities, Gross unrealized losses	2,815		2,202
Available-for-sale debt securities, Fair value	3,731,513		2,952,820
Foreign Government and Official Institution Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	2,854,037		2,936,110
Available-for-sale debt securities, Gross unrealized gains	84,707		107,406
Available-for-sale debt securities, Gross unrealized losses	11,781		6,028
Available-for-sale debt securities, Fair value	2,926,963		3,037,488
Held-to-maturity debt securities, Amortized cost	233,883		151,555
Held-to-maturity debt securities, Gross unrealized gains	2,262		243
Held-to-maturity debt securities, Gross unrealized losses	2,795		689
Held-to-maturity debt securities, Fair value	233,350		151,109
Corporate Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,123,271		1,261,586
Available-for-sale debt securities, Gross unrealized gains	11,400		12,445
Available-for-sale debt securities, Gross unrealized losses	401		1,205
Available-for-sale debt securities, Fair value	1,134,270		1,272,826
Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,459,062		1,460,641
Available-for-sale debt securities, Gross unrealized gains	9,119		3,083
Available-for-sale debt securities, Gross unrealized losses	1,051		4,331
Available-for-sale debt securities, Fair value	1,467,130		1,459,393
Held-to-maturity debt securities, Amortized cost	411,024		737,242
Held-to-maturity debt securities, Gross unrealized gains	18,590		10,478
Held-to-maturity debt securities, Gross unrealized losses	0	[1]	3,012	[2]
Held-to-maturity debt securities, Fair value	429,614		744,708
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	4,849		8,215
Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	435,975		379,234
Available-for-sale debt securities, Gross unrealized gains	29,502		6,110
Available-for-sale debt securities, Gross unrealized losses	912		3,089
Available-for-sale debt securities, Fair value	464,565		382,255
Held-to-maturity debt securities, Amortized cost	111,750		146,039
Held-to-maturity debt securities, Gross unrealized gains	4,846		2,993
Held-to-maturity debt securities, Gross unrealized losses	0	[1]	317	[2]
Held-to-maturity debt securities, Fair value	116,596		148,715
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	1,920		3,178
Asset-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	1,373,450		1,461,083
Available-for-sale debt securities, Gross unrealized gains	11,685		9,516
Available-for-sale debt securities, Gross unrealized losses	650		1,123
Available-for-sale debt securities, Fair value	1,384,485		1,469,476
Held-to-maturity debt securities, Amortized cost	2,046,659		2,030,371
Held-to-maturity debt securities, Gross unrealized gains	1,721		277
Held-to-maturity debt securities, Gross unrealized losses	12,277		27,716
Held-to-maturity debt securities, Fair value	2,036,103		2,002,932
Other Debt Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	168,528		161,832	[3]
Available-for-sale debt securities, Gross unrealized gains	3,780		3,190	[3]
Available-for-sale debt securities, Gross unrealized losses	730		1,956	[3]
Available-for-sale debt securities, Fair value	171,578		163,066	[3]
Other Debt Securities [Member] | Private Placement Debt Conduit Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value			¥ 86,734
Commercial Paper [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Amortized cost	564,072
Available-for-sale debt securities, Gross unrealized gains	31
Available-for-sale debt securities, Gross unrealized losses	5
Available-for-sale debt securities, Fair value	¥ 564,098
[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 consolidated balance sheets were ¥4,849 million and ¥1,920 million, respectively, at March 31, 2021 and are not included in the table above.
[2]	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 consolidated balance sheets were ¥8,215 million and ¥3,178 million, respectively, at March 31, 2020 and are not included in the table above.
[3]	Other debt securities in the table above mainly include ¥86,734 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	Mar. 31, 2021	Mar. 31, 2020
Held-to-maturity debt securities, Amortized cost:
Due in one year or less	¥ 14,562
Due from one year to five years	1,179,959
Due from five years to ten years	826,833
Due after ten years	1,882,409
Held-to-maturity debt securities, Amortized cost	3,903,763	¥ 4,165,781
Held-to-maturity debt securities, Fair value:
Due in one year or less	14,572
Due from one year to five years	1,205,257
Due from five years to ten years	827,481
Due after ten years	1,891,833
Held-to-maturity debt securities, Fair value	3,939,143	4,177,894
Available-for-sale debt securities, Fair value:
Due in one year or less	24,815,321
Due from one year to five years	8,129,683
Due from five years to ten years	8,549,713
Due after ten years	5,623,096
Available-for-sale debt securities, Fair value	¥ 47,117,813	¥ 34,200,203

Investment Securities (Investme

Investment Securities (Investments by Length and Category in Continuous Loss Position) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)Securities	Mar. 31, 2020JPY (¥)Securities
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 14,238,837	¥ 14,344,490
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	46,545	44,087
Available-for-sale debt securities, Fair value, 12 months or more	1,199,049	646,265
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	12,678	6,808
Available-for-sale debt securities, Fair value, Total	15,437,886	14,990,755
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 59,223	¥ 50,895
Available-for-sale debt securities, Number of securities | Securities	1,235	1,408
Held-to-maturity debt securities, Fair value, Less than 12 months		¥ 811,706
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months		10,290
Held-to-maturity debt securities, Fair value, 12 months or more		1,754,352
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more		21,444
Held-to-maturity debt securities, Fair value, Total		2,566,058
Held-to-maturity debt securities, Gross unrealized losses, Total		¥ 31,734
Held-to-maturity debt securities, Number of securities | Securities		398
Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 12,098,437	¥ 11,781,600
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	31,055	30,961
Available-for-sale debt securities, Fair value, 12 months or more	429,235
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	9,823
Available-for-sale debt securities, Fair value, Total	12,527,672	11,781,600
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 40,878	¥ 30,961
Available-for-sale debt securities, Number of securities | Securities	286	202
Japanese Prefectural and Municipal Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 870,007	¥ 935,540
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	1,584	2,202
Available-for-sale debt securities, Fair value, 12 months or more	276,172
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	1,231
Available-for-sale debt securities, Fair value, Total	1,146,179	935,540
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 2,815	¥ 2,202
Available-for-sale debt securities, Number of securities | Securities	405	340
Foreign Government and Official Institution Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 429,204	¥ 564,620
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	11,768	5,481
Available-for-sale debt securities, Fair value, 12 months or more	50,478	114,407
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	13	547
Available-for-sale debt securities, Fair value, Total	479,682	679,027
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 11,781	¥ 6,028
Available-for-sale debt securities, Number of securities | Securities	71	153
Held-to-maturity debt securities, Fair value, Less than 12 months		¥ 55,746
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months		689
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		55,746
Held-to-maturity debt securities, Gross unrealized losses, Total		¥ 689
Held-to-maturity debt securities, Number of securities | Securities		9
Corporate Bonds [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 96,582	¥ 522,941
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	166	1,191
Available-for-sale debt securities, Fair value, 12 months or more	229,518	25,228
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	235	14
Available-for-sale debt securities, Fair value, Total	326,100	548,169
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 401	¥ 1,205
Available-for-sale debt securities, Number of securities | Securities	120	154
Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 378,351	¥ 114,057
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	577	530
Available-for-sale debt securities, Fair value, 12 months or more	139,214	388,064
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	474	3,801
Available-for-sale debt securities, Fair value, Total	517,565	502,121
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 1,051	¥ 4,331
Available-for-sale debt securities, Number of securities | Securities	218	402
Held-to-maturity debt securities, Fair value, Less than 12 months		¥ 108,478
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months		1,033
Held-to-maturity debt securities, Fair value, 12 months or more		360,841
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more		1,979
Held-to-maturity debt securities, Fair value, Total		469,319
Held-to-maturity debt securities, Gross unrealized losses, Total		¥ 3,012
Held-to-maturity debt securities, Number of securities | Securities		281
Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 36,633	¥ 182,887
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	905	3,087
Available-for-sale debt securities, Fair value, 12 months or more	2,616	1,304
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	7	2
Available-for-sale debt securities, Fair value, Total	39,249	184,191
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 912	¥ 3,089
Available-for-sale debt securities, Number of securities | Securities	21	39
Held-to-maturity debt securities, Fair value, Less than 12 months		¥ 10,281
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months		32
Held-to-maturity debt securities, Fair value, 12 months or more		133,791
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more		285
Held-to-maturity debt securities, Fair value, Total		144,072
Held-to-maturity debt securities, Gross unrealized losses, Total		¥ 317
Held-to-maturity debt securities, Number of securities | Securities		31
Asset-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 190,795	¥ 189,775
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	394	503
Available-for-sale debt securities, Fair value, 12 months or more	49,428	86,605
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	256	620
Available-for-sale debt securities, Fair value, Total	240,223	276,380
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 650	¥ 1,123
Available-for-sale debt securities, Number of securities | Securities	89	94
Held-to-maturity debt securities, Fair value, Less than 12 months		¥ 637,201
Held-to-maturity debt securities, Gross unrealized losses, Less than 12 months		8,536
Held-to-maturity debt securities, Fair value, 12 months or more		1,259,720
Held-to-maturity debt securities, Gross unrealized losses, 12 months or more		19,180
Held-to-maturity debt securities, Fair value, Total		1,896,921
Held-to-maturity debt securities, Gross unrealized losses, Total		¥ 27,716
Held-to-maturity debt securities, Number of securities | Securities		77
Other Debt Securities [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 22,812	¥ 53,070
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	91	132
Available-for-sale debt securities, Fair value, 12 months or more	22,388	30,657
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	639	1,824
Available-for-sale debt securities, Fair value, Total	45,200	83,727
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 730	¥ 1,956
Available-for-sale debt securities, Number of securities | Securities	17	24
Commercial Paper [Member]
Investment Securities [Line Items]
Available-for-sale debt securities, Fair value, Less than 12 months	¥ 116,016
Available-for-sale debt securities, Gross unrealized losses, Less than 12 months	5
Available-for-sale debt securities, Fair value, 12 months or more	0
Available-for-sale debt securities, Gross unrealized losses, 12 months or more	0
Available-for-sale debt securities, Fair value, Total	116,016
Available-for-sale debt securities, Gross unrealized losses, Total	¥ 5
Available-for-sale debt securities, Number of securities | Securities	8

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) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Net gains (losses) recognized during the period	[1]	¥ 1,467,763	¥ (639,813)	¥ (278,746)
Net gains (losses) recognized during the period on equity securities sold during the period		47,775	(37,541)	(3,303)
Net unrealized gains (losses) recognized during the reporting period still held at the reporting date		¥ 1,419,988	¥ (602,272)	¥ (275,443)
[1]	Included in Investment securities gains (losses)—net.

Investment Securities (Carrying

Investment Securities (Carrying Value of Nonmarketable Equity Securities) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Nonmarketable Equity Securities [Member] | Measurement Alternative [Member]
Investment Securities [Line Items]
Balance	¥ 356,074	¥ 534,882

Investment Securities (Related

Investment Securities (Related Adjustments for Nonmarketable Equity Securities) (Detail) - Nonmarketable Equity Securities [Member] - Measurement Alternative [Member] - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Investment Securities [Line Items]
Impairment losses	[1],[2]	¥ (5,188)	¥ (3,099)	¥ (2,292)
Downward changes for observable prices	[1],[3],[4],[5]		(953)
Upward changes for observable prices	[1],[3],[5],[6]	21,710	6,223	¥ 53,077
Cumulative impairment losses		10,102	5,007
Cumulative downward changes for observable prices		953	953
Cumulative upward changes for observable prices		¥ 54,806	¥ 34,466
[1]	Included in Investment securities gains (losses)—net.
[2]	The cumulative impairment losses at March 31, 2020 and 2021 were ¥5,007 million and ¥10,102 million, respectively.
[3]	The MUFG Group applied measurement alternative downward or upward changes to certain nonmarketable equity securities, resulting from observable prices in orderly transactions, such as partial repurchase and transactions by other entities.
[4]	The cumulative downward changes for observable prices at March 31, 2020 and 2021 were ¥953 million and ¥953 million, respectively.
[5]	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.
[6]	The cumulative upward changes for observable prices at March 31, 2020 and 2021 were ¥34,466 million and ¥54,806 million, respectively.

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses (Narrative) (Detail) - JPY (¥) ¥ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Commitments to extend credit to customers with TDRs	¥ 130,788	¥ 90,097		¥ 130,788	¥ 90,097
Decrease in net income attributable to Mitsubishi UFJ Financial Group not recognized for the fiscal year	157,320	(164,480)	¥ 19,970
Foreign Subsidiaries [Member] | Covid 19 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Effect of recording a provision for credit losses and a provision for off-balance sheet credit instruments, not recognized for the fiscal year	10,000	84,000
Decrease in net income attributable to Mitsubishi UFJ Financial Group not recognized for the fiscal year	¥ (5,000)	¥ (58,000)
Nonperforming Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Decrease from charge-offs in the allowance for credit losses due to loan disposal activity				¥ 16,800	19,400
Increase from recoveries in the allowance for credit losses due to loan disposal activity						¥ 15,100
Close Watch [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing loans contractually past due, in day				90 days
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal borrower ratings				1 through 15
Significant sales of loans				¥ 1,684,000	¥ 2,136,000	¥ 1,769,000
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
Commercial [Member] | Normal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal borrower ratings				1 through 9
Commercial [Member] | Close Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal borrower ratings				10 through 12
Commercial [Member] | Close Watch [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing loans contractually past due, in day				90 days
Commercial [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal borrower ratings				13 through 15
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
MUFG [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Significant sales of loans				¥ 586,000
MUFG [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
Krungsri [Member] | Minimum [Member] | Under-Performing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Cumulative period of loans for categorizing internal borrower ratings, commencing from the contractual due date, in day				30 days
Krungsri [Member] | Minimum [Member] | Non-Performing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Cumulative period of loans for categorizing internal borrower ratings, commencing from the contractual due date, in day				90 days

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		Mar. 31, 2021	Mar. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Unearned income, unamortized premiums-net and deferred loan fees-net		¥ (308,882)	¥ (350,287)
Total Loans, net	[1]	115,718,863	118,186,739
Loans held for sale		353,095	344,790
Domestic [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		68,326,402	65,053,362
Domestic [Member] | Manufacturing [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		13,133,360	11,448,778
Domestic [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		763,958	733,212
Domestic [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		11,997,301	12,054,671
Domestic [Member] | Services [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		2,908,975	2,585,111
Domestic [Member] | Wholesale and Retail [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		7,766,070	7,504,561
Domestic [Member] | Banks and Other Financial Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	[2]	6,443,296	5,161,093
Domestic [Member] | Communication and Information Services [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		1,407,738	1,572,344
Domestic [Member] | Other Industries [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		8,838,718	8,673,871
Domestic [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		15,066,986	15,319,721
Foreign [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		47,701,343	53,483,664
Total Loans, net		47,333,878	53,079,542
Foreign [Member] | Governments and Official Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		655,367	726,347
Foreign [Member] | Banks and Other Financial Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	[2]	10,649,029	11,788,225
Foreign [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		29,574,176	32,565,030
Foreign [Member] | Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		¥ 6,822,771	¥ 8,404,062
[1]	The above table includes loans held for sale of ¥344,790 million and ¥353,095 million at March 31, 2020 and 2021, 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		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	¥ 1,213,841	¥ 778,469
Nonaccrual loans not requiring an allowance for credit losses	[2]	246,007
Recognized interest income		21,247
Loans held for sale placed on nonaccrual status		8,562	330
Loans acquired with deteriorated credit quality placed on nonaccrual status			25,427
Commercial [Member] | Domestic [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	565,671	312,972
Nonaccrual loans not requiring an allowance for credit losses	[2]	111,141
Recognized interest income		4,355
Commercial [Member] | Foreign [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	258,391	127,001
Nonaccrual loans not requiring an allowance for credit losses	[2]	96,833
Recognized interest income		5,110
Residential [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	67,968	63,998
Nonaccrual loans not requiring an allowance for credit losses	[2]	4,720
Recognized interest income		923
Card [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	60,200	61,172
Recognized interest income		37
MUAH [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	73,706	35,840
Nonaccrual loans not requiring an allowance for credit losses	[2]	30,242
Recognized interest income		1,057
Krungsri [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	161,338	149,732
Nonaccrual loans not requiring an allowance for credit losses	[2]	3,042
Recognized interest income		5,562
Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans	[1]	26,567	¥ 27,754
Nonaccrual loans not requiring an allowance for credit losses	[2]	29
Recognized interest income		¥ 4,203
[1]	Nonaccrual loans in the above table do not include loans held for sale of ¥330 million and ¥8,562 million at March 31, 2020 and 2021, respectively, and do not include loans acquired with deteriorated credit quality of ¥25,427 million at March 31, 2020.
[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, or the fair value of the collateral if the loan is a collateral-dependent loan.

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses (Impaired Loans by Class) (Detail) ¥ in Millions	Mar. 31, 2020JPY (¥)
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	¥ 1,031,614	[1]
Recorded loan balance, Not requiring an allowance for credit losses	275,215	[1],[2]
Recorded loan balance, Total	1,306,829	[1]
Unpaid principal balance	1,421,964	[1]
Related allowance for credit losses	443,742	[1]
Impaired loans held for sales	330
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	12,906
Recorded loan balance, Total	12,906
Unpaid principal balance	19,947
Related allowance for credit losses	4,767
Commercial [Member] | Domestic [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	598,737
Recorded loan balance, Not requiring an allowance for credit losses	147,890	[2]
Recorded loan balance, Total	746,627
Unpaid principal balance	784,298
Related allowance for credit losses	268,070
Commercial [Member] | Foreign [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	141,897
Recorded loan balance, Not requiring an allowance for credit losses	56,464	[2]
Recorded loan balance, Total	198,361
Unpaid principal balance	220,283
Related allowance for credit losses	96,009
Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	88,075	[3]
Recorded loan balance, Not requiring an allowance for credit losses	4,822	[2],[3]
Recorded loan balance, Total	92,897	[3]
Unpaid principal balance	107,629	[3]
Related allowance for credit losses	12,770	[3]
Card [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	65,240	[3]
Recorded loan balance, Not requiring an allowance for credit losses	280	[2],[3]
Recorded loan balance, Total	65,520	[3]
Unpaid principal balance	72,714	[3]
Related allowance for credit losses	19,799	[3]
MUAH [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	33,884	[3]
Recorded loan balance, Not requiring an allowance for credit losses	33,835	[2],[3]
Recorded loan balance, Total	67,719	[3]
Unpaid principal balance	84,737	[3]
Related allowance for credit losses	5,977	[3]
Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	68,126	[3]
Recorded loan balance, Not requiring an allowance for credit losses	30,833	[2],[3]
Recorded loan balance, Total	98,959	[3]
Unpaid principal balance	106,265	[3]
Related allowance for credit losses	30,198	[3]
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	22,749	[3]
Recorded loan balance, Not requiring an allowance for credit losses	1,091	[2],[3]
Recorded loan balance, Total	23,840	[3]
Unpaid principal balance	26,091	[3]
Related allowance for credit losses	¥ 6,152	[3]
[1]	In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥330 million at March 31, 2020.
[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]	Impaired Loans for Residential, Card, MUAH, Krungsri and Other segments in the above table include loans acquired with deteriorated credit quality.

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	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	¥ 1,260,791	¥ 1,262,339
Recognized interest income	22,871	26,213
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	9,395	7,814
Recognized interest income	74	182
Commercial [Member] | Domestic [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	726,794	766,847
Recognized interest income	8,722	12,383
Commercial [Member] | Foreign [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	174,831	159,999
Recognized interest income	3,013	3,127
Residential [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	98,238	107,165
Recognized interest income	1,252	1,620
Card [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	65,270	66,187
Recognized interest income	1,241	1,614
MUAH [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	82,832	71,162
Recognized interest income	2,801	2,292
Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	91,577	83,165
Recognized interest income	5,274	¥ 4,995
Other [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	11,854
Recognized interest income	¥ 494

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses (Troubled Debt Restructurings by Class) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment		¥ 178,416	¥ 217,911	¥ 113,728
Troubled debt restructurings, Post-modification outstanding recorded investment		177,246	216,599	112,818
Troubled debt restructurings that subsequently defaulted, Recorded Investment		39,450	26,521	23,081
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]		10,786	50
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]		10,786	50
Commercial [Member] | Domestic [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	39,282	61,735	36,693
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	39,282	61,735	36,693
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	16,179	8,857	11,002
Commercial [Member] | Foreign [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	33,839	39,827	5,692
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	33,839	39,827	5,692
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	9,861	2,337
Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	18,121	5,137	7,379
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	18,121	5,137	7,379
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	157	31	362
Card [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	20,857	22,625	19,685
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	19,737	21,561	18,837
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	2,733	3,320	3,442
MUAH [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	22,801	33,782	19,837
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	22,763	33,564	19,837
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	3,437	4,656	349
Krungsri [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	18,548	31,238	24,392
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	18,548	31,209	24,330
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	6,226	7,305	7,926
Other [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	24,968	12,781
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	24,956	12,780
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	¥ 857	¥ 15
[1]	For the fiscal year ended March 31, 2019, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment and forbearance was the primary concession type in the MUFG Americas Holdings segment. For the fiscal year ended March 31, 2020, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUFG Americas Holdings and Krungsri segments and reduction in the stated rate was the primary concession type in the Card and Other segments. For the fiscal year ended March 31, 2021, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segment and forbearance was the primary concession type in the MUFG Americas Holdings 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, Krungsri and Other segments include accrual and nonaccrual loans.

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses (Credit Quality Indicators of Loans by Class) (Detail) ¥ in Millions	Mar. 31, 2020JPY (¥)
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	¥ 86,622,787	[1]
Commercial [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	84,423,185
Commercial [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	1,832,306
Commercial [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	367,296
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	36,972	[1]
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	8,255
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	9,739
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	18,978
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	51,102,178	[1]
Commercial [Member] | Domestic [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	49,695,889
Commercial [Member] | Domestic [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	1,186,044
Commercial [Member] | Domestic [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	220,245
Commercial [Member] | Foreign [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	35,483,637	[1]
Commercial [Member] | Foreign [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	34,719,041
Commercial [Member] | Foreign [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	636,523
Commercial [Member] | Foreign [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	128,073
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	13,318,490	[1]
Residential [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	13,256,744
Residential [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	61,746
Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	565,643	[1]
Card [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	504,357
Card [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	61,286
MUAH [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	9,655,468	[1],[2]
MUAH [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	4,590,805
MUAH [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	15,119
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	4,877,863
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	87,648
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	84,033
Krungsri [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	6,911,590	[1]
Krungsri [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	6,241,696
Krungsri [Member] | Under-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	508,847
Krungsri [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	161,047
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	1,117,893	[1]
Other [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	1,086,517
Other [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	¥ 31,376
[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 FDIC covered loans which are not individually rated totaling ¥365 million and nil as of March 31, 2020 and 2021, 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_10

Loans and Allowance for Credit Losses (Credit Quality Indicators of Loans and Year of Origination by Class) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
Commercial [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		¥ 29,805,641
Term loans amortized cost basis, 2019		10,256,709
Term loans amortized cost basis, 2018		9,410,172
Term loans amortized cost basis, 2017		5,360,221
Term loans amortized cost basis, 2016		4,736,515
Term loans amortized cost basis, Prior		6,945,092
Revolving loans amortized cost basis		19,401,336
Revolving loans converted to term loans amortized cost basis		9,776
Total	[1]	85,925,462
Commercial [Member] | Domestic [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		22,402,694
Term loans amortized cost basis, 2019		6,392,946
Term loans amortized cost basis, 2018		6,126,746
Term loans amortized cost basis, 2017		3,840,964
Term loans amortized cost basis, 2016		3,649,145
Term loans amortized cost basis, Prior		5,286,408
Revolving loans amortized cost basis		6,934,308
Total	[1]	54,633,211
Commercial [Member] | Domestic [Member] | Normal [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		21,936,776
Term loans amortized cost basis, 2019		6,058,126
Term loans amortized cost basis, 2018		5,915,318
Term loans amortized cost basis, 2017		3,666,734
Term loans amortized cost basis, 2016		3,551,332
Term loans amortized cost basis, Prior		4,847,597
Revolving loans amortized cost basis		6,604,586
Total	[1]	52,580,469
Commercial [Member] | Domestic [Member] | Close Watch [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		431,223
Term loans amortized cost basis, 2019		319,073
Term loans amortized cost basis, 2018		195,630
Term loans amortized cost basis, 2017		162,176
Term loans amortized cost basis, 2016		74,698
Term loans amortized cost basis, Prior		317,622
Revolving loans amortized cost basis		306,236
Total	[1]	1,806,658
Commercial [Member] | Domestic [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		34,695
Term loans amortized cost basis, 2019		15,747
Term loans amortized cost basis, 2018		15,798
Term loans amortized cost basis, 2017		12,054
Term loans amortized cost basis, 2016		23,115
Term loans amortized cost basis, Prior		121,189
Revolving loans amortized cost basis		23,486
Total	[1]	246,084
Commercial [Member] | Foreign [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		7,402,947
Term loans amortized cost basis, 2019		3,863,763
Term loans amortized cost basis, 2018		3,283,426
Term loans amortized cost basis, 2017		1,519,257
Term loans amortized cost basis, 2016		1,087,370
Term loans amortized cost basis, Prior		1,658,684
Revolving loans amortized cost basis		12,467,028
Revolving loans converted to term loans amortized cost basis		9,776
Total	[1]	31,292,251
Commercial [Member] | Foreign [Member] | Normal [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		7,158,793
Term loans amortized cost basis, 2019		3,704,240
Term loans amortized cost basis, 2018		3,155,261
Term loans amortized cost basis, 2017		1,423,064
Term loans amortized cost basis, 2016		1,032,052
Term loans amortized cost basis, Prior		1,534,943
Revolving loans amortized cost basis		12,231,018
Revolving loans converted to term loans amortized cost basis		9,776
Total	[1]	30,249,147
Commercial [Member] | Foreign [Member] | Close Watch [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		200,305
Term loans amortized cost basis, 2019		118,027
Term loans amortized cost basis, 2018		91,867
Term loans amortized cost basis, 2017		60,422
Term loans amortized cost basis, 2016		51,433
Term loans amortized cost basis, Prior		69,436
Revolving loans amortized cost basis		197,405
Total	[1]	788,895
Commercial [Member] | Foreign [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		43,849
Term loans amortized cost basis, 2019		41,496
Term loans amortized cost basis, 2018		36,298
Term loans amortized cost basis, 2017		35,771
Term loans amortized cost basis, 2016		3,885
Term loans amortized cost basis, Prior		54,305
Revolving loans amortized cost basis		38,605
Total	[1]	254,209
Residential [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		623,328
Term loans amortized cost basis, 2019		847,314
Term loans amortized cost basis, 2018		822,883
Term loans amortized cost basis, 2017		892,166
Term loans amortized cost basis, 2016		1,304,110
Term loans amortized cost basis, Prior		8,660,022
Revolving loans amortized cost basis		32,984
Revolving loans converted to term loans amortized cost basis		8
Total	[1]	13,182,815
Residential [Member] | Accrual [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		623,035
Term loans amortized cost basis, 2019		846,787
Term loans amortized cost basis, 2018		822,411
Term loans amortized cost basis, 2017		891,407
Term loans amortized cost basis, 2016		1,302,427
Term loans amortized cost basis, Prior		8,599,621
Revolving loans amortized cost basis		30,897
Total	[1]	13,116,585
Residential [Member] | Nonaccrual [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		293
Term loans amortized cost basis, 2019		527
Term loans amortized cost basis, 2018		472
Term loans amortized cost basis, 2017		759
Term loans amortized cost basis, 2016		1,683
Term loans amortized cost basis, Prior		60,401
Revolving loans amortized cost basis		2,087
Revolving loans converted to term loans amortized cost basis		8
Total	[1]	66,230
Card [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		14
Term loans amortized cost basis, 2019		96
Term loans amortized cost basis, 2018		171
Term loans amortized cost basis, 2017		304
Term loans amortized cost basis, 2016		110
Term loans amortized cost basis, Prior		513
Revolving loans amortized cost basis		417,804
Revolving loans converted to term loans amortized cost basis		60,284
Total	[1]	479,296
Card [Member] | Accrual [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		1
Term loans amortized cost basis, 2019		10
Term loans amortized cost basis, 2018		13
Term loans amortized cost basis, 2017		19
Term loans amortized cost basis, 2016		7
Term loans amortized cost basis, Prior		79
Revolving loans amortized cost basis		404,301
Revolving loans converted to term loans amortized cost basis		14,666
Total	[1]	419,096
Card [Member] | Nonaccrual [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		13
Term loans amortized cost basis, 2019		86
Term loans amortized cost basis, 2018		158
Term loans amortized cost basis, 2017		285
Term loans amortized cost basis, 2016		103
Term loans amortized cost basis, Prior		434
Revolving loans amortized cost basis		13,503
Revolving loans converted to term loans amortized cost basis		45,618
Total	[1]	60,200
MUAH [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
FDIC covered loans acquired with deteriorated credit quality and small business loans which are not individually rated		0	¥ 365
MUAH [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020	[2]	1,406,996
Term loans amortized cost basis, 2019	[2]	1,366,930
Term loans amortized cost basis, 2018	[2]	915,570
Term loans amortized cost basis, 2017	[2]	861,742
Term loans amortized cost basis, 2016	[2]	770,568
Term loans amortized cost basis, Prior	[2]	1,291,561
Revolving loans amortized cost basis	[2]	1,882,377
Total	[1],[2]	8,495,744
MUAH [Member] | Accrual [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		472,892
Term loans amortized cost basis, 2019		608,580
Term loans amortized cost basis, 2018		324,369
Term loans amortized cost basis, 2017		552,380
Term loans amortized cost basis, 2016		516,051
Term loans amortized cost basis, Prior		656,087
Revolving loans amortized cost basis		130,514
Total	[1]	3,260,873
MUAH [Member] | Nonaccrual [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2019		725
Term loans amortized cost basis, 2018		518
Term loans amortized cost basis, 2017		1,139
Term loans amortized cost basis, 2016		1,035
Term loans amortized cost basis, Prior		14,801
Revolving loans amortized cost basis		828
Total	[1]	19,046
MUAH [Member] | Pass [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		920,959
Term loans amortized cost basis, 2019		707,841
Term loans amortized cost basis, 2018		486,354
Term loans amortized cost basis, 2017		287,316
Term loans amortized cost basis, 2016		236,715
Term loans amortized cost basis, Prior		542,634
Revolving loans amortized cost basis		1,625,799
Total	[1]	4,807,618
MUAH [Member] | Special Mention [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		4,865
Term loans amortized cost basis, 2019		31,361
Term loans amortized cost basis, 2018		49,784
Term loans amortized cost basis, 2017		14,904
Term loans amortized cost basis, 2016		9,522
Term loans amortized cost basis, Prior		30,015
Revolving loans amortized cost basis		76,487
Total	[1]	216,938
MUAH [Member] | Classified [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		8,280
Term loans amortized cost basis, 2019		18,423
Term loans amortized cost basis, 2018		54,545
Term loans amortized cost basis, 2017		6,003
Term loans amortized cost basis, 2016		7,245
Term loans amortized cost basis, Prior		48,024
Revolving loans amortized cost basis		48,749
Total	[1]	191,269
Krungsri [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		1,316,031
Term loans amortized cost basis, 2019		1,197,815
Term loans amortized cost basis, 2018		958,241
Term loans amortized cost basis, 2017		506,919
Term loans amortized cost basis, 2016		285,427
Term loans amortized cost basis, Prior		402,752
Revolving loans amortized cost basis		1,922,946
Revolving loans converted to term loans amortized cost basis		14,514
Total	[1]	6,604,645
Krungsri [Member] | Performing [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		1,251,246
Term loans amortized cost basis, 2019		1,086,710
Term loans amortized cost basis, 2018		855,915
Term loans amortized cost basis, 2017		434,818
Term loans amortized cost basis, 2016		241,811
Term loans amortized cost basis, Prior		314,114
Revolving loans amortized cost basis		1,754,840
Total	[1]	5,939,454
Krungsri [Member] | Under-Performing [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		52,821
Term loans amortized cost basis, 2019		85,408
Term loans amortized cost basis, 2018		74,848
Term loans amortized cost basis, 2017		57,314
Term loans amortized cost basis, 2016		31,886
Term loans amortized cost basis, Prior		57,129
Revolving loans amortized cost basis		144,447
Total	[1]	503,853
Krungsri [Member] | Non-Performing [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		11,964
Term loans amortized cost basis, 2019		25,697
Term loans amortized cost basis, 2018		27,478
Term loans amortized cost basis, 2017		14,787
Term loans amortized cost basis, 2016		11,730
Term loans amortized cost basis, Prior		31,509
Revolving loans amortized cost basis		23,659
Revolving loans converted to term loans amortized cost basis		14,514
Total	[1]	161,338
Other [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		338,342
Term loans amortized cost basis, 2019		164,650
Term loans amortized cost basis, 2018		84,115
Term loans amortized cost basis, 2017		37,394
Term loans amortized cost basis, 2016		11,030
Term loans amortized cost basis, Prior		8,538
Revolving loans amortized cost basis		342,619
Total	[1]	986,688
Other [Member] | Accrual [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		335,830
Term loans amortized cost basis, 2019		159,363
Term loans amortized cost basis, 2018		79,608
Term loans amortized cost basis, 2017		35,366
Term loans amortized cost basis, 2016		10,556
Term loans amortized cost basis, Prior		8,201
Revolving loans amortized cost basis		331,197
Total	[1]	960,121
Other [Member] | Nonaccrual [Member] | Excluding Loans Held For Sale And Covered Loans [Member]
Financing Receivables Credit Quality Indicator By Year Of Origination [Line Items]
Term loans amortized cost basis, 2020		2,512
Term loans amortized cost basis, 2019		5,287
Term loans amortized cost basis, 2018		4,507
Term loans amortized cost basis, 2017		2,028
Term loans amortized cost basis, 2016		474
Term loans amortized cost basis, Prior		337
Revolving loans amortized cost basis		11,422
Total	[1]	¥ 26,567
[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 FDIC covered loans which are not individually rated totaling ¥365 million and nil as of March 31, 2020 and 2021, 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_11

Loans and Allowance for Credit Losses (Ages of Past Due Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		¥ 530,901	¥ 553,956
Loans, current		115,143,749	117,571,069
Loans, excluding loans held for sale	[1]	115,674,650
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		118,125,025
Loans, greater than 90 days past due and accruing		20,540	13,273
1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		249,200	290,028
Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		281,701	263,928
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		27,759	36,186
Loans, current		54,605,452	51,065,992
Loans, excluding loans held for sale	[1]	54,633,211
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		51,102,178
Loans, greater than 90 days past due and accruing		4,673	4,720
Commercial [Member] | Domestic [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		4,763	9,215
Commercial [Member] | Domestic [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		22,996	26,971
Commercial [Member] | Foreign [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		29,775	33,475
Loans, current		31,262,476	35,450,162
Loans, excluding loans held for sale	[1]	31,292,251
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		35,483,637
Loans, greater than 90 days past due and accruing		91	164
Commercial [Member] | Foreign [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		7,302	9,927
Commercial [Member] | Foreign [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		22,473	23,548
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		67,952	63,847
Loans, current		13,114,863	13,248,278
Loans, excluding loans held for sale	[1]	13,182,815
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		13,312,125
Loans, greater than 90 days past due and accruing		11,150	6,288
Residential [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		39,577	48,404
Residential [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		28,375	15,443
Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		28,913	44,732
Loans, current		450,383	518,008
Loans, excluding loans held for sale	[1]	479,296
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		562,740
Loans, greater than 90 days past due and accruing
Card [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		2,127	14,735
Card [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		26,786	29,997
MUAH [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		71,419	45,487
Loans, current		8,424,325	9,603,339
Loans, excluding loans held for sale	[1]	8,495,744
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		9,648,826
Loans, greater than 90 days past due and accruing		4,626	2,101
MUAH [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		42,082	31,052
MUAH [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		29,337	14,435
Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		259,106	289,439
Loans, current		6,345,539	6,616,104
Loans, excluding loans held for sale	[1]	6,604,645
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		6,905,543
Loans, greater than 90 days past due and accruing
Krungsri [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		131,573	160,253
Krungsri [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		127,533	129,186
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		45,977	40,790
Loans, current		940,711	1,069,186
Loans, excluding loans held for sale	[1]	986,688
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1]		1,109,976
Loans, greater than 90 days past due and accruing
Other [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		21,776	16,442
Other [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		¥ 24,201	¥ 24,348
[1]	At March 31, 2020, 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. At March 31, 2021, 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.

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses (Changes in Allowance for Credit Losses by Portfolio Segment) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021		Mar. 31, 2020		Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		¥ 809,540	[1]	¥ 658,184		¥ 764,124
Provision for (reversal of) credit losses		484,210		321,713		34,330
Charge-offs		290,506		243,135		174,041
Recoveries collected		45,082		63,858		44,117
Net charge-offs		245,424		179,277		129,924
Other	[2]	(23,639)		8,920		(10,346)
Balance at end of fiscal year		1,348,391	[1]	809,540	[1]	658,184
Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	323,704
Balance at end of fiscal year	[3]			323,704
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		482,275		389,615		491,098
Provision for (reversal of) credit losses		235,584		153,782		(43,850)
Charge-offs		77,904		85,326		76,664
Recoveries collected		9,262		26,427		17,565
Net charge-offs		68,642		58,899		59,099
Other	[2]	1,532		(2,223)		1,466
Balance at end of fiscal year		734,577		482,275		389,615
Commercial [Member] | Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	83,828
Balance at end of fiscal year	[3]			83,828
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		34,746		38,626		42,546
Provision for (reversal of) credit losses		1,385		(1,028)		(4,480)
Charge-offs		2,745		3,227		274
Recoveries collected		13		375		834
Net charge-offs		2,732		2,852		(560)
Other	[2]			0		0
Balance at end of fiscal year		82,893		34,746		38,626
Residential [Member] | Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	49,494
Balance at end of fiscal year	[3]			49,494
Card [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		35,180		32,550		32,119
Provision for (reversal of) credit losses		17,876		26,542		23,809
Charge-offs		24,564		25,149		24,310
Recoveries collected		1,463		1,237		932
Net charge-offs		23,101		23,912		23,378
Other	[2]			0		0
Balance at end of fiscal year		44,217		35,180		32,550
Card [Member] | Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	14,262
Balance at end of fiscal year	[3]			14,262
MUAH [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		58,995		52,581		53,765
Provision for (reversal of) credit losses		90,064		30,825		9,277
Charge-offs		40,376		27,934		13,224
Recoveries collected		4,362		4,173		3,733
Net charge-offs		36,014		23,761		9,491
Other	[2]	(6,327)		(650)		(970)
Balance at end of fiscal year		131,755		58,995		52,581
MUAH [Member] | Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	25,037
Balance at end of fiscal year	[3]			25,037
Krungsri [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		169,626		144,812		144,596
Provision for (reversal of) credit losses		90,167		70,023		49,574
Charge-offs		93,192		77,907		59,569
Recoveries collected		23,415		23,170		21,053
Net charge-offs		69,777		54,737		38,516
Other	[2]	(14,953)		9,528		(10,842)
Balance at end of fiscal year		293,396		169,626		144,812
Krungsri [Member] | Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	118,333
Balance at end of fiscal year	[3]			118,333
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year		28,718
Provision for (reversal of) credit losses		49,134		41,569
Charge-offs		51,725		23,592
Recoveries collected		6,567		8,476
Net charge-offs		45,158		15,116
Other	[2]	(3,891)		2,265
Balance at end of fiscal year		61,553		28,718
Other [Member] | Effect of adopting new guidance [Member] | Measurement of credit losses on financial instruments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of fiscal year	[3]	¥ 32,750
Balance at end of fiscal year	[3]			¥ 32,750
[1]	New guidance on measurement of credit losses on financial instruments requires the allowance for credit losses to be measured using the current expected credit losses model from April 1, 2020. For additional information, refer to Note 1
[2]	Other is principally comprised of gains or losses from foreign exchange translation.
[3]	See Note 1 for more information.

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses (Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021		Mar. 31, 2020		Mar. 31, 2019	Mar. 31, 2018
Allowance for credit losses:
Individually evaluated for impairment				¥ 437,777
Collectively evaluated for impairment				359,579
Loans acquired with deteriorated credit quality	[1]			12,184
Total		¥ 1,348,391	[2]	809,540	[2]	¥ 658,184	¥ 764,124
Loans:
Individually evaluated for impairment				1,286,918
Collectively evaluated for impairment				116,838,107
Loans acquired with deteriorated credit quality	[1]			67,211
Total	[3]			118,192,236
Commercial [Member]
Allowance for credit losses:
Individually evaluated for impairment				364,079
Collectively evaluated for impairment				108,100
Loans acquired with deteriorated credit quality	[1]			10,096
Total		734,577		482,275		389,615	491,098
Loans:
Individually evaluated for impairment				944,988
Collectively evaluated for impairment				85,640,827
Loans acquired with deteriorated credit quality	[1]			36,972
Total	[3]			86,622,787
Residential [Member]
Allowance for credit losses:
Individually evaluated for impairment				12,651
Collectively evaluated for impairment				21,130
Loans acquired with deteriorated credit quality	[1]			965
Total		82,893		34,746		38,626	42,546
Loans:
Individually evaluated for impairment				92,448
Collectively evaluated for impairment				13,219,677
Loans acquired with deteriorated credit quality	[1]			6,365
Total	[3]			13,318,490
Card [Member]
Allowance for credit losses:
Individually evaluated for impairment				19,799
Collectively evaluated for impairment				15,369
Loans acquired with deteriorated credit quality	[1]			12
Total		44,217		35,180		32,550	32,119
Loans:
Individually evaluated for impairment				65,292
Collectively evaluated for impairment				497,448
Loans acquired with deteriorated credit quality	[1]			2,903
Total	[3]			565,643
MUAH [Member]
Allowance for credit losses:
Individually evaluated for impairment				5,977
Collectively evaluated for impairment				53,013
Loans acquired with deteriorated credit quality	[1]			5
Total		131,755		58,995		52,581	53,765
Loans:
Individually evaluated for impairment				67,719
Collectively evaluated for impairment				9,581,107
Loans acquired with deteriorated credit quality	[1]			7,007
Total	[3]			9,655,833
Krungsri [Member]
Allowance for credit losses:
Individually evaluated for impairment				30,198
Collectively evaluated for impairment				139,401
Loans acquired with deteriorated credit quality	[1]			27
Total		293,396		169,626		144,812	¥ 144,596
Loans:
Individually evaluated for impairment				98,959
Collectively evaluated for impairment				6,806,584
Loans acquired with deteriorated credit quality	[1]			6,047
Total	[3]			6,911,590
Other [Member]
Allowance for credit losses:
Individually evaluated for impairment				5,073
Collectively evaluated for impairment				22,566
Loans acquired with deteriorated credit quality	[1]			1,079
Total		¥ 61,553		28,718
Loans:
Individually evaluated for impairment				17,512
Collectively evaluated for impairment				1,092,464
Loans acquired with deteriorated credit quality	[1]			7,917
Total	[3]			¥ 1,117,893
[1]	Loans acquired with deteriorated credit quality in the above table include impaired loans which are individually evaluated for impairment.
[2]	New guidance on measurement of credit losses on financial instruments requires the allowance for credit losses to be measured using the current expected credit losses model from April 1, 2020. For additional information, refer to Note 1
[3]	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.

Premises and Equipment (Narrati

Premises and Equipment (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Impairment losses for long-lived assets	¥ 11,424	¥ 16,575	¥ 31,345
Impairment losses recognized for real estate held for sale	¥ 773	¥ 194	411
Consumer Finance Subsidiary [Member]
Property, Plant and Equipment [Line Items]
Impairment losses for long-lived assets			¥ 21,096

Premises and Equipment (Compone

Premises and Equipment (Components of Premises and Equipment) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Premises and equipment	¥ 2,058,851	¥ 2,133,071
Less accumulated depreciation	1,183,859	1,203,542
Premises and equipment-net	874,992	929,529
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	379,560	380,477
Buildings [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	765,341	782,367
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	564,273	623,676
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	303,164	310,957
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	¥ 46,513	¥ 35,594

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	¥ 147,564	¥ 383,810
Intangible assets subject to amortization acquired	255,336	538,925
Intangible assets not subject to amortization acquired	1,960	23,804
Impairment losses for intangible assets, whose carrying amounts exceeded their fair value	21,680	3,732	118,108
Impairment losses for long-lived assets	11,424	16,575	31,345
Software [Member]
Goodwill and Other Intangible Assets [Line Items]
Intangible assets subject to amortization acquired	¥ 251,452	¥ 291,821
Weighted average amortization periods of intangible assets subject to amortization, years	5 years	5 years
Impairment losses for intangible assets, whose carrying amounts exceeded their fair value			28,494
Core Deposit Intangibles [Member]
Goodwill and Other Intangible Assets [Line Items]
Intangible assets subject to amortization acquired		¥ 44,140
Weighted average amortization periods of intangible assets subject to amortization, years		10 years
Customer Relationships [Member]
Goodwill and Other Intangible Assets [Line Items]
Intangible assets subject to amortization acquired	¥ 3,765	¥ 180,414
Weighted average amortization periods of intangible assets subject to amortization, years	21 years	17 years
Trade Names [Member]
Goodwill and Other Intangible Assets [Line Items]
Intangible assets subject to amortization acquired		¥ 16,402
Weighted average amortization periods of intangible assets subject to amortization, years		23 years
System Software under Development [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses for intangible assets, whose carrying amounts exceeded their fair value			87,596
Consumer Finance Subsidiary [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses for long-lived assets			21,096
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	¥ 117,039	¥ 350,942
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member] | Danamon [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill		241,356
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member] | Krungsri [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill		62,157
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group and Global Corporate & Investment Banking Business Group [Member] | MUAH [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	¥ 147,564	¥ 80,297
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | Consumer Finance Subsidiary [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses for long-lived assets			21,096
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | Consumer Finance Subsidiary [Member] | Software [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses for intangible assets, whose carrying amounts exceeded their fair value			137,186
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | Danamon [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill			¥ 0

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Movement in Carrying Amount of Goodwill by Business Segment) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019		Apr. 01, 2017
Goodwill [Line Items]
Goodwill acquired during the fiscal year	[1]	¥ 5,269	¥ 473,500
Impairment loss		(147,564)	(383,810)
Foreign currency translation adjustments and other		(4,479)	(5,955)
Goodwill		1,094,344	1,093,554	626,009
Accumulated impairment losses		(723,492)	(575,928)	(192,118)	[2]
Goodwill, Net, at end of fiscal year		370,852	517,626	433,891
Goodwill, Fully impaired before April 1, 2017						¥ 1,900,019
Operating Segments [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member]
Goodwill [Line Items]
Goodwill acquired during the fiscal year	[1]	1,105	34,553
Impairment loss		(30,525)	(32,868)
Foreign currency translation adjustments and other		456	(1,354)
Goodwill		140,099	138,538	105,339
Accumulated impairment losses		(63,393)	(32,868)
Goodwill, Net, at end of fiscal year		76,706	105,670	105,339
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member]
Goodwill [Line Items]
Goodwill acquired during the fiscal year	[1]		260,639
Impairment loss		(117,039)	(350,942)
Foreign currency translation adjustments and other		(10,001)	(12,877)
Goodwill		728,644	738,645	490,883
Accumulated impairment losses		(645,731)	(528,692)	(177,750)	[2]
Goodwill, Net, at end of fiscal year		82,913	209,953	313,133
Operating Segments [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member]
Goodwill [Line Items]
Goodwill acquired during the fiscal year	[1]	4,164	178,308
Foreign currency translation adjustments and other		5,066	8,276
Goodwill		223,301	214,071	27,487
Accumulated impairment losses		(14,368)	(14,368)	(14,368)	[2]
Goodwill, Net, at end of fiscal year		208,933	199,703	13,119
Operating Segments [Member] | Global Markets Business Group [Member]
Goodwill [Line Items]
Goodwill		2,300	2,300	2,300
Goodwill, Net, at end of fiscal year		¥ 2,300	¥ 2,300	¥ 2,300
[1]	See Note 2 for the goodwill acquired in connection with acquisitions.
[2]	Effective April 1, 2018, the MUFG Group reorganized its business groups. Goodwill originally recognized for Retail Banking Business Group, Corporate Banking Business Group, Trust Assets Business Group and Global Business Group other than MUAH and Krungsri was ¥1,900,019 million, which has been fully impaired before April 1, 2017. As these impairment losses recorded in past before the reorganization of the segment and are irrelevant to the annual impairment test under the new segment, the accumulated impaired loss is not allocated to new business segments after the reorganization of business group.

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Carrying Amount of Other Intangible Assets by Major Class) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
Intangible assets subject to amortization:
Gross carrying amount		¥ 3,855,102	¥ 3,707,083
Accumulated amortization		2,690,208	2,505,117
Net carrying amount		1,164,894	1,201,966
Intangible assets not subject to amortization:
Net carrying amount, Other	[1]	20,100	37,560
Total intangible assets, Net carrying amount		1,184,994	1,239,526
Mortgage Servicing Rights [Member]
Intangible assets not subject to amortization:
Net carrying amount, Other		11,355	29,641
Software [Member]
Intangible assets subject to amortization:
Gross carrying amount		3,025,769	2,852,273
Accumulated amortization		2,249,340	2,096,635
Net carrying amount		776,429	755,638
Customer Relationships [Member]
Intangible assets subject to amortization:
Gross carrying amount		555,796	567,886
Accumulated amortization		290,641	264,636
Net carrying amount		265,155	303,250
Core Deposit Intangibles [Member]
Intangible assets subject to amortization:
Gross carrying amount		164,979	174,802
Accumulated amortization		102,958	100,022
Net carrying amount		62,021	74,780
Trade Names [Member]
Intangible assets subject to amortization:
Gross carrying amount		92,422	94,748
Accumulated amortization		41,629	38,055
Net carrying amount		50,793	56,693
Other [Member]
Intangible assets subject to amortization:
Gross carrying amount		16,136	17,374
Accumulated amortization		5,640	5,769
Net carrying amount		¥ 10,496	¥ 11,605
[1]	Intangible assets not subject to amortization includes ¥29,641 million and ¥11,355 million of mortgage servicing rights accounted for at fair value at March 31, 2020 and 2021, respectively.

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Estimated Aggregate Amortization Expense for Intangible Assets for Next Five Fiscal Years) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)
Estimated aggregate amortization expense for intangible assets for the next five fiscal years:
Fiscal year ending March 31, 2022	¥ 267,181
Fiscal year ending March 31, 2023	228,631
Fiscal year ending March 31, 2024	193,748
Fiscal year ending March 31, 2025	150,403
Fiscal year ending March 31, 2026	¥ 100,619

Lease Transactions (Narrative)

Lease Transactions (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Right-of-use assets of finance leases	¥ 15,218	¥ 18,497
Right-of-use assets of finance leases, in consolidated balance sheets line item	Premises and equipment—net (Notes 5 and 7)	Premises and equipment—net (Notes 5 and 7)
Lease liabilities of finance leases	¥ 20,137	¥ 25,186
Lease liabilities of finance leases, in consolidated balance sheets line item	Long-term debt (including ¥304,067 and ¥402,823 measured at fair value under the fair value option in 2020 and 2021) (Notes 7, 9, 12 and 31)	Long-term debt (including ¥304,067 and ¥402,823 measured at fair value under the fair value option in 2020 and 2021) (Notes 7, 9, 12 and 31)
Right-of-use assets of operating leases	¥ 338,547	¥ 393,435
Right-of-use assets of operating leases, in consolidated balance sheets line item	us-gaap:OtherAssets	us-gaap:OtherAssets
Lease liabilities of operating leases	¥ 476,104	¥ 482,813
Lease liabilities of operating leases, in consolidated balance sheets line item	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Operating Lease, Impairment Loss	¥ 56,424

Lease Transactions (Profit or L

Lease Transactions (Profit or Loss of Lease Transactions as a Lessee) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finance lease cost:
Amortization of right-of-use assets	¥ 4,971	¥ 5,455
Interest on lease liabilities	240	460
Operating lease cost	¥ 91,276	¥ 99,939

Lease Transactions (Information

Lease Transactions (Information of Lease Transactions as a Lessee) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	¥ 331	¥ 482
Operating cash flows from operating leases	102,982	106,103
Financing cash flows from finance leases	7,709	7,090
Right-of-use assets obtained in exchange for new finance lease liabilities	3,487	12,754	¥ 11,280
Right-of-use assets obtained in exchange for new operating lease liabilities	¥ 50,564	¥ 46,482
Weighted-average remaining lease term:
Finance leases	4 years 1 month 6 days	4 years 4 months 24 days
Operating leases	8 years 3 months 18 days	9 years 6 months
Weighted-average discount rate:
Finance leases	0.87%	0.99%
Operating leases	0.97%	1.16%

Lease Transactions (Maturities

Lease Transactions (Maturities of Lease Liabilities) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Undiscounted total lease payments: Finance leases, maturities in
2022	¥ 7,550
2023	5,397
2024	3,735
2025	1,585
2026	748
2027 and thereafter	2,090
Total undiscounted cash flows	21,105
Difference between undiscounted and discounted cash flows: Finance leases	(968)
Amount on balance sheet: Finance leases	20,137	¥ 25,186
Undiscounted total lease payments: Operating leases, maturities in
2022	106,423
2023	81,112
2024	60,525
2025	51,303
2026	41,089
2027 and thereafter	163,125
Total undiscounted cash flows	503,577
Difference between undiscounted and discounted cash flows: Operating leases	(27,473)
Amount on balance sheet: Operating leases	¥ 476,104	¥ 482,813

Lease Transactions (Profit or_2

Lease Transactions (Profit or Loss of Lease Transactions as a Lessor) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Sales type and direct financing leases:
Finance income on net investment	¥ 122,810	¥ 119,010
Operating leases:
Lease income	3,663	7,856
Total	¥ 126,473	¥ 126,866

Lease Transactions (Component o

Lease Transactions (Component of Sales Type and Direct Financing Lease Transactions) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Lease receivables (undiscounted)	¥ 1,913,852	¥ 2,193,360
Adjustments:
Discounted unguaranteed residual value	15,435	15,515
Initial direct cost on sales type and direct financing leases	27,869	29,562
Deferred selling profit	(313,784)	(364,206)
Net investment in sales type and direct financing leases	¥ 1,643,372	¥ 1,874,231

Lease Transactions (Maturity of

Lease Transactions (Maturity of the Lease Payment Receivables of Sales Type and Direct Financing Lease Transactions) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Lease receivables: Sales type and direct financing lease, maturities in
2022	¥ 460,067
2023	417,653
2024	352,767
2025	270,563
2026	188,168
2027 and thereafter	224,634
Total undiscounted cash flows	1,913,852	¥ 2,193,360
Difference between undiscounted cash flows and the lease receivables recognized on balance sheet	(270,480)
Amount on balance sheet	¥ 1,643,372

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Taxes [Line Items]
Approximate effective statutory rate of corporate income tax	30.60%	30.60%	30.60%
Undistributed earnings of foreign subsidiaries	¥ 105,934	¥ 67,791
Operating loss carryforwards	213,108
Tax credit carryforwards	¥ 62,184
Requirements of Japanese Tax Law for Domestic Company to Exclude from Taxable Income Dividend Received from Foreign Company [Member]
Income Taxes [Line Items]
Percentage of dividend that can be excluded from the taxable income	95.00%
Percentage of taxable dividends over the amount received from certain foreign subsidiaries	5.00%
Requirements of Japanese Tax Law for Domestic Company to Exclude from Taxable Income Dividend Received from Foreign Company [Member] | Minimum [Member]
Income Taxes [Line Items]
Percentage of outstanding shares held in a foreign company who declared a dividend	25.00%
Continuous holding period on the date the dividend is declared by a foreign company	6 months

Income Taxes (Income before Inc

Income Taxes (Income before Income Tax Expense by Jurisdiction) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Taxes [Line Items]
Income (loss) before income tax expense (benefit)	¥ 1,608,342	¥ 433,220	¥ 870,842
Domestic Income [Member]
Income Taxes [Line Items]
Income (loss) before income tax expense (benefit)	575,101	89,440	228,018
Foreign Income [Member]
Income Taxes [Line Items]
Income (loss) before income tax expense (benefit)	¥ 1,033,241	¥ 343,780	¥ 642,824

Income Taxes (Detail of Current

Income Taxes (Detail of Current and Deferred Income Tax Expense (Benefit)) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Current:
Domestic	¥ 95,183	¥ 28,128	¥ 57,303
Foreign	83,492	147,344	123,730
Total	178,675	175,472	181,033
Deferred:
Domestic	310,490	(18,949)	(32,746)
Foreign	(44,217)	(42,018)	(15,050)
Total	266,273	(60,967)	(47,796)
Income tax expense	444,948	114,505	133,237
Income tax expense (benefit) reported in Accumulated OCI relating to:
Investment securities	1,146	(29,747)	15,590
Debt valuation adjustments	(36,792)	23,908	4,293
Derivatives qualifying for cash flow hedges	12,244	4,012	(1,845)
Defined benefit plans	139,883	(57,685)	(38,229)
Foreign currency translation adjustments	(3,368)	(20,693)	15,148
Total	113,113	(80,205)	(5,043)
Total, Income tax expense (benefit)	¥ 558,061	¥ 34,300	¥ 128,194

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Effective Income Tax Rates) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020		Mar. 31, 2019
Reconciliation of effective income tax rate:
Combined normal effective statutory tax rate	30.60%	30.60%		30.60%
Nondeductible expenses	0.30%	1.20%		0.50%
Impairment of goodwill	2.40%	26.10%
Foreign tax credit and payments	(0.90%)	(9.20%)		(3.30%)
Lower tax rates applicable to income of subsidiaries	(1.00%)	(3.20%)		(2.50%)
Change in valuation allowance	(0.90%)	7.90%		(1.40%)
Realization of previously unrecognized tax effects of subsidiaries	0.00%	(19.80%)	[1]
Nontaxable dividends received	(1.90%)	(15.60%)		(9.10%)
Undistributed earnings of subsidiaries	0.00%	3.60%		0.60%
Tax and interest expense for uncertainty in income taxes	(0.10%)	0.00%		0.60%
Noncontrolling interest income (loss)	0.10%	(0.10%)		0.20%
Effect of changes in tax laws	(0.10%)			0.00%
Expiration of loss carryforward	0.10%	1.90%		0.10%
Other—net	(0.90%)	3.00%		(1.00%)
Effective income tax rate	27.70%	26.40%		15.30%
Realization of tax benefits that were not previously recognized as deferred tax assets		¥ 85,588
[1]	In October 2019, a wholly owned subsidiary of the MUFG Group was sold. The sale resulted in the realization of tax benefits that were not previously recognized as deferred tax assets, resulting in a ¥85,588 million reduction of income tax expense and a 19.8% reduction in the effective tax rate for the fiscal year ended March 31, 2020.

Income Taxes (Components of Net

Income Taxes (Components of Net Deferred Tax Assets) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Deferred tax assets:
Allowance for credit losses	¥ 462,369	¥ 317,770
Operating loss carryforwards	97,844	94,326
Loans	790	2,022
Accrued liabilities and other	300,942	277,807
Premises and equipment	117,322	150,116
Derivative financial instruments	69,039	96,761
Defined benefit plans		57,836
Obligations under operating leases	132,443	133,812
Valuation allowance	(137,503)	(151,530)
Total deferred tax assets	1,043,246	978,920
Deferred tax liabilities:
Investment securities (including trading account assets at fair value under the fair value option)	1,017,131	788,614
Intangible assets	70,575	87,063
Lease transactions	48,519	54,349
Defined benefit plans	81,282
Investments in subsidiaries and affiliates	338,713	279,583
Right-of-use assets of operating leases	100,260	106,995
Other	92,306	90,653
Total deferred tax liabilities	1,748,786	1,407,257
Net deferred tax assets (liabilities)	¥ (705,540)	¥ (428,337)

Income Taxes (Operating Loss an

Income Taxes (Operating Loss and Tax Credit Carryforwards) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	¥ 213,108
Tax credit carryforwards	62,184
Fiscal Year Ending March 31, 2022 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	15,457
Tax credit carryforwards	650
Fiscal Year Ending March 31, 2023 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	5,575
Tax credit carryforwards	8,191
Fiscal Year Ending March 31, 2024 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	5,209
Tax credit carryforwards	6,705
Fiscal Year Ending March 31, 2025 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	84,080
Tax credit carryforwards	10
Fiscal Year Ending March 31, 2026 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	59,047
Tax credit carryforwards	37
Fiscal Year Ending March 31, 2027 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	1,722
Tax credit carryforwards	70
Fiscal Year Ending March 31, 2027 and thereafter [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	17,288
Tax credit carryforwards	41,756
No Definite Expiration Date [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	24,730
Tax credit carryforwards	¥ 4,765

Income Taxes (Roll-forward of U

Income Taxes (Roll-forward of Unrecognized Tax Benefits) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Roll-forward of unrecognized tax benefits:
Balance at beginning of fiscal year	¥ 19,249	¥ 19,160	¥ 12,917
Gross amount of increases for current year's tax positions	202	399	313
Gross amount of decreases for current year's tax positions	(1,919)
Gross amount of increases for prior years' tax positions	489	212	8,836
Gross amount of decreases for prior years' tax positions	(2,329)		(1,090)
Net amount of changes relating to settlements with tax authorities		(81)
Decreases due to lapse of applicable statutes of limitations	(116)	(297)	(1,540)
Foreign exchange translation and other	(1,747)	(144)	(276)
Balance at end of fiscal year	¥ 13,829	¥ 19,249	¥ 19,160

Income Taxes (Roll-forward of I

Income Taxes (Roll-forward of Interest and Penalties Recognized) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Balance at beginning of fiscal year	¥ 2,612	¥ 3,056	¥ 4,564
Total interest and penalties in the consolidated statements of income	(398)	(398)	(1,655)
Total cash settlements, foreign exchange translation and other	203	(46)	147
Balance at end of fiscal year	¥ 2,417	¥ 2,612	¥ 3,056

Income Taxes (Status of Years u

Income Taxes (Status of Years under Audit or Open to Examination by Major Tax Jurisdictions) (Detail)	12 Months Ended
	Mar. 31, 2021
Japan [Member]
Income Tax Contingency [Line Items]
Status of tax years under audit or open to examination	2020 and forward
United States—Federal [Member]
Income Tax Contingency [Line Items]
Status of tax years under audit or open to examination	2017 and forward
United States—California [Member]
Income Tax Contingency [Line Items]
Status of tax years under audit or open to examination	2015 and forward
Indonesia [Member]
Income Tax Contingency [Line Items]
Status of tax years under audit or open to examination	2017 and forward

Pledged Assets and Collateral (

Pledged Assets and Collateral (Narrative) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Financial Instruments Pledged as Collateral [Abstract]
Investment securities pledged for acting as a collection agent of public funds	¥ 20,818,106
Reserve funds included in Cash and due from banks and Interest-earning deposits in other banks	2,881,778	¥ 2,606,464
Pledged assets that may not be sold or repledged by secured parties	47,853,000
Fair value of securities accepted as collateral that is permitted to be sold or repledged	30,983,000	38,858,000
Fair value of securities accepted as collateral that was sold or repledged	23,478,000	32,095,000
Cash collateral pledged for derivative transactions included in Other assets	2,005,136	1,696,108
Cash collateral received for derivative transactions included in Other liabilities	¥ 909,641	¥ 1,125,305

Pledged Assets and Collateral_3

Pledged Assets and Collateral (Assets Mortgaged, Pledged, or Otherwise Subject to Lien) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 42,531,106
Trading Account Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	9,966,574
Investment Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	20,250,998
Loans [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	12,289,789
Other [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 23,745

Pledged Assets and Collateral_4

Pledged Assets and Collateral (Pledged Assets Classified by Type of Liabilities) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 42,531,106
Deposits [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	138,491
Payables under Repurchase Agreements and Securities Lending Transactions [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	13,118,547
Other Short-term Borrowings and Long-term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	29,243,996
Other [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 30,072

Deposits (Narrative) (Detail)

Deposits (Narrative) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)	Mar. 31, 2021USD ($)	Mar. 31, 2020JPY (¥)	Mar. 31, 2020USD ($)
Deposits [Line Items]
Time deposits, including certificates of deposits ("CDs"), issued in amount of JPY10 million or more, Domestic deposits	¥ 25,219,926		¥ 23,957,076
Foreign [Member]
Deposits [Line Items]
Time deposits, including certificates of deposits ("CDs"), issued in amount of U.S.$100,000 or more, Foreign deposits	23,673,512		¥ 23,329,855
Minimum [Member]
Deposits [Line Items]
Issue amount of domestic time deposits in Japanese Yen	¥ 10
U.S.$ equivalent of JPY10 million based on Federal Reserve Bank of New York's noon buying rate | $		$ 90,000
Issue amount of foreign time deposits in U.S. dollars | $				$ 100,000

Deposits (Time Deposits by Matu

Deposits (Time Deposits by Maturity) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)
Domestic [Member]
Maturities of time deposits:
Due in one year or less	¥ 32,811,126
Due after one year through two years	4,345,312
Due after two years through three years	2,454,117
Due after three years through four years	610,596
Due after four years through five years	668,397
Due after five years	757,934
Total	41,647,482
Foreign [Member]
Maturities of time deposits:
Due in one year or less	23,871,425
Due after one year through two years	460,277
Due after two years through three years	204,050
Due after three years through four years	109,874
Due after four years through five years	31,178
Due after five years	68,309
Total	¥ 24,745,113

Call Money and Funds Purchase_3

Call Money and Funds Purchased (Summary of Funds Transactions) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Call Money and Funds Purchased Transactions [Line Items]
Outstanding at end of fiscal year, Amount	¥ 2,353,830	¥ 3,668,922
Outstanding at end of fiscal year, Weighted average interest rate	0.04%	0.04%
Minimum [Member]
Call Money and Funds Purchased Transactions [Line Items]
Outstanding at end of fiscal year, Principal range of maturities	1 day	1 day
Maximum [Member]
Call Money and Funds Purchased Transactions [Line Items]
Outstanding at end of fiscal year, Principal range of maturities	30 days	30 days

Due to Trust Account, Short-t_3

Due to Trust Account, Short-term Borrowings and Long-term Debt (Narrative) (Detail) € in Millions, ¥ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021JPY (¥)	Mar. 31, 2021USD ($)	Mar. 31, 2021EUR (€)	Mar. 31, 2020JPY (¥)
Debt Instrument [Line Items]
Unused lines of credit for financing	¥ 4,408,245			¥ 7,519,582
Aggregated principal amount of long term debt issued	¥ 498,195	$ 4,500	€ 500
Minimum TLAC ratio, required by March 31, 2021, over risk weighted assets	16.00%
Minimum TLAC ratio, required by March 31, 2021, over leverage ratio denominator	6.00%
Minimum TLAC ratio, required by March 31, 2022, over risk weighted assets	18.00%
Minimum TLAC ratio, required by March 31, 2022, over leverage ratio denominator	6.75%
Bonds for TLAC [Member] | Euro
Debt Instrument [Line Items]
Aggregated principal amount of long term debt issued	¥ 64,900
Basel III [Member]
Debt Instrument [Line Items]
Floor of Common Equity Tier 1 ratio, which leads the Group's discretion over unsecured perpetual subordinated Additional Tier 1 notes	5.125%
Basel III [Member] | Unsecured Perpetual Subordinated Additional Tier 1 Notes [Member]
Debt Instrument [Line Items]
Aggregated principal amount of long term debt issued	¥ 60,000

Due to Trust Account, Short-t_4

Due to Trust Account, Short-term Borrowings and Long-term Debt (Summary of Due to Trust Account Transactions) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Debt Disclosure [Abstract]
Amount outstanding at end of fiscal year	¥ 3,891,831	¥ 3,377,747
Weighted average interest rate on outstanding balance at end of fiscal year	0.00%	0.00%

Due to Trust Account, Short-t_5

Due to Trust Account, Short-term Borrowings and Long-term Debt (Components of Other Short-term Borrowings) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Short-term Debt [Line Items]
Other short-term borrowings	¥ 14,187,760	¥ 16,056,193
Less unamortized discount	37	711
Other short-term borrowings—net	¥ 14,187,723	¥ 16,055,482
Weighted average interest rate on outstanding balance at end of fiscal year	0.06%	0.67%
Domestic [Member]
Short-term Debt [Line Items]
Other short-term borrowings	¥ 10,712,939	¥ 11,323,055
Domestic [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Other short-term borrowings	1,207,610	1,160,758
Domestic [Member] | Borrowings from Bank of Japan [Member]
Short-term Debt [Line Items]
Other short-term borrowings	9,238,209	9,800,800
Domestic [Member] | Borrowings from Other Financial Institutions [Member]
Short-term Debt [Line Items]
Other short-term borrowings	141,060	191,453
Domestic [Member] | Other [Member]
Short-term Debt [Line Items]
Other short-term borrowings	126,060	170,044
Foreign [Member]
Short-term Debt [Line Items]
Other short-term borrowings	3,474,821	4,733,138
Other short-term borrowings—net	3,474,821	4,733,138
Foreign [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Other short-term borrowings	3,281,866	3,836,459
Foreign [Member] | Borrowings from Other Financial Institutions [Member]
Short-term Debt [Line Items]
Other short-term borrowings	113,874	631,502
Foreign [Member] | Short-term Debentures [Member]
Short-term Debt [Line Items]
Other short-term borrowings	7,775	24,009
Foreign [Member] | Other [Member]
Short-term Debt [Line Items]
Other short-term borrowings	¥ 71,306	¥ 241,168

Due to Trust Account, Short-t_6

Due to Trust Account, Short-term Borrowings and Long-term Debt (Components of Long-term Debt) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Obligations under finance leases		¥ 20,137	¥ 25,186
Total, before debt issuance costs		35,171,041	27,942,621
Debt issuance cost		(13,390)	(15,858)
Total, after debt issuance costs		35,157,651	27,926,763
MUFG [Member]
Debt Instrument [Line Items]
Obligations under finance leases		4,989	6,552
Total, before debt issuance costs		9,253,642	8,799,849
MUFG [Member] | Unsubordinated Debt [Member]
Debt Instrument [Line Items]
Long-term debt		5,490,157	5,104,562
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 4,224,401	3,864,822
Payable, currency		US dollars
Maturity date range, Start		2021
Maturity date range, End		2039
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.85%
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		4.29%
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 482,856	408,825
Payable, currency		Euro
Maturity date range, Start		2023
Maturity date range, End		2033
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.34%
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.75%
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds III [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[2]	¥ 34,262	28,382
Payable, currency		other currencies
Maturity date range, Start		2024
Maturity date range, End		2029
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds III [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.08%
MUFG [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds III [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		4.05%
MUFG [Member] | Unsubordinated Debt [Member] | Floating Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 669,464	734,254
Payable, currency		US dollars
Maturity date range, Start		2021
Maturity date range, End		2023
MUFG [Member] | Unsubordinated Debt [Member] | Floating Rate Bonds I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.87%
MUFG [Member] | Unsubordinated Debt [Member] | Floating Rate Bonds I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.24%
MUFG [Member] | Unsubordinated Debt [Member] | Floating Rate Bonds II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 45,430	41,843
Payable, currency		Euro
Maturity date		2023
Interest rate, stated percentage		0.01%
MUFG [Member] | Unsubordinated Debt [Member] | Floating Rate Bonds III [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[2]	¥ 33,744	26,436
Payable, currency		other currencies
Maturity date		2024
Interest rate, stated percentage		1.26%
MUFG [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term debt		¥ 3,758,496	3,688,735
MUFG [Member] | Subordinated Debt [Member] | Fixed Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 776,886	685,663
Payable, currency		Japanese yen
Maturity date range, Start		2024
Maturity date range, End		2031
MUFG [Member] | Subordinated Debt [Member] | Fixed Rate Bonds I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.37%
MUFG [Member] | Subordinated Debt [Member] | Fixed Rate Bonds I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.39%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 1,072,209	1,043,336
Payable, currency		Japanese yen
Maturity date range, Start		2026
Maturity date range, End		2031
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Bonds I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.29%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Bonds I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.58%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Bonds II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 1,704,816	1,756,087
Payable, currency		Japanese yen
Maturity date		no stated maturity
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Bonds II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.82%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Bonds II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.50%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 31,500	47,500
Payable, currency		Japanese yen
Maturity date range, Start		2028
Maturity date range, End		2029
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.30%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.46%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 87,085	66,649
Payable, currency		Japanese yen
Maturity date		no stated maturity
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.85%
MUFG [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.17%
MUFG [Member] | Subordinated Debt [Member] | Floating Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]		3,500
Payable, currency		Japanese yen
Maturity date		no stated maturity
Interest rate, stated percentage		3.02%
MUFG [Member] | Subordinated Debt [Member] | Floating Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 86,000	86,000
Payable, currency		Japanese yen
Maturity date range, Start		2025
Maturity date range, End		2028
MUFG [Member] | Subordinated Debt [Member] | Floating Rate Borrowings I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.57%
MUFG [Member] | Subordinated Debt [Member] | Floating Rate Borrowings I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.79%
BK [Member]
Debt Instrument [Line Items]
Obligations under finance leases		¥ 4,628	5,636
Total, before debt issuance costs		21,879,593	14,221,218
BK [Member] | Unsubordinated Debt [Member]
Debt Instrument [Line Items]
Long-term debt		20,807,593	12,819,953
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 123,300	141,700
Payable, currency		Japanese yen
Maturity date range, Start		2021
Maturity date range, End		2027
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.36%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.34%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 1,041,115	1,104,504
Payable, currency		US dollars
Maturity date range, Start		2021
Maturity date range, End		2050
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		4.70%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds III [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 109,619	108,252
Payable, currency		Euro
Maturity date range, Start		2022
Maturity date range, End		2033
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds III [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.88%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds III [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.81%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Bonds IV [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[2]	¥ 3,100	17,620
Payable, currency		other currencies
Maturity date		2047
Interest rate, stated percentage		0.00%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 18,689,074	10,440,217
Payable, currency		Japanese yen
Maturity date range, Start		2021
Maturity date range, End		2028
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.25%
BK [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 7,833	8,367
Payable, currency		US dollars
Maturity date		2030
Interest rate, stated percentage		2.93%
BK [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 721,941	897,170
Payable, currency		US dollars
Maturity date range, Start		2021
Maturity date range, End		2031
BK [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.20%
BK [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		4.11%
BK [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 111,611	102,123
Payable, currency		Euro
Maturity date range, Start		2021
Maturity date range, End		2036
BK [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
BK [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.40%
BK [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term debt		¥ 449,300	604,490
BK [Member] | Subordinated Debt [Member] | Fixed Rate Bonds I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 350,900	490,590
Payable, currency		Japanese yen
Maturity date range, Start		2021
Maturity date range, End		2031
BK [Member] | Subordinated Debt [Member] | Fixed Rate Bonds I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.39%
BK [Member] | Subordinated Debt [Member] | Fixed Rate Bonds I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.91%
BK [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 73,400	73,400
Payable, currency		Japanese yen
Maturity date range, Start		2022
Maturity date range, End		2035
BK [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.31%
BK [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.24%
BK [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 10,000	12,000
Payable, currency		Japanese yen
Maturity date		2028
Interest rate, stated percentage		0.98%
BK [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]		13,500
Payable, currency		Japanese yen
Maturity date		no stated maturity
BK [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.67%
BK [Member] | Subordinated Debt [Member] | Adjustable Rate Borrowings II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		3.52%
BK [Member] | Subordinated Debt [Member] | Floating Rate Borrowings I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 15,000	15,000
Payable, currency		Japanese yen
Maturity date		2027
Interest rate, stated percentage		0.12%
BK [Member] | Obligations under Loan Securitization Transaction Accounted for as Secured Borrowings [Member]
Debt Instrument [Line Items]
Long-term debt		¥ 618,072	791,139
Maturity date range, Start		2021
Maturity date range, End		2080
BK [Member] | Obligations under Loan Securitization Transaction Accounted for as Secured Borrowings [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.11%
BK [Member] | Obligations under Loan Securitization Transaction Accounted for as Secured Borrowings [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		8.00%
Other Subsidiaries [Member]
Debt Instrument [Line Items]
Obligations under finance leases		¥ 10,520	12,998
Total, before debt issuance costs		4,037,806	4,921,554
Other Subsidiaries [Member] | Unsubordinated Debt [Member]
Debt Instrument [Line Items]
Long-term debt		3,621,245	4,443,761
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 878,276	940,691
Payable, currency		Japanese yen
Maturity date range, Start		2021
Maturity date range, End		2051
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		56.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 885,950	1,106,465
Payable, currency		US dollars
Maturity date range, Start		2021
Maturity date range, End		2036
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		57.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes III [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 2,719	2,965
Payable, currency		Euro
Maturity date range, Start		2021
Maturity date range, End		2030
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes III [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes III [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.26%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes IV [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 349,666	387,799
Payable, currency		Thai baht
Maturity date range, Start		2021
Maturity date range, End		2027
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes IV [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes IV [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		7.15%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes V [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[2]	¥ 320,663	360,558
Payable, currency		other currencies
Maturity date range, Start		2021
Maturity date range, End		2037
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes V [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes V [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		10.25%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating/Adjustable Rate Borrowings, Bonds and Notes I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 1,007,882	1,259,427
Payable, currency		Japanese yen
Maturity date range, Start		2021
Maturity date range, End		2051
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating/Adjustable Rate Borrowings, Bonds and Notes I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating/Adjustable Rate Borrowings, Bonds and Notes I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		65.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating/Adjustable Rate Borrowings, Bonds and Notes II [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[2]		6,804
Payable, currency		other currencies
Maturity date range, Start		2020
Maturity date range, End		2024
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating/Adjustable Rate Borrowings, Bonds and Notes II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating/Adjustable Rate Borrowings, Bonds and Notes II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		7.30%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings, Bonds and Notes I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 174,997	378,217
Payable, currency		US dollars
Maturity date range, Start		2021
Maturity date range, End		2030
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings, Bonds and Notes I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings, Bonds and Notes I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		60.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings Bonds And Notes Ii [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 1,092	835
Payable, currency		Euro
Maturity date range, Start		2021
Maturity date range, End		2023
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings Bonds And Notes Ii [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Unsubordinated Debt [Member] | Floating Rate Borrowings Bonds And Notes Ii [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		4.00%
Other Subsidiaries [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term debt		¥ 406,030	458,342
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 184,894	223,095
Payable, currency		Japanese yen
Maturity date range, Start		2021
Maturity date range, End		2030
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes I [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.36%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes I [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.61%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes II [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 1,212	737
Payable, currency		US dollars
Maturity date range, Start		2022
Maturity date range, End		2030
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes II [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		7.50%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes II [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		9.90%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes III [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 209,189	220,756
Payable, currency		Thai baht
Maturity date range, Start		2027
Maturity date range, End		2029
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes III [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		3.40%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes III [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		3.90%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate Borrowings, Bonds and Notes IV [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[2]	¥ 6,915	7,179
Payable, currency		other currencies
Maturity date		2021
Interest rate, stated percentage		0.00%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Floating Rate Borrowings, Bonds and Notes I [Member]
Debt Instrument [Line Items]
Long-term debt	[1]		2,000
Payable, currency		Japanese yen
Maturity date		2021
Interest rate, stated percentage		0.73%
Other Subsidiaries [Member] | Subordinated Debt [Member] | Floating Rate Borrowings Bonds And Notes Ii [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	¥ 3,820	4,575
Payable, currency		US dollars
Maturity date		2036
Interest rate, stated percentage		1.95%
Other Subsidiaries [Member] | Obligations under Loan Securitization Transaction Accounted for as Secured Borrowings [Member]
Debt Instrument [Line Items]
Long-term debt		¥ 11	¥ 6,453
Maturity date range, Start		2021
Maturity date range, End		2022
Other Subsidiaries [Member] | Obligations under Loan Securitization Transaction Accounted for as Secured Borrowings [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.84%
Other Subsidiaries [Member] | Obligations under Loan Securitization Transaction Accounted for as Secured Borrowings [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		2.25%
[1]	Adjustable rate debts are debts where interest rates are reset in accordance with the terms of the debt agreements, and floating rate debts are debts where interest rates are repriced in accordance with movements of markets indices.
[2]	Minor currencies, such as Australian dollar, British pound, Indonesian rupiah, Brazilian real, Russian ruble etc., excluding Japanese yen, US dollars, Euro and Thai baht have been summarized into the “Other currencies” classification.

Due to Trust Account, Short-t_7

Due to Trust Account, Short-term Borrowings and Long-term Debt (Summary of Subsequent Maturities of Long-term Debt) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Long-term debt by maturity:
2022	¥ 3,872,308
2023	2,566,770
2024	2,384,914
2025	17,782,488
2026	890,339
2027 and thereafter	7,674,222
Total	35,171,041	¥ 27,942,621
MUFG [Member]
Long-term debt by maturity:
2022	792,201
2023	896,760
2024	752,246
2025	979,603
2026	513,597
2027 and thereafter	5,319,235
Total	9,253,642	8,799,849
BK [Member]
Long-term debt by maturity:
2022	2,014,430
2023	644,383
2024	1,073,761
2025	16,530,494
2026	181,556
2027 and thereafter	1,434,969
Total	21,879,593	14,221,218
Other Subsidiaries [Member]
Long-term debt by maturity:
2022	1,065,677
2023	1,025,627
2024	558,907
2025	272,391
2026	195,186
2027 and thereafter	920,018
Total	¥ 4,037,806	¥ 4,921,554

Severance Indemnities and Pen_3

Severance Indemnities and Pension Plans (Narrative) (Detail) ¥ in Millions	12 Months Ended
	Mar. 31, 2021JPY (¥)Age	Mar. 31, 2020JPY (¥)	Mar. 31, 2019JPY (¥)
Defined Benefit Plan Disclosure [Line Items]
Eligible age for lifetime annuity payments | Age	65
Special lump-sum early termination benefits charged to operations for the fiscal year	¥ 16,716	¥ 13,883	¥ 9,325
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Other Debt Securities and Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of debt securities issued by the MUFG Group included in plan assets	¥ 600	¥ 942
Percentage of fair value of debt securities issued by the MUFG Group to total fair value of plan assets	0.02%	0.03%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Japanese Marketable Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of common stock issued by the MUFG Group included in plan assets	¥ 6,116	¥ 5,843
Percentage of fair value of common stock issued by the MUFG Group to total fair value of plan assets	0.18%	0.20%

Severance Indemnities and Pen_4

Severance Indemnities and Pension Plans (Components of Net Periodic Cost of Pension Benefits and Other Benefits) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (income)	¥ 2,804	¥ (6,917)	¥ (19,839)
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost—benefits earned during the fiscal year	46,861	49,194	48,352
Interest cost on projected benefit obligation	11,091	10,969	13,504
Expected return on plan assets	(71,078)	(74,744)	(74,270)
Amortization of net actuarial loss	17,019	5,641	731
Amortization of prior service cost	(1,205)	(1,204)	(1,210)
Loss (gain) on settlements and curtailment	(4,605)	(2,366)	(5,980)
Net periodic benefit cost (income)	(1,917)	(12,510)	(18,873)
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost—benefits earned during the fiscal year	13,947	14,406	12,395
Interest cost on projected benefit obligation	14,295	17,370	14,958
Expected return on plan assets	(31,161)	(31,382)	(33,266)
Amortization of net actuarial loss	11,560	8,685	9,993
Amortization of prior service cost	(2,614)	(2,633)	(3,039)
Loss (gain) on settlements and curtailment	30	223	49
Net periodic benefit cost (income)	6,057	6,669	1,090
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost—benefits earned during the fiscal year	229	366	525
Interest cost on projected benefit obligation	793	1,159	1,046
Expected return on plan assets	(2,118)	(1,882)	(2,314)
Amortization of net actuarial loss	208	1,162	707
Amortization of prior service cost	(448)	(1,881)	(2,020)
Net periodic benefit cost (income)	¥ (1,336)	¥ (1,076)	¥ (2,056)

Severance Indemnities and Pen_5

Severance Indemnities and Pension Plans (Summary of Assumptions Used in Computation) (Detail)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Domestic Plan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used, Discount rates in determining expense	0.63%	0.61%	0.76%
Weighted-average assumptions used, Discount rates in determining benefit obligation	0.71%	0.63%	0.61%
Weighted-average assumptions used, Rates of increase in future compensation level for determining expense	3.46%	3.21%	3.21%
Weighted-average assumptions used, Rates of increase in future compensation level for determining benefit obligation	3.46%	3.46%	3.21%
Weighted-average assumptions used, Expected rates of return on plan assets	2.93%	2.89%	2.83%
Weighted-average assumptions used, Cash balance crediting rate for determining expense	2.46%	2.46%	2.46%
Weighted-average assumptions used, Cash balance crediting rate for determining benefit obligation	2.46%	2.46%	2.46%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used, Discount rates in determining expense	2.94%	3.80%	3.19%
Weighted-average assumptions used, Discount rates in determining benefit obligation	2.34%	3.05%	3.87%
Weighted-average assumptions used, Rates of increase in future compensation level for determining expense	5.12%	5.01%	4.65%
Weighted-average assumptions used, Rates of increase in future compensation level for determining benefit obligation	5.09%	5.12%	5.01%
Weighted-average assumptions used, Expected rates of return on plan assets	6.19%	6.25%	6.70%
Weighted-average assumptions used, Cash balance crediting rate for determining expense	2.39%	3.03%	2.74%
Weighted-average assumptions used, Cash balance crediting rate for determining benefit obligation	1.62%	2.39%	3.03%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used, Discount rates in determining expense	2.72%	3.87%	3.27%
Weighted-average assumptions used, Discount rates in determining benefit obligation	2.23%	2.96%	3.99%
Weighted-average assumptions used, Expected rates of return on plan assets	7.00%	7.00%	7.50%

Severance Indemnities and Pen_6

Severance Indemnities and Pension Plans (Assumed Health Care Cost Trend Rates and Effect of a One-percentage-point Change for Foreign Offices and Subsidiaries) (Detail)		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
MUAH [Member]
Defined benefit plan, assumed health care cost trend rates for the next fiscal year:
Initial trend rate	[1]	4.17%	4.14%
Ultimate trend rate	[1]	3.78%	3.77%
Year the rate reaches the ultimate trend rate	[1]	2028	2027
Other than MUAH [Member]
Defined benefit plan, assumed health care cost trend rates for the next fiscal year:
Initial trend rate	[1]	6.50%	6.50%
Ultimate trend rate	[1]	4.50%	4.50%
Year the rate reaches the ultimate trend rate	[1]	2028	2027
[1]	Fiscal years of MUFG Americas Holdings and foreign subsidiaries end on December 31. Therefore, the above tables present the rates and amounts at December 31, 2019 and 2020, respectively.

Severance Indemnities and Pen_7

Severance Indemnities and Pension Plans (Combined Funded Status and Amounts Recognized in Consolidated Balance Sheets) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Amounts recognized in the consolidated balance sheets:
Prepaid benefit cost		¥ 1,223,706	¥ 729,199
Accrued benefit cost		(93,730)	(92,225)
Domestic, Japan [Member] | Non-contributory Pension Benefits and SIP [Member]
Change in benefit obligation:
Benefit obligation at beginning of fiscal year		1,807,905	1,841,884
Service cost		46,861	49,194
Interest cost		11,091	10,969
Acquisitions / Divestitures		(2,845)	(94)
Amendments		(22)
Actuarial loss (gain)		(21,558)	(3,053)
Benefits paid		(65,730)	(66,771)
Lump-sum payment		(22,219)	(24,224)
Benefit obligation at end of fiscal year		1,753,483	1,807,905	¥ 1,841,884
Change in plan assets:
Fair value of plan assets at beginning of fiscal year		2,432,847	2,594,788
Actual return on plan assets		472,185	(123,802)
Employer contributions		21,151	28,653
Acquisitions / Divestitures		(2,440)	(21)
Benefits paid		(65,730)	(66,771)
Translation adjustments and other		0
Fair value of plan assets at end of fiscal year		2,858,013	2,432,847	2,594,788
Amounts recognized in the consolidated balance sheets:
Prepaid benefit cost		1,122,507	643,520
Accrued benefit cost		(17,977)	(18,577)
Net amount recognized		1,104,530	624,943
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of fiscal year		547,013	469,080
Service cost		13,947	14,406	12,395
Interest cost		14,295	17,370	14,958
Plan participants' contributions		30	28
Acquisitions / Divestitures		(260)	13,000
Amendments		(1,187)	3,721
Actuarial loss (gain)	[1]	51,724	58,831
Benefits paid		(20,816)	(21,120)
Lump-sum payment		(2,825)	(2,284)
Translation adjustments and other		(20,968)	(6,019)
Benefit obligation at end of fiscal year		580,953	547,013	469,080
Change in plan assets:
Fair value of plan assets at beginning of fiscal year		559,508	493,495
Actual return on plan assets		82,615	92,087
Employer contributions		3,896	2,887
Acquisitions / Divestitures			791
Plan participants' contributions		30	28
Benefits paid		(20,816)	(21,120)
Translation adjustments and other		(20,829)	(8,660)
Fair value of plan assets at end of fiscal year		604,404	559,508	493,495
Amounts recognized in the consolidated balance sheets:
Prepaid benefit cost		94,445	81,301
Accrued benefit cost		(70,994)	(68,806)
Net amount recognized		23,451	12,495
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of fiscal year		32,383	31,510
Service cost		229	366	525
Interest cost		793	1,159	1,046
Plan participants' contributions		440	455
Actuarial loss (gain)		1,506	1,648
Benefits paid		(2,488)	(2,326)
Translation adjustments and other		(1,509)	(429)
Benefit obligation at end of fiscal year		31,354	32,383	31,510
Change in plan assets:
Fair value of plan assets at beginning of fiscal year		31,919	28,258
Actual return on plan assets		5,165	5,695
Employer contributions		181	186
Plan participants' contributions		440	455
Benefits paid		(2,488)	(2,326)
Translation adjustments and other		(1,868)	(349)
Fair value of plan assets at end of fiscal year		33,349	31,919	¥ 28,258
Amounts recognized in the consolidated balance sheets:
Prepaid benefit cost		6,754	4,378
Accrued benefit cost		(4,759)	(4,842)
Net amount recognized		¥ 1,995	¥ (464)
[1]	Significant gains and losses related to changes in the benefit obligation for the fiscal years ended March 31, 2020 and 2021 primarily result from changes in the discount rate.

Severance Indemnities and Pen_8

Severance Indemnities and Pension Plans (Aggregated Accumulated Benefit Obligations) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Aggregated accumulated benefit obligations	¥ 1,719,798	¥ 1,773,042
Foreign Offices and Subsidiaries [Member] | Pension Benefits and Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Aggregated accumulated benefit obligations	¥ 554,375	¥ 523,078

Severance Indemnities and Pen_9

Severance Indemnities and Pension Plans (Summary for Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets:
Projected benefit obligations	¥ 24,527	¥ 26,442
Accumulated benefit obligations	24,527	26,442
Fair value of plan assets	6,738	7,980
Foreign Offices and Subsidiaries [Member] | Pension Benefits and Other Benefits [Member]
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets:
Projected benefit obligations	92,527	89,829
Accumulated benefit obligations	68,720	67,609
Fair value of plan assets	¥ 21,532	¥ 21,014

Severance Indemnities and Pe_10

Severance Indemnities and Pension Plans (Amounts Recognized in Accumulated OCI) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized in Accumulated OCI	¥ 20,382	¥ 337,918	¥ 208,273	¥ 119,593
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	1,557	437,254
Prior service cost	(3,072)	(4,255)
Gross amount recognized in Accumulated OCI	(1,515)	432,999
Taxes	(41,639)	(174,915)
Net amount recognized in Accumulated OCI	(43,154)	258,084
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	96,807	114,167
Prior service cost	(6,167)	(7,875)
Gross amount recognized in Accumulated OCI	90,640	106,292
Taxes	(23,900)	(27,974)
Net amount recognized in Accumulated OCI	66,740	78,318
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	3,255	5,164
Prior service cost	(1,869)	(2,304)
Gross amount recognized in Accumulated OCI	1,386	2,860
Taxes	(489)	(874)
Net amount recognized in Accumulated OCI	¥ 897	¥ 1,986

Severance Indemnities and Pe_11

Severance Indemnities and Pension Plans (Amounts Recognized in OCI) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Losses (gains) due to amortization:
Total changes in Accumulated OCI	¥ (458,939)	¥ 189,208	¥ 127,169
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain) arising during the year	(423,283)	195,492
Prior service cost arising during the year	(22)
Losses (gains) due to amortization:
Net actuarial loss	(17,019)	(5,641)
Prior service cost	1,205	1,204
Curtailment and settlement	4,605	2,366
Total changes in Accumulated OCI	(434,514)	193,421
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain) arising during the year	319	(1,732)
Prior service cost arising during the year	(1,187)	3,722
Losses (gains) due to amortization:
Net actuarial loss	(11,560)	(8,685)
Prior service cost	2,614	2,633
Curtailment and settlement	(30)	(223)
Foreign currency translation adjustments	(5,808)	(1,125)
Total changes in Accumulated OCI	(15,652)	(5,410)
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain) arising during the year	(1,541)	(2,166)
Losses (gains) due to amortization:
Net actuarial loss	(208)	(1,162)
Prior service cost	448	1,881
Foreign currency translation adjustments	(173)	(58)
Total changes in Accumulated OCI	¥ (1,474)	¥ (1,505)

Severance Indemnities and Pe_12

Severance Indemnities and Pension Plans (Weighted-average Target Asset Allocation of Plan Assets for Pension Benefits and Other Benefits) (Detail)	Mar. 31, 2021
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	100.00%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Japanese Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	36.30%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	28.60%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Non-Japanese Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	15.70%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Non-Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	13.90%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	1.40%
Domestic, Japan [Member] | Pension Benefits and SIPs [Member] | Short-term Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	4.10%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	100.00%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Japanese Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	0.30%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	0.00%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Non-Japanese Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	44.90%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Non-Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	43.00%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	10.00%
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Short-term Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	1.80%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	100.00%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member] | Japanese Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	0.00%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member] | Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	0.00%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member] | Non-Japanese Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	63.00%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member] | Non-Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	27.00%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	10.00%
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member] | Short-term Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	0.00%

Severance Indemnities and Pe_13

Severance Indemnities and Pension Plans (Estimated Future Benefit Payments) (Detail) ¥ in Millions	Mar. 31, 2021JPY (¥)
Domestic, Japan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
For the fiscal year ending March 31, 2022	¥ 82,295
For the fiscal year ending March 31, 2023	80,857
For the fiscal year ending March 31, 2024	81,015
For the fiscal year ending March 31, 2025	80,709
For the fiscal year ending March 31, 2026	79,277
Thereafter (for the fiscal years ending March 31, 2027-2031)	387,189
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
For the fiscal year ending March 31, 2022	23,248
For the fiscal year ending March 31, 2023	24,078
For the fiscal year ending March 31, 2024	25,322
For the fiscal year ending March 31, 2025	26,245
For the fiscal year ending March 31, 2026	28,020
Thereafter (for the fiscal years ending March 31, 2027-2031)	173,667
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
For the fiscal year ending March 31, 2022	1,976
For the fiscal year ending March 31, 2023	2,012
For the fiscal year ending March 31, 2024	2,032
For the fiscal year ending March 31, 2025	2,004
For the fiscal year ending March 31, 2026	1,950
Thereafter (for the fiscal years ending March 31, 2027-2031)	¥ 8,272

Severance Indemnities and Pe_14

Severance Indemnities and Pension Plans (Fair Value of Each Major Category of Plan Assets for Pension Benefits and SIP Investments: Domestic Subsidiaries) (Detail) - Domestic, Japan [Member] - Pension Benefits and SIPs [Member] - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		¥ 1,345,185	¥ 1,162,604
Approximate guaranteed rate of return of "Japanese general accounts of life insurance companies"		1.25%	1.24%
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		¥ 1,107,383	¥ 899,883
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		237,572	262,396
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		230	325
Japanese Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		145,236	147,926
Japanese Government Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		145,236	147,926
Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		24,431	19,452
Other Debt Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		10,136	7,014
Other Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		14,065	12,113
Other Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		230	325
Japanese Marketable Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		862,096	690,741
Japanese Marketable Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		862,096	690,741
Non-Japanese Marketable Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		82,113	47,890
Non-Japanese Marketable Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		81,525	47,655
Non-Japanese Marketable Equity Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		588	235
Other Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		0
Japanese General Account of Life Insurance Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1]	217,827	217,898
Japanese General Account of Life Insurance Companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1]	217,827	217,898
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		13,482	38,697
Other Investments [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		8,390	6,547
Other Investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		¥ 5,092	¥ 32,150
[1]	“Japanese general accounts of life insurance companies” is a contract with life insurance companies that guarantees a return of approximately 1.24% from April 1, 2019 to March 31, 2020 and 1.25% from April 1, 2020 to March 31, 2021.

Severance Indemnities and Pe_15

Severance Indemnities and Pension Plans (Fair Value of Each Major Category of Plan Assets for Pension Benefits and SIP Investments: Foreign Offices and Subsidiaries) (Detail) - Foreign Offices and Subsidiaries [Member] - Pension Benefits [Member] - JPY (¥) ¥ in Millions		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		¥ 457,678		¥ 414,604
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		156,021		151,399
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		301,324		262,955
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		333		250
Non-Japanese Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		48,750		47,320
Non-Japanese Government Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		44,105		42,135
Non-Japanese Government Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		4,645		5,185
Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		117,696		105,096
Other Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		117,696		105,096
Non-Japanese Marketable Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		35,255		27,597
Non-Japanese Marketable Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		34,584		26,981
Non-Japanese Marketable Equity Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		671		616
Other Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1]	241,330		231,924
Other Investment Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		76,520		81,803
Other Investment Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		164,810		150,121
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		14,647		2,667
Other Investments [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		812		480
Other Investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		13,502		1,937
Other Investments [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		¥ 333		¥ 250
MUAH [Member] | Other Investment Funds [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets			¥ 80,717		¥ 81,768
MUAH [Member] | Other Investment Funds [Member] | Common Collective Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets			¥ 128,005		¥ 119,307
[1]	Other investment funds of the foreign offices and subsidiaries include mutual funds and common collective funds of ¥81,768 million and ¥119,307 million, respectively, which were held by MUFG Americas Holdings at December 31, 2019 and ¥80,717 million and ¥128,005 million, respectively, at December 31, 2020.

Severance Indemnities and Pe_16

Severance Indemnities and Pension Plans (Fair Values of Investments Valued at Net Asset per Share (or Its Equivalent) for Pension Benefits and SIP Investments) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
Domestic Plan [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		¥ 1,512,828	¥ 1,270,243
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		580,617	486,496
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		14,763	13,891
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Japanese Pooled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		902,305	755,517
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Japanese Pooled Funds [Member] | Japanese Marketable Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		118,509	125,218
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Japanese Pooled Funds [Member] | Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		324,700	212,727
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Japanese Pooled Funds [Member] | Non-Japanese Marketable Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		90,598	146,796
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Japanese Pooled Funds [Member] | Non-Japanese Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		215,015	169,978
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Japanese Pooled Funds [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		153,483	100,798
Domestic Plan [Member] | Pension Benefits and SIPs [Member] | Other Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)	[1]	610,523	514,726
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		146,726	144,904
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Other Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)	[2]	146,726	144,904
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Other Investment Funds [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		58,086	56,125
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Other Investment Funds [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		51,318	54,474
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member] | Other Investment Funds [Member] | Common Collective Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments valued at net asset per share (or its equivalent)		¥ 37,161	¥ 34,098
[1]	Other investment funds of the domestic subsidiaries include mutual funds and real estate funds of ¥486,496 million and ¥13,891 million, respectively, at March 31, 2020 and ¥580,617 million and ¥14,763 million, respectively, at March 31, 2021.
[2]	Other investment funds of the foreign offices and subsidiaries include mutual funds, real estate funds and common collective funds of ¥56,125 million, ¥54,474 million and ¥34,098 million, respectively, at March 31, 2020 and ¥58,086 million, ¥51,318 million and ¥37,161 million, respectively, at March 31, 2021.

Other Assets and Liabilities (N

Other Assets and Liabilities (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investments in equity method investees	¥ 2,560,339	¥ 2,421,154
Marketable equity securities included in investment in equity method investees, aggregated market values	3,943,990	1,987,008
Investment in equity method investees, recognized impairment losses of other-than-temporary declines in the value of investments in certain affiliated companies	¥ 53,758	21,672	¥ 51,645
Morgan Stanley [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, Ownership percentage, approximately	20.18%
Marketable Equity Securities [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity method investees	¥ 1,964,118	1,809,161
Marketable Equity Securities [Member] | Morgan Stanley [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity method investees	1,618,579	1,411,131
Marketable Equity Securities [Member] | Morgan Stanley MUFG Securities, Co., Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity method investees	¥ 174,190	¥ 185,255

Other Assets and Liabilities (M

Other Assets and Liabilities (Major Components of Other Assets and Liabilities) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
Other assets:
Accounts receivable: Receivables from brokers, dealers and customers for securities transactions		¥ 400,776	¥ 1,191,690
Accounts receivable: Other	[1]	1,162,424	1,212,511
Investments in equity method investees		2,560,339	2,421,154
Prepaid benefit cost (Note 13)		1,223,706	729,199
Cash collateral pledged for derivative transactions (Note 9)		2,005,136	1,696,108
Cash collateral for the use of Bank of Japan's settlement infrastructure		998,838	965,546
Accrued interest		259,336	308,448
Deferred tax assets (Note 8)		122,031	113,031
Right-of-use assets of operating leases (Note 7)		338,547	393,435
Other		4,250,171	4,077,577
Total		13,321,304	13,108,699
Other liabilities:
Accounts payable: Payables to brokers, dealers and customers for securities transactions		1,202,371	1,078,653
Accounts payable: Other		1,281,436	1,251,260
Obligations to return securities received as collateral (Notes 15, 16 and 31)		6,581,759	4,806,171
Accrued interest		110,856	187,096
Deferred tax liabilities (Note 8)		827,571	541,368
Allowance for off-balance sheet credit instruments		83,615	56,995
Accrued benefit cost (Note 13)		93,730	92,225
Guarantees and indemnifications		38,123	39,601
Cash collateral received for derivative transactions (Note 9)		909,641	1,125,305
Obligations under operating leases (Note 7)		476,104	482,813
Accrued and other liabilities		3,465,614	3,562,359
Total		¥ 15,070,820	¥ 13,223,846
[1]	Accounts receivable—Other is primarily comprised of receivables relating to the card business. The provision or reversal of the allowance for credit losses relating to the receivables is included in Non-interest expense on the condensed consolidated statements of income. The receivables relating to the card business include ¥4,980 million of past due receivables (1-3 months past due receivables of ¥2,252 million and greater than 3 months past due receivables of ¥2,728 million) as of March 31, 2021, and the credit quality for these receivables is primarily evaluated based on the extent of past due. The outstanding balance of the accounts receivable is presented on a net basis after allowance for credit losses. Upon adoption of the new guidance on measurement of credit losses on financial instruments as of April 1, 2020, the amount of the allowance for credit losses increased by ¥10,248 million. The change of allowance for credit losses on these receivables during the period ended March 31, 2021 is primarily due to provision of the allowance for the receivables.

Other Assets and Liabilities _3

Other Assets and Liabilities (Major Components of Other Assets and Liabilities) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions	Apr. 01, 2020	Mar. 31, 2021	Mar. 31, 2020
Other Assets And Liabilities [Line Items]
Financing receivable past due		¥ 530,901	¥ 553,956
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Other Assets And Liabilities [Line Items]
Account receivable other past due		2,252
Credit Card Receivable [Member]
Other Assets And Liabilities [Line Items]
Financing receivable past due		4,980
Increase in allowances for credit losses due to change in accounting policy	¥ 10,248
Credit Card Receivable [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Other Assets And Liabilities [Line Items]
Financing receivable past due		¥ 2,728

Other Assets and Liabilities (S

Other Assets and Liabilities (Summarized Financial Information of Morgan Stanley) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Equity Method Investment, Summarized Financial Information, Assets
Total assets	¥ 353,824,625	¥ 331,753,283	¥ 305,228,899
Equity Method Investment, Summarized Financial Information, Liabilities and Equity
Total liabilities	337,580,071	316,008,767
Noncontrolling interests	583,605	728,029
Equity Method Investment, Summarized Financial Information, Income and Loss
Net income	1,163,394	318,715	737,605
Morgan Stanley [Member]
Equity Method Investment, Summarized Financial Information, Assets
Trading assets	34,670,000	29,484,000
Securities purchased under agreements to resell	12,701,000	11,405,000
Securities borrowed	11,309,000	7,868,000
Total assets	128,288,000	103,149,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity
Deposits	35,775,000	25,601,000
Customer and other payables	25,477,000	21,556,000
Borrowings	23,894,000	21,206,000
Total liabilities	116,377,000	93,656,000
Noncontrolling interests	147,000	149,000
Equity Method Investment, Summarized Financial Information, Income and Loss
Net revenues	5,841	4,457	4,363
Total non-interest expenses	3,932	3,259	3,168
Income from continuing operations before income taxes	1,881	1,140	1,195
Net income	¥ 1,433	¥ 903	¥ 944

Other Assets and Liabilities _4

Other Assets and Liabilities (Summarized Financial Information of Equity Method Investees, Other than Morgan Stanley) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Equity Method Investment, Summarized Financial Information, Assets
Total assets	¥ 353,824,625	¥ 331,753,283	¥ 305,228,899
Equity Method Investment, Summarized Financial Information, Liabilities and Equity
Total liabilities	337,580,071	316,008,767
Noncontrolling interests	583,605	728,029
Equity Method Investment, Summarized Financial Information, Income and Loss
Net income	1,163,394	318,715	737,605
Equity Method Investees Other than Morgan Stanley [Member]
Equity Method Investment, Summarized Financial Information, Assets
Net loans	15,417,000	15,190,000
Total assets	28,459,000	29,255,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity
Deposits	9,651,000	8,898,000
Total liabilities	24,176,000	24,025,000
Noncontrolling interests	85,000	1,005,000
Equity Method Investment, Summarized Financial Information, Income and Loss
Total interest income	1,058,000	1,093,000	1,036,000
Total interest expense	375,000	419,000	430,000
Net interest income	683,000	674,000	606,000
Provision for credit losses	215,000	171,000	157,000
Income before income tax expense	476,000	366,000	205,000
Net income	¥ 400,000	¥ 285,000	¥ 135,000

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		Mar. 31, 2021	Mar. 31, 2020
Offsetting [Abstract]
Derivative assets, Gross amounts of recognized assets/liabilities		¥ 11,997,000	¥ 14,958,000
Derivative assets, Net amounts presented in the consolidated balance sheet	[1],[2],[3]	11,997,000	14,958,000
Derivative assets, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(8,628,000)	(11,282,000)
Derivative assets, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged		(605,000)	(874,000)
Derivative assets, Net amounts		2,764,000	2,802,000
Receivables under resale agreements, Gross amounts of recognized assets/liabilities		16,053,000	25,884,000
Receivables under resale agreements, Gross amounts offset in the consolidated balance sheet		(2,273,000)	(1,888,000)
Receivables under resale agreements, Net amounts presented in the consolidated balance sheet		13,779,763	23,995,961
Receivables under resale agreements, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(12,687,000)	(23,195,000)
Receivables under resale agreements, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged		(37,000)	(21,000)
Receivables under resale agreements, Net amounts		1,056,000	780,000
Receivables under securities borrowing transactions, Gross amounts of recognized assets/liabilities		3,370,000	3,444,000
Receivables under securities borrowing transactions, Net amounts presented in the consolidated balance sheet		3,369,903	3,443,959
Receivables under securities borrowing transactions, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(3,289,000)	(3,336,000)
Receivables under securities borrowing transactions, Net amounts		81,000	108,000
Financial assets, Gross amounts of recognized assets/liabilities, Total		31,420,000	44,286,000
Financial assets, Gross amounts offset in the consolidated balance sheet, Total		(2,273,000)	(1,888,000)
Financial assets, Net amounts presented in the consolidated balance sheet, Total		29,147,000	42,398,000
Financial assets, Gross amounts not offset in the consolidated balance sheet, Financial instruments, Total		(24,604,000)	(37,813,000)
Financial assets, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged, Total		(642,000)	(895,000)
Financial assets, Net amounts, Total		3,901,000	3,690,000
Derivative liabilities, Gross amounts of recognized assets/liabilities		11,714,000	14,034,000
Derivative liabilities, Net amounts presented in the consolidated balance sheet	[1],[2],[3]	11,714,000	14,034,000
Derivative liabilities, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(8,545,000)	(11,296,000)
Derivative liabilities, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged		(1,624,000)	(1,140,000)
Derivative liabilities, Net amounts		1,545,000	1,598,000
Payables under repurchase agreements, Gross amounts of recognized assets/liabilities		26,800,000	33,733,000
Payables under repurchase agreements, Gross amounts offset in the consolidated balance sheet		(2,232,000)	(1,883,000)
Payables under repurchase agreements, Net amounts presented in the consolidated balance sheet		24,568,000	31,850,000
Payables under repurchase agreements, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(23,835,000)	(31,569,000)
Payables under repurchase agreements, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged		(60,000)	(34,000)
Payables under repurchase agreements, Net amounts		673,000	247,000
Payables under securities lending transactions, Gross amounts of recognized assets/liabilities		843,000	1,017,000
Payables under securities lending transactions, Net amounts presented in the consolidated balance sheet		842,590	1,016,874
Payables under securities lending transactions, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(814,000)	(986,000)
Payables under securities lending transactions, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged		(2,000)
Payables under securities lending transactions, Net amounts		27,000	31,000
Obligations to return securities received as collateral, Gross amounts of recognized assets/liabilities		6,582,000	4,806,000
Obligations to return securities received as collateral, Net amounts presented in the consolidated balance sheet		6,581,759	4,806,171
Obligations to return securities received as collateral, Gross amounts not offset in the consolidated balance sheet, Financial instruments		(1,931,000)	(1,966,000)
Obligations to return securities received as collateral, Net amounts		4,651,000	2,840,000
Financial liabilities, Gross amounts of recognized assets/liabilities, Total		45,939,000	53,590,000
Financial liabilities, Gross amounts offset in the consolidated balance sheet, Total		(2,232,000)	(1,883,000)
Financial liabilities, Net amounts presented in the consolidated balance sheet, Total		43,707,000	51,707,000
Financial liabilities, Gross amounts not offset in the consolidated balance sheet, Financial instruments, Total		(35,125,000)	(45,817,000)
Financial liabilities, Gross amounts not offset in the consolidated balance sheet, Cash collateral received/pledged, Total		(1,686,000)	(1,174,000)
Financial liabilities, Net amounts, Total		¥ 6,896,000	¥ 4,716,000
[1]	For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 31.
[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	Mar. 31, 2021	Mar. 31, 2020
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	¥ 26,800	¥ 33,733
Payables under securities lending transactions	843	1,017
Obligations to return securities received as collateral	6,582	4,806
Total	34,225	39,556
Overnight and Open [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	6,006	9,685
Payables under securities lending transactions	789	934
Obligations to return securities received as collateral	5,607	3,856
Total	12,402	14,475
30 Days or Less [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	16,888	16,608
Payables under securities lending transactions	26	64
Obligations to return securities received as collateral	278	599
Total	17,192	17,271
31-90 Days [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	1,973	4,496
Payables under securities lending transactions	28	19
Obligations to return securities received as collateral	528	276
Total	2,529	4,791
Over 90 Days [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	1,933	2,944
Obligations to return securities received as collateral	169	75
Total	¥ 2,102	¥ 3,019

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	Mar. 31, 2021	Mar. 31, 2020
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	¥ 26,800	¥ 33,733
Payables under securities lending transactions	843	1,017
Obligations to return securities received as collateral	6,582	4,806
Total	34,225	39,556
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	7,754	10,687
Payables under securities lending transactions	104	38
Obligations to return securities received as collateral	4,022	2,241
Total	11,880	12,966
Foreign Government and Official Institution Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	13,914	17,326
Payables under securities lending transactions	17	57
Obligations to return securities received as collateral	738	873
Total	14,669	18,256
Corporate Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	702	784
Payables under securities lending transactions	1
Obligations to return securities received as collateral	214	183
Total	917	967
Residential Mortgage-backed Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	3,729	4,248
Obligations to return securities received as collateral		10
Total	3,729	4,258
Other Debt Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	218	157
Obligations to return securities received as collateral	5	2
Total	223	159
Marketable Equity Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	462	506
Payables under securities lending transactions	721	914
Obligations to return securities received as collateral	1,603	1,497
Total	2,786	2,917
Others [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	21	25
Payables under securities lending transactions		8
Total	¥ 21	¥ 33

Preferred Stock (Narrative) (De

Preferred Stock (Narrative) (Detail) - ¥ / shares	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Class of Stock [Line Items]
Number of Preferred Stock outstanding
Class 5 Preferred Stock [Member]
Class of Stock [Line Items]
Stock authorized, shares	400,000,000
Liquidation distribution per share	¥ 2,500
Class 6 Preferred Stock [Member]
Class of Stock [Line Items]
Stock authorized, shares	200,000,000
Liquidation distribution per share	¥ 2,500
Class 7 Preferred Stock [Member]
Class of Stock [Line Items]
Stock authorized, shares	200,000,000
Liquidation distribution per share	¥ 2,500

Common Stock and Capital Surp_3

Common Stock and Capital Surplus (Narrative) (Detail) - JPY (¥) ¥ in Millions	1 Months Ended
	Dec. 23, 2019	Dec. 10, 2018	Jun. 04, 2018	Mar. 31, 2021	Nov. 13, 2019	Nov. 13, 2018	May 15, 2018
Common Stock [Member]
Treasury Stock:
Number of own shares repurchased	85,775,400	159,836,800	72,420,700
Approximate repurchase amount in aggregate of own shares based on the discretionary dealing contract	¥ 50,000	¥ 100,000	¥ 50,000
Approximate percentage of shares allowed for repurchase over total number of outstanding shares					0.77%	1.52%	0.76%
Date of own shares cancelled	Jan. 20, 2020	Jan. 22, 2019	Jul. 20, 2018
Common Stock [Member] | Maximum [Member]
Treasury Stock:
Aggregated Number of shares allowed for repurchase					100,000,000	200,000,000	100,000,000
Aggregate amount of shares allowed for repurchase					¥ 50,000	¥ 100,000	¥ 50,000
Companies Act [Member] | Minimum [Member]
Common Stock and Capital Surplus Disclosure [Line Items]
Percentage of proceeds per issuance of common stock, including conversions of bonds and notes, to be credited to the common stock account				50.00%
Percentage of outstanding common stock issued as free share distribution prior to April 1, 1991				5.00%
Companies Act [Member] | Maximum [Member]
Common Stock and Capital Surplus Disclosure [Line Items]
Percentage of outstanding common stock issued as free share distribution prior to April 1, 1991				10.00%
BK and TB [Member] | Companies Act [Member] | Common Stock [Member]
Common Stock and Capital Surplus Disclosure [Line Items]
Increase (decrease) by amount equal to the fair value of the shares issued by the application of U.S. accounting practices for issuance of free shares distribution made prior to April 1, 1991				¥ 1,910,106
BK and TB [Member] | Companies Act [Member] | Unappropriated Retained Earnings [Member]
Common Stock and Capital Surplus Disclosure [Line Items]
Increase (decrease) by amount equal to the fair value of the shares issued by the application of U.S. accounting practices for issuance of free shares distribution made prior to April 1, 1991				¥ 1,910,106

Common Stock and Capital Surp_4

Common Stock and Capital Surplus (Changes in Number of Issued Shares of Common Stock) (Detail) - Common Stock [Member] - shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Common Stock and Capital Surplus Disclosure [Line Items]
Balance at beginning of fiscal year	13,581,995,120	13,667,770,520	13,900,028,020
Retirement of shares of common stock	0	(85,775,400)	(232,257,500)
Balance at end of fiscal year	13,581,995,120	13,581,995,120	13,667,770,520

Retained Earnings, Legal Rese_2

Retained Earnings, Legal Reserve and Dividends (Narrative) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020	Oct. 01, 2005	Apr. 02, 2001
Retained Earnings Appropriated and Transferred [Line Items]
Common stock and preferred stock issued, Value	¥ 2,090,270	¥ 2,090,270
Legal capital surplus	¥ 5,533,761	¥ 5,533,520
Companies Act [Member] | Minimum [Member]
Retained Earnings Appropriated and Transferred [Line Items]
Percentage of aggregate amount of cash dividends and certain appropriations of retained earnings associated with cash set aside as legal reserve	10.00%
Companies Act [Member] | Maximum [Member]
Retained Earnings Appropriated and Transferred [Line Items]
Percentage of aggregate amount of legal reserve set aside as an appropriation of retained earnings and the legal capital surplus over stated capital	25.00%
Percentage of aggregate amount of legal reserve set aside as an appropriation of retained earnings and the legal capital surplus available for dividends over stated capital	25.00%
Banking Law [Member] | Minimum [Member]
Retained Earnings Appropriated and Transferred [Line Items]
Percentage of aggregate amount of cash dividends and certain appropriations of retained earnings associated with cash set aside as legal reserve	20.00%
Banking Law [Member] | Maximum [Member]
Retained Earnings Appropriated and Transferred [Line Items]
Percentage of aggregate amount of legal reserve set aside as an appropriation of retained earnings and the legal capital surplus over stated capital	100.00%
Percentage of aggregate amount of legal reserve set aside as an appropriation of retained earnings and the legal capital surplus available for dividends over stated capital	100.00%
Code and Japanese GAAP [Member]
Retained Earnings Appropriated and Transferred [Line Items]
Common stock issued, Value				¥ 924,400
Preferred stock issued, Value				222,100
Common stock and preferred stock issued, Value			¥ 1,383,052
Legal capital surplus			3,577,570	2,838,693
Retained earnings			¥ 757,458
Japanese GAAP [Member]
Retained Earnings Appropriated and Transferred [Line Items]
MUFG's amount available for dividends	¥ 4,356,678

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	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains (losses) on investment securities, Balance at beginning of fiscal year	¥ (344,785)	¥ (369,369)	¥ 2,270,346
Net unrealized gains (losses) on investment securities, Net change during the fiscal year	(38,253)	24,584	60,616
Net unrealized gains (losses) on investment securities, Effect of adopting new guidance	(383,004)	(344,785)	(369,369)
Net unrealized gains (losses) on investment securities, Balance at end of fiscal year	(383,004)	(344,785)	(369,369)
Net debt valuation adjustments, Balance at beginning of fiscal year	45,502	(8,670)	(16,488)
Net debt valuation adjustments, Net change during the fiscal year	(83,364)	54,172	9,729
Net debt valuation adjustments, Effect of adopting new guidance	(37,862)	45,502	(8,670)
Net debt valuation adjustments, Balance at end of fiscal year	(37,862)	45,502	(8,670)
Net unrealized losses on derivatives qualifying for cash flow hedges, Balance at beginning of fiscal year	(13,343)	(24,140)	(19,250)
Net unrealized losses on derivatives qualifying for cash flow hedges, Net change during the fiscal year	32,372	10,797	(4,890)
Net unrealized losses on derivatives qualifying for cash flow hedges, Balance at end of fiscal year	19,029	(13,343)	(24,140)
Defined benefit plans, Balance at beginning of fiscal year	(337,918)	(208,273)	(119,593)
Defined benefit plans, Net change during the fiscal year	317,536	(129,645)	(88,680)
Defined benefit plans, Balance at end of fiscal year	(20,382)	(337,918)	(208,273)
Foreign currency translation adjustments, Balance at beginning of fiscal year	230,127	326,183	362,300
Foreign currency translation adjustments, Net change during the fiscal year	(97,389)	(96,056)	(36,117)
Foreign currency translation adjustments, Balance at end of fiscal year	132,738	230,127	326,183
Accumulated other comprehensive income (loss), net of taxes: Balance at end of fiscal year	(289,481)	(420,417)	(284,269)
Net Unrealized Gains (Losses) on Investment Securities [Member] | Foreign Affiliated Company [Member] | Effect of adopting new guidance [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains (losses) on investment securities, Balance at beginning of fiscal year		(2,700,331)
Net unrealized gains (losses) on investment securities, Effect of adopting new guidance			(2,700,331)
Net unrealized gains (losses) on investment securities, Balance at end of fiscal year			(2,700,331)
Net Unrealized Gains (Losses) on Investment Securities [Member] | Measurement of credit losses on financial instruments [Member] | Effect of adopting new guidance [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains (losses) on investment securities, Effect of adopting new guidance	34
Net unrealized gains (losses) on investment securities, Balance at end of fiscal year	¥ 34
Net Debt Valuation Adjustments [Member] | Recognition and Measurement of Financial Assets and Financial Liabilities [Member] | Effect of adopting new guidance [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net debt valuation adjustments, Balance at beginning of fiscal year		¥ (1,911)
Net debt valuation adjustments, Effect of adopting new guidance			(1,911)
Net debt valuation adjustments, Balance at end of fiscal year			¥ (1,911)

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	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net unrealized gains (losses) on investment securities, Before tax:
Net unrealized gains (losses) on investment securities	¥ (69,247)	¥ 100,974	¥ 132,723
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	(383)	(107,102)	(28,953)
Net change	(69,630)	(6,128)	103,770
Net unrealized gains (losses) on investment securities, Tax (expense) or benefit:
Net unrealized gains on investment securities	(599)	(2,260)	(24,690)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	(547)	32,007	9,100
Net change	(1,146)	29,747	(15,590)
Net unrealized gains (losses) on investment securities, Net of tax:
Net unrealized gains on investment securities	(69,846)	98,714	108,033
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	(930)	(75,095)	(19,853)
Net change	(70,776)	23,619	88,180
Net unrealized gains (losses) on investment securities attributable to noncontrolling interests	(32,523)	(965)	27,564
Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group	(38,253)	24,584	60,616
Net debt valuation adjustments, Before tax:
Net debt valuation adjustments	(126,007)	77,765	13,006
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests	5,851	315	1,016
Net change	(120,156)	78,080	14,022
Net debt valuation adjustments, Tax (expense) or benefit:
Net debt valuation adjustments	38,584	(23,812)	(3,982)
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests	(1,792)	(96)	(311)
Net change	36,792	(23,908)	(4,293)
Net debt valuation adjustments, Net of tax:
Net debt valuation adjustments	(87,423)	53,953	9,024
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests	4,059	219	705
Net change	(83,364)	54,172	9,729
Net debt valuation adjustments attributable to noncontrolling interests
Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group	(83,364)	54,172	9,729
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Before tax:
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges	44,255	1,375	(10,397)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	164	13,279	3,662
Net change	44,419	14,654	(6,735)
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	(12,359)	(560)	2,825
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	115	(3,452)	(980)
Net change	(12,244)	(4,012)	1,845
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	31,896	815	(7,572)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	279	9,827	2,682
Net change	32,175	10,642	(4,890)
Net unrealized losses on derivatives qualifying for cash flow hedges attributable to noncontrolling interests	(197)	(155)	0
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group	32,372	10,797	(4,890)
Defined benefit plans, Before tax:
Defined benefit plans	436,435	(195,851)	(126,001)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	22,504	6,643	(1,168)
Net change	458,939	(189,208)	(127,169)
Defined benefit plans, Tax (expense) or benefit:
Defined benefit plans	(133,404)	59,426	37,655
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	(6,479)	(1,741)	574
Net change	(139,883)	57,685	38,229
Defined benefit plans, Net of tax:
Defined benefit plans	303,031	(136,425)	(88,346)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	16,025	4,902	(594)
Net change	319,056	(131,523)	(88,940)
Defined benefit plans attributable to noncontrolling interests	1,520	(1,878)	(260)
Defined benefit plans attributable to Mitsubishi UFJ Financial Group	317,536	(129,645)	(88,680)
Foreign currency translation adjustments, Before tax:
Foreign currency translation adjustments	(61,085)	(99,520)	(18,062)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	(57,534)	(2,238)	(9,002)
Net change	(118,619)	(101,758)	(27,064)
Foreign currency translation adjustments, Tax (expense) or benefit:
Foreign currency translation adjustments	(14,370)	19,588	(17,932)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	17,738	1,105	2,784
Net change	3,368	20,693	(15,148)
Foreign currency translation adjustments, Net of tax:
Foreign currency translation adjustments	(75,455)	(79,932)	(35,994)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests	(39,796)	(1,133)	(6,218)
Net change	(115,251)	(81,065)	(42,212)
Foreign currency translation adjustments attributable to noncontrolling interests	(17,862)	14,991	(6,095)
Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group	(97,389)	(96,056)	(36,117)
Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group	¥ 130,902	¥ (136,148)	¥ (59,342)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income (Loss) (Reclassification of Significant Items out of Accumulated OCI) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains (losses)—net		¥ (1,458,264)	¥ 532,248	¥ 252,307
Interest income on Loans, including fees		(1,940,754)	(2,597,932)	(2,576,417)
Other non-interest income		(109,615)	(88,422)	(103,665)
Other non-interest expenses		(322,171)	(367,721)	(302,687)
Total before tax		(1,608,342)	(433,220)	(870,842)
Income tax expense		444,948	114,505	133,237
Net of tax		(1,163,394)	(318,715)	(737,605)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(29,398)	(89,103)	(34,445)
Income tax expense		9,035	27,823	11,167
Net of tax		(20,363)	(61,280)	(23,278)
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		(6,799)	(499)	(367)
Total before tax		(383)	(107,102)	(28,953)
Income tax expense		(547)	32,007	9,100
Net of tax		(930)	(75,095)	(19,853)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Investment Securities [Member] | Net Losses (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 (losses)—net		6,410	(108,193)	(29,182)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Investment Securities [Member] | Impairment Losses on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains (losses)—net		6	1,590	596
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 or Other non-interest income		5,851	315	1,016
Total before tax		5,851	315	1,016
Income tax expense		(1,792)	(96)	(311)
Net of tax		4,059	219	705
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			2	(77)
Total before tax		164	13,279	3,662
Income tax expense		115	(3,452)	(980)
Net of tax		279	9,827	2,682
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		(3,579)	9,878	3,739
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Losses (Gains) on Derivatives Qualifying for Cash Flow Hedges [Member] | Foreign Exchange Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense on Long-term debt or Foreign exchange losses—net		3,743	3,399
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		22,504	6,643	(1,168)
Income tax expense		(6,479)	(1,741)	574
Net of tax		16,025	4,902	(594)
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	[1]	28,787	15,488	11,431
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	[1]	(4,267)	(5,718)	(6,269)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans [Member] | Gain on settlements and curtailment, and other [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest income or expenses	[1]	(2,016)	(3,127)	(6,330)
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		(57,561)	(5,003)	(9,004)
Other non-interest expenses		27	2,765	2
Total before tax		(57,534)	(2,238)	(9,002)
Income tax expense		17,738	1,105	2,784
Net of tax		¥ (39,796)	¥ (1,133)	¥ (6,218)
[1]	These Accumulated OCI components are components of net periodic benefit cost. See Note 13 for more information.

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Narrative) (Detail) ¥ in Millions	12 Months Ended
	Mar. 31, 2021JPY (¥)	Dec. 31, 2020	Mar. 31, 2020JPY (¥)	Dec. 31, 2019
Basel III [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk weighted threshold of items not deducted from Common Equity Tier 1 capital	250.00%
FSA's requirements applicable to Japanese banking institutions [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum Common Equity Tier 1 capital ratio	4.50%		4.50%
Capital conservation buffer	2.50%		2.50%
G-SIB surcharge	1.50%		1.50%
Countercyclical buffer	0.00%		0.01%
Tier 1 Leverage Ratio	0.03
Percentage of G-SIB leverage ratio buffer to G-SIB capital surcharge, effective on January 1, 2022	50.00%
Basel III for Security Companies in Japan [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum capital ratio required for financial Instruments firms to maintain by Financial Instruments and Exchange Act and related ordinance	120.00%
Minimum capital ratio requirement for financial instruments firms which will call for regulatory reporting	140.00%
Minimum capital ratio requirement for financial instrument firms which may lead to a suspension of all or part of the business for a period of time and cancellation of a registration	100.00%
U.S. Basel III [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum Common Equity Tier 1 capital ratio	4.50%
Capital conservation buffer	2.50%
Total minimum Common Equity Tier 1 capital ratio	7.00%
Countercyclical buffer	2.50%
Tier 1 Leverage Ratio	0.04
Tier 1 Supplementary Leverage Ratio	0.03
Phase-in period to eliminate the Accumulated OCI or loss exclusion applied under Basel I and Basel II rules	4 years
Capital conservation buffer phase-in arrangements	0.625%
Phase-in period for full implementation of capital conservation buffer	4 years
Mitsubishi UFJ Morgan Stanley Securities [Member] | Basel III for Security Companies in Japan [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount of capital accounts less certain fixed assets			¥ 465,343
Percentage of capital accounts to the total amounts equivalent to market, counterparty credit and operational risks			316.20%
Stand-alone, Mitsubishi UFJ Morgan Stanley Securities [Member] | Basel III for Security Companies in Japan [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount of capital accounts less certain fixed assets	¥ 475,343		¥ 440,520
Percentage of capital accounts to the total amounts equivalent to market, counterparty credit and operational risks	275.40%		313.00%
BK (US) [Member] | U.S. Basel III [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum total risk-based capital ratio to be categorized as "well capitalized"		0.10		0.10
Tier 1 risk-based capital ratio to be categorized as "well capitalized"		0.08		0.08
Tier 1 capital to quarterly average assets to be categorized as "well capitalized"		0.05		0.05
Common Equity Tier 1 risk-based capital ratio to be categorized as "well capitalized"		6.50%		6.50%

Regulatory Capital Requiremen_4

Regulatory Capital Requirements (Risk-adjusted Capital Amounts and Ratios, Japan) (Detail) ¥ in Millions		Mar. 31, 2021JPY (¥)	Mar. 31, 2020JPY (¥)
Consolidated, MUFG [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount	[1]	¥ 18,669,510	¥ 18,279,566
Total capital (to risk-weighted assets): Actual ratio	[1]	0.1631	0.1587
Tier 1 capital (to risk-weighted assets): Actual amount	[1]	¥ 15,982,746	¥ 15,623,321
Tier 1 capital (to risk-weighted assets): Actual ratio	[1]	0.1396	0.1356
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount	[1]	¥ 14,113,722	¥ 13,708,333
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio	[1]	0.1233	0.1190
Leverage Ratio: Actual amount		¥ 15,982,746	¥ 15,623,321
Leverage Ratio: Actual ratio		0.0545	0.0442
Total capital (to risk-weighted assets): Amount for capital adequacy purposes	[1]	¥ 13,730,324	¥ 13,827,788
Total capital (to risk-weighted assets): Ratio for capital adequacy purposes	[1]	0.1200	0.1201
Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes	[1]	¥ 11,441,937	¥ 11,525,076
Tier 1 capital (to risk-weighted assets): Ratio for capital adequacy purposes	[1]	0.1000	0.1001
Common Equity Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes	[1]	¥ 9,725,646	¥ 9,798,042
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required	[1]	8.50%	8.51%
Leverage Ratio: Amount for capital adequacy purposes		¥ 8,781,753	¥ 10,593,527
Leverage Ratio: Ratio for capital adequacy purposes		0.0300	0.0300
Consolidated, MUFG [Member] | FSA's requirements applicable to Japanese banking institutions [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required		4.50%	4.50%
Capital conservation buffer		2.50%	2.50%
G-SIB surcharge		1.50%	1.50%
Countercyclical buffer		0.00%	0.01%
Consolidated, BK [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount		¥ 14,630,443	¥ 14,285,601
Total capital (to risk-weighted assets): Actual ratio		0.1504	0.1443
Tier 1 capital (to risk-weighted assets): Actual amount		¥ 12,411,352	¥ 12,170,005
Tier 1 capital (to risk-weighted assets): Actual ratio		0.1276	0.1229
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount		¥ 10,865,302	¥ 10,597,133
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio		0.1117	0.1070
Leverage Ratio: Actual amount		¥ 12,411,352	¥ 12,170,005
Leverage Ratio: Actual ratio		0.0522	0.0421
Total capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 7,779,147	¥ 7,917,895
Total capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0800	0.0800
Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 5,834,360	¥ 5,938,421
Tier 1 capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0600	0.0600
Common Equity Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 4,375,770	¥ 4,453,816
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required		4.50%	4.50%
Leverage Ratio: Amount for capital adequacy purposes		¥ 7,123,396	¥ 8,656,169
Leverage Ratio: Ratio for capital adequacy purposes		0.0300	0.0300
Consolidated, TB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount		¥ 2,099,662	¥ 1,889,973
Total capital (to risk-weighted assets): Actual ratio		0.2247	0.2546
Tier 1 capital (to risk-weighted assets): Actual amount		¥ 1,870,988	¥ 1,625,712
Tier 1 capital (to risk-weighted assets): Actual ratio		0.2002	0.2190
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount		¥ 1,681,140	¥ 1,444,348
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio		0.1799	0.1946
Leverage Ratio: Actual amount		¥ 1,870,988	¥ 1,625,712
Leverage Ratio: Actual ratio		0.0753	0.0451
Total capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 747,524	¥ 593,652
Total capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0800	0.0800
Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 560,643	¥ 445,239
Tier 1 capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0600	0.0600
Common Equity Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 420,482	¥ 333,929
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required		4.50%	4.50%
Leverage Ratio: Amount for capital adequacy purposes		¥ 744,744	¥ 1,079,863
Leverage Ratio: Ratio for capital adequacy purposes		0.0300	0.0300
Stand-alone, BK [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount		¥ 12,359,493	¥ 12,092,262
Total capital (to risk-weighted assets): Actual ratio		0.1460	0.1476
Tier 1 capital (to risk-weighted assets): Actual amount		¥ 10,512,405	¥ 10,254,608
Tier 1 capital (to risk-weighted assets): Actual ratio		0.1242	0.1252
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount		¥ 9,025,272	¥ 8,738,975
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio		0.1066	0.1067
Leverage Ratio: Actual amount		¥ 10,512,405	¥ 10,254,608
Leverage Ratio: Actual ratio		0.0514	0.0402
Total capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 6,770,631	¥ 6,550,969
Total capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0800	0.0800
Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 5,077,974	¥ 4,913,227
Tier 1 capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0600	0.0600
Common Equity Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 3,808,480	¥ 3,684,920
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required		4.50%	4.50%
Leverage Ratio: Amount for capital adequacy purposes		¥ 6,127,521	¥ 7,644,928
Leverage Ratio: Ratio for capital adequacy purposes		0.0300	0.0300
Stand-alone, TB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount		¥ 2,294,694	¥ 2,131,514
Total capital (to risk-weighted assets): Actual ratio		0.2191	0.2542
Tier 1 capital (to risk-weighted assets): Actual amount		¥ 2,066,480	¥ 1,867,723
Tier 1 capital (to risk-weighted assets): Actual ratio		0.1973	0.2227
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount		¥ 1,876,980	¥ 1,686,723
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio		0.1792	0.2011
Leverage Ratio: Actual amount		¥ 2,066,480	¥ 1,867,723
Leverage Ratio: Actual ratio		0.0895	0.0587
Total capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 837,567	¥ 670,714
Total capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0800	0.0800
Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 628,176	¥ 503,035
Tier 1 capital (to risk-weighted assets): Ratio for capital adequacy purposes		0.0600	0.0600
Common Equity Tier 1 capital (to risk-weighted assets): Amount for capital adequacy purposes		¥ 471,132	¥ 377,276
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required		4.50%	4.50%
Leverage Ratio: Amount for capital adequacy purposes		¥ 691,914	¥ 953,353
Leverage Ratio: Ratio for capital adequacy purposes		0.0300	0.0300
[1]	Effective March 31, 2016, the FSA’s capital conservation buffer, countercyclical buffer and G-SIB surcharge requirements became applicable to Japanese banking institutions with international operations conducted through foreign offices. As a result, in addition to the 4.50% minimum Common Equity Tier 1 capital ratio, MUFG is required to maintain a capital conservation buffer of 2.5% and a G-SIB surcharge of 1.5% as of March 31, 2020 and 2021, and the countercyclical buffer of 0.01% and 0.00% as of March 31, 2020 and 2021, respectively.

Regulatory Capital Requiremen_5

Regulatory Capital Requirements (Risk-adjusted Capital Amounts and Ratios, United States of America, MUAH) (Detail) - MUAH [Member] - U.S. Basel III [Member] $ in Millions		Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount		$ 16,871	$ 15,769
Tier 1 capital (to risk-weighted assets): Actual amount		15,823	15,086
Tier 1 capital (to quarterly average assets): Actual amount	[1]	15,823	15,086
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount		$ 15,823	$ 15,086
Total capital (to risk-weighted assets): Actual ratio		0.1629	0.1473
Tier 1 capital (to risk-weighted assets): Actual ratio		0.1528	0.1410
Tier 1 capital (to quarterly average assets): Actual ratio	[1]	0.0956	0.0888
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio		0.1528	0.1410
Total capital (to risk-weighted assets): Amount for minimum capital ratios required	[2]	$ 12,843	$ 11,237
Tier 1 capital (to risk-weighted assets): Amount for minimum capital ratios required	[2]	10,772	9,097
Tier 1 capital (to quarterly average assets): Amount for minimum capital ratios required	[1],[2]	6,623	6,792
Common Equity Tier 1 capital (to risk-weighted assets): Amount for minimum capital ratios required	[2]	$ 9,218	$ 7,492
Total capital (to risk-weighted assets): Ratio for minimum capital ratios required	[2]	0.12400	0.10500
Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required	[2]	0.10400	0.08500
Tier 1 capital (to quarterly average assets): Ratio for minimum capital ratios required	[1],[2]	0.04000	0.04000
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required	[2]	8.90%	7.00%
Capital conservation buffer		4.40%	2.50%
[1]	Excludes certain deductions.
[2]	The minimum capital requirement includes a capital conservation buffer of 2.5% at December 31, 2019 and 4.4% at December 31, 2020.

Regulatory Capital Requiremen_6

Regulatory Capital Requirements (Risk-adjusted Capital Amounts and Ratios, United States of America, MUB) (Detail) - BK (US) [Member] - U.S. Basel III [Member] $ in Millions		Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual amount		$ 15,629	$ 14,746
Tier 1 capital (to risk-weighted assets): Actual amount		14,634	14,115
Tier 1 capital (to quarterly average assets): Actual amount	[1]	14,634	14,115
Common Equity Tier 1 capital (to risk-weighted assets): Actual amount		$ 14,634	$ 14,115
Total capital (to risk-weighted assets): Actual ratio		0.1668	0.1511
Tier 1 capital (to risk-weighted assets): Actual ratio		0.1562	0.1447
Tier 1 capital (to quarterly average assets): Actual ratio	[1]	0.1112	0.1065
Common Equity Tier 1 capital (to risk-weighted assets): Actual ratio		0.1562	0.1447
Total capital (to risk-weighted assets): Amount for minimum capital ratios required	[2]	$ 9,836	$ 10,244
Tier 1 capital (to risk-weighted assets): Amount for minimum capital ratios required	[2]	7,963	8,293
Tier 1 capital (to quarterly average assets): Amount for minimum capital ratios required	[1],[2]	5,262	5,304
Common Equity Tier 1 capital (to risk-weighted assets): Amount for minimum capital ratios required	[2]	$ 6,557	$ 6,829
Total capital (to risk-weighted assets): Ratio for minimum capital ratios required	[2]	0.10500	0.10500
Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required	[2]	0.08500	0.08500
Tier 1 capital (to quarterly average assets): Ratio for minimum capital ratios required	[1],[2]	0.04000	0.04000
Common Equity Tier 1 capital (to risk-weighted assets): Ratio for minimum capital ratios required	[2]	7.00%	7.00%
Total capital (to risk-weighted assets): Amount OCC requires to be "well capitalized"		$ 9,368	$ 9,756
Tier 1 capital (to risk-weighted assets): Amount OCC requires to be "well capitalized"		7,494	7,805
Tier 1 capital (to quarterly average assets): Amount OCC requires to be "well capitalized"	[1]	6,577	6,629
Common Equity Tier 1 capital (to risk-weighted assets): Amount OCC requires to be "well capitalized"		$ 6,089	$ 6,342
Total capital (to risk-weighted assets): Ratios OCC requires to be "well capitalized"		0.1000	0.1000
Tier 1 capital (to risk-weighted assets): Ratios OCC requires to be "well capitalized"		0.0800	0.0800
Tier 1 capital (to quarterly average assets): Ratios OCC requires to be "well capitalized"	[1]	0.0500	0.0500
Common Equity Tier 1 capital (to risk-weighted assets): Ratios OCC requires to be "well capitalized"		6.50%	6.50%
Capital conservation buffer			2.50%
[1]	Excludes certain deductions.
[2]	Beginning January 1, 2019, the minimum capital requirement includes a capital conservation buffer of 2.5%.

Earnings Per Common Share App_3

Earnings Per Common Share Applicable to Common Shareholders of MUFG (Reconciliations of Net Income and Weighted Average Number of Common Shares Outstanding Used for Computation of Basic EPS to Adjusted Amounts for Computation of Diluted EPS) (Detail) - JPY (¥) ¥ / shares in Units, shares in Thousands, ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income (Numerator):
Net income attributable to Mitsubishi UFJ Financial Group		¥ 1,117,298	¥ 305,955	¥ 718,645
Effect of dilutive instruments:
Stock acquisition rights and restricted stock units—Morgan Stanley		(4,159)	(2,861)	(3,745)
Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group and assumed conversions		¥ 1,113,139	¥ 303,094	¥ 714,900
Shares (Denominator):
Weighted average common shares outstanding		12,859,737	12,912,790	13,058,698
Effect of dilutive instruments:
Stock acquisition rights and the common shares of MUFG under the Board Incentive Plan	[1]		166	484
Weighted average common shares for diluted computation		12,859,737	12,912,956	13,059,182
Basic earnings per common share:
Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group		¥ 86.88	¥ 23.69	¥ 55.03
Diluted earnings per common share:
Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group	[1]	¥ 86.56	¥ 23.47	¥ 54.74
[1]	For the fiscal years ended March 31, 2019, 2020 and 2021, 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.

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Detail) - JPY (¥) ¥ in Billions		12 Months Ended
		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Cash Flow Hedge:
Derivative, Notional Amount	[1]	¥ 1,551,800		¥ 1,803,700
Credit Derivatives:
Carrying value of credit protection, offsetting with purchased protection with identical underlying referenced entities, in approximate		66		65
Notional amounts of credit protection, offsetting with purchased protection with identical underlying referenced entities, in approximate		4,097		3,544
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		700		600
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a liability position, posted collateral, in approximate		227		152
Additional collateral amount which could be requested if the MUFG Group's debt falls below investment grade		63		58
Early termination amount which could be requested if the MUFG Group's debt falls below investment grade		92		80
Interest Rate Contracts [Member]
Cash Flow Hedge:
Derivative, Notional Amount	[1]	¥ 1,308,400		¥ 1,553,500
MUAH [Member]
Cash Flow Hedge:
Approximate losses expected to be reclassified to net interest income during the twelve months ending December 31, 2020			¥ 11.3
MUAH [Member] | Cash Flow Hedging [Member] | Weighted Average [Member]
Cash Flow Hedge:
Remaining life of the active cash flow hedges, in years			2 years 8 months 12 days
MUAH [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Interest Rates From Variable Rate Loans [Member]
Cash Flow Hedge:
Derivative, Notional Amount			¥ 983.3
MUAH [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Interest Rate On LIBOR indexed short-term borrowings [Member]
Cash Flow Hedge:
Derivative, Notional Amount			¥ 0.9
[1]	Includes both written and purchased positions.

Derivative Financial Instrume_4

Derivative Financial Instruments (Notional Amounts of Derivative Contracts) (Detail) - JPY (¥) ¥ in Trillions		Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Notional amounts of derivatives	[1]	¥ 1,551.8	¥ 1,803.7
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	1,308.4	1,553.5
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	222	230.2
Equity Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	8	8.1
Commodity Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	0.1	0.1
Credit Derivatives [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	9.8	8.7
Other [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	¥ 3.5	¥ 3.1
[1]	Includes both written and purchased positions.

Derivative Financial Instrume_5

Derivative Financial Instruments (Fair Value Information on Derivative Instruments Recorded on Consolidated Balance Sheets) (Detail) - JPY (¥) ¥ in Billions		Mar. 31, 2021	Mar. 31, 2020
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	¥ 11,997	¥ 14,958
Fair value of derivative liabilities	[1],[2],[3]	11,714	14,034
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	7,718	10,847
Fair value of derivative liabilities	[1],[2],[3]	7,361	10,205
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	3,910	3,734
Fair value of derivative liabilities	[1],[2],[3]	4,027	3,608
Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	231	236
Fair value of derivative liabilities	[1],[2],[3]	237	277
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	27	26
Fair value of derivative liabilities	[1],[2],[3]	27	26
Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	94	114
Fair value of derivative liabilities	[1],[2],[3]	109	95
Other [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3],[4]	17	1
Fair value of derivative liabilities	[1],[2],[3],[4]	(47)	(177)
Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	11,997	14,958
Fair value of derivative liabilities	[1],[2],[5]	11,709	14,030
Not Designated as Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	7,718	10,847
Fair value of derivative liabilities	[1],[2],[5]	7,361	10,205
Not Designated as Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	3,910	3,734
Fair value of derivative liabilities	[1],[2],[5]	4,022	3,604
Not Designated as Hedging Instruments [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	231	236
Fair value of derivative liabilities	[1],[2],[5]	237	277
Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	27	26
Fair value of derivative liabilities	[1],[2],[5]	27	26
Not Designated as Hedging Instruments [Member] | Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	94	114
Fair value of derivative liabilities	[1],[2],[5]	109	95
Not Designated as Hedging Instruments [Member] | Other [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[4],[5]	17	1
Fair value of derivative liabilities	[1],[2],[4],[5]	(47)	(177)
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]	5	4
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]
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]	5	4
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] | Other [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[4],[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 31.
[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 mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, 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 and liabilities except for (6).
[6]	The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by certain subsidiaries. The derivative instruments which are designated as hedging instruments are presented in Other assets or Other liabilities on the accompanying 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		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)		¥ (510)	¥ (593)	¥ (378)
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)		70	(173)	6
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)		(91)	(429)	(347)
Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)		(269)	30	80
Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)		(53)	15	(40)
Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	[1]	(167)	(36)	(77)
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)		(80)	(434)	(354)
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)		(91)	(429)	(347)
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] | Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	[1]	11	(5)	(7)
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)		(430)	(159)	(24)
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)		70	(173)	6
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)		(269)	30	80
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)		(53)	15	(40)
Trading Account Profits (Losses)—Net [Member] | Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses (Not designated as hedging instruments)	[1]	¥ (178)	¥ (31)	¥ (70)
[1]	Other mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, Deposits and Long-term debt.

Derivative Financial Instrume_7

Derivative Financial Instruments (Protection Sold Through Credit Default Swaps) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021		Mar. 31, 2020
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		¥ 517,053		¥ 448,290
Maximum potential/Notional amount, Expiring in 1-5 years		3,130,734		2,919,354
Maximum potential/Notional amount, Expiring over 5 years		805,026		563,987
Maximum potential/Notional amount, Total		4,452,813		3,931,631
Credit derivative (asset) liability at fair value	[1]	(69,286)		(68,903)
Protection sold [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		517,053		448,290
Maximum potential/Notional amount, Expiring in 1-5 years		3,114,128		2,919,354
Maximum potential/Notional amount, Expiring over 5 years		805,026		563,987
Maximum potential/Notional amount, Total		4,436,207		3,931,631
Credit derivative (asset) liability at fair value	[1]	(69,343)		(68,903)
Protection sold [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		379,092		399,994
Maximum potential/Notional amount, Expiring in 1-5 years		2,548,775		2,411,724
Maximum potential/Notional amount, Expiring over 5 years		775,041		543,721
Maximum potential/Notional amount, Total		3,702,908		3,355,439
Credit derivative (asset) liability at fair value	[1]	(62,506)		(60,515)
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]	294,312		303,870
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	2,235,390		2,125,006
Maximum potential/Notional amount, Expiring over 5 years	[2]	715,896		494,040
Maximum potential/Notional amount, Total	[2]	3,245,598		2,922,916
Credit derivative (asset) liability at fair value	[1],[2]	(67,707)		(63,855)
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		84,780		93,671
Maximum potential/Notional amount, Expiring in 1-5 years		311,702		279,892
Maximum potential/Notional amount, Expiring over 5 years		59,145		49,681
Maximum potential/Notional amount, Total		455,627		423,244
Credit derivative (asset) liability at fair value	[1]	5,284		3,358
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				2,453
Maximum potential/Notional amount, Expiring in 1-5 years		1,683		6,826
Maximum potential/Notional amount, Expiring over 5 years				0
Maximum potential/Notional amount, Total		1,683		9,279
Credit derivative (asset) liability at fair value	[1]	(83)		(18)
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		137,961		48,296
Maximum potential/Notional amount, Expiring in 1-5 years		565,353		507,630
Maximum potential/Notional amount, Expiring over 5 years		29,985		20,266
Maximum potential/Notional amount, Total		733,299		576,192
Credit derivative (asset) liability at fair value	[1]	(6,837)		(8,388)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[2]	43,000		20,000
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	470,063		210,602
Maximum potential/Notional amount, Expiring over 5 years	[2]	29,133		14,950
Maximum potential/Notional amount, Total	[2]	542,196		245,552
Credit derivative (asset) liability at fair value	[1],[2]	(4,753)		(1,823)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | Non-investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		35,427		0
Maximum potential/Notional amount, Expiring in 1-5 years		65,319		106,630
Maximum potential/Notional amount, Expiring over 5 years				0
Maximum potential/Notional amount, Total		100,746		106,630
Credit derivative (asset) liability at fair value	[1]	(1,165)		(1,360)
Protection sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | Not Rated [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		59,534		28,296
Maximum potential/Notional amount, Expiring in 1-5 years		29,971		190,398
Maximum potential/Notional amount, Expiring over 5 years		852		5,316
Maximum potential/Notional amount, Total		90,357		224,010
Credit derivative (asset) liability at fair value	[1]	(919)		(5,205)
Other Credit Derivatives Sold [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less			[2],[3]
Maximum potential/Notional amount, Expiring in 1-5 years		16,606	[2],[3]
Maximum potential/Notional amount, Expiring over 5 years			[2],[3]
Maximum potential/Notional amount, Total		16,606	[2],[3]
Credit derivative (asset) liability at fair value	[1]	¥ 57	[2],[3]
[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 guarantees for exposures held by the counterparty under interest rate swaps and other types of derivative contracts.

Obligations under Guarantees _3

Obligations under Guarantees and Other Off-balance Sheet Instruments (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Guarantor Obligations [Line Items]
Amount of Obligations under Guarantees	¥ 56,443,000	¥ 79,222,000
Contractual maturities of guarantees mainly comprised of guarantees of housing loans, in years	over 5 years
Carrying amounts of the liabilities related to guarantees and similar instruments	¥ 857,862	1,130,522
Allowance for off-balance sheet instruments	¥ 27,688	30,911
Lending-related commitments which expire within one year, in approximate percentage	67.00%
Lending-related commitments which expire from one year to five years, in approximate percentage	30.00%
Lending-related commitments which expire after five years, in approximate percentage	3.00%
Portion Syndicated out to Third Parties [Member]
Guarantor Obligations [Line Items]
Amount of Obligations under Guarantees	¥ 499,000	455,800
Options Sold [Member]
Guarantor Obligations [Line Items]
Amount of Obligations under Guarantees	¥ 819,739	¥ 1,090,921

Obligations under Guarantees _4

Obligations under Guarantees and Other Off-balance Sheet Instruments (Contractual or Notional Amounts of Guarantees with Amount by Expiration Period) (Detail) - JPY (¥) ¥ in Billions		Mar. 31, 2021	Mar. 31, 2020
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total		¥ 56,443	¥ 79,222
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less		26,696	48,050
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years		17,309	16,568
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years		12,438	14,604
Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total		4,055	4,098
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less		3,174	3,109
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years		698	763
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years		183	226
Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total		3,193	3,058
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less		2,315	2,160
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years		755	738
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years		123	160
Derivative Instruments [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total	[1]	38,499	58,836
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less	[1]	15,534	36,021
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years	[1]	15,104	14,543
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years	[1]	7,861	8,272
Liabilities of Trust Accounts [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total		10,656	13,142
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less		5,667	6,752
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years		718	451
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years		4,271	5,939
Others [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total		40	88
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less		6	8
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years		34	73
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years			¥ 7
[1]	Credit derivatives sold by the MUFG Group are excluded from this presentation.

Obligations under Guarantees _5

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		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		¥ 56,443	¥ 79,222
Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		4,055	4,098
Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3,193	3,058
Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		7,248	7,156
Normal [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3,929	3,984
Normal [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3,092	2,904
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		¥ 7,021	6,888
Close Watch [Member] | Minimum [Member]
Guarantor Obligations [Line Items]
Accruing loans contractually past due, in day		90 days
Close Watch [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade	[1]	¥ 108	93
Close Watch [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade	[1]	70	96
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]	178	189
Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade	[2]	15	17
Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade	[2]	3	36
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	[2]	18	53
Not Rated [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		3	4
Not Rated [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Amount by borrower grade		28	22
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		¥ 31	¥ 26
[1]	Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons.
[2]	Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment, suspension of business, voluntary liquidation or filing for legal liquidation.

Obligations under Guarantees _6

Obligations under Guarantees and Other Off-balance Sheet Instruments (Contractual Amounts with Regard to Other Off-balance Sheet Instruments) (Detail) - JPY (¥) ¥ in Billions	Mar. 31, 2021	Mar. 31, 2020
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	¥ 84,614	¥ 76,398
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	835	757
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	281	247
Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with regard to other off-balance sheet instruments		¥ 5

Variable Interest Entities (Ass

Variable Interest Entities (Assets and Liabilities of Consolidated Variable Interest Entities) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Variable Interest Entity [Line Items]
Total assets	¥ 353,824,625	¥ 331,753,283	¥ 305,228,899
Consolidated assets, Cash and due from banks	49,977,480	33,283,032
Consolidated assets, Interest-earning deposits in other banks	53,346,721	45,266,680
Consolidated assets, Trading account assets	44,444,379	47,504,058
Consolidated assets, Investment securities	57,244,496	43,751,242
Consolidated assets, Loans	114,370,472	117,377,199
Total liabilities	337,580,071	316,008,767
Consolidated liabilities, Deposits	229,206,936	203,954,528
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Total assets	18,128,416	18,847,661
Consolidated assets, Cash and due from banks	2,698	846
Consolidated assets, Interest-earning deposits in other banks	30,422	30,047
Consolidated assets, Trading account assets	959,001	695,069
Consolidated assets, Investment securities	1,727,292	1,804,459
Consolidated assets, Loans	15,247,928	16,072,595
Consolidated assets, All other assets	161,075	244,645
Total liabilities	594,819	598,152
Consolidated liabilities, Deposits
Consolidated liabilities, Other short-term borrowings	33,599	30,831
Consolidated liabilities, Long-term debt	457,763	465,352
Consolidated liabilities, All other liabilities	103,457	101,969
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member]
Variable Interest Entity [Line Items]
Total assets	26,249,510	25,725,510
Consolidated assets, Cash and due from banks	112,941	104,461
Consolidated assets, Interest-earning deposits in other banks	62,112	53,474
Consolidated assets, Trading account assets	964,893	705,661
Consolidated assets, Investment securities	2,246,853	2,094,026
Consolidated assets, Loans	22,678,094	22,502,475
Consolidated assets, All other assets	184,617	265,413
Total liabilities	25,821,760	25,108,870
Consolidated liabilities, Deposits	7,826,959	6,743,261
Consolidated liabilities, Other short-term borrowings	4,114,024	4,415,647
Consolidated liabilities, Long-term debt	11,605,353	11,839,934
Consolidated liabilities, All other liabilities	2,275,424	2,110,028
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Asset-backed Conduits [Member]
Variable Interest Entity [Line Items]
Total assets	5,986,887	6,263,082
Consolidated assets, Cash and due from banks	109,439	102,781
Consolidated assets, Interest-earning deposits in other banks	40,061	31,625
Consolidated assets, Trading account assets	5,433	12,989
Consolidated assets, Investment securities	1,015,434	1,195,283
Consolidated assets, Loans	4,800,221	4,913,939
Consolidated assets, All other assets	16,299	6,465
Total liabilities	5,989,188	6,253,318
Consolidated liabilities, Other short-term borrowings	4,058,248	4,327,685
Consolidated liabilities, Long-term debt	1,461,043	1,478,921
Consolidated liabilities, All other liabilities	469,897	446,712
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Total assets	374,324	493,757
Consolidated assets, Interest-earning deposits in other banks	15,171	16,482
Consolidated assets, Trading account assets	240,327	314,074
Consolidated assets, Investment securities	41,512	34,121
Consolidated assets, All other assets	77,314	129,080
Total liabilities	15,039	15,817
Consolidated liabilities, Long-term debt	5,831	5,546
Consolidated liabilities, All other liabilities	9,208	10,271
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Special Purpose Entities Created for Structured Financing [Member]
Variable Interest Entity [Line Items]
Total assets	175,630	204,047
Consolidated assets, Interest-earning deposits in other banks	2,058	2,658
Consolidated assets, Trading account assets	4,645
Consolidated assets, Loans	113,943	119,348
Consolidated assets, All other assets	54,984	82,041
Total liabilities	97,226	114,357
Consolidated liabilities, Long-term debt	84,973	112,474
Consolidated liabilities, All other liabilities	12,253	1,883
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Repackaged Instruments [Member]
Variable Interest Entity [Line Items]
Total assets	281,331	249,529
Consolidated assets, Cash and due from banks	3,179	1,330
Consolidated assets, Trading account assets	73,914	42,052
Consolidated assets, Investment securities	118,199	118,776
Consolidated assets, Loans	85,782	86,859
Consolidated assets, All other assets	257	512
Total liabilities	284,795	251,056
Consolidated liabilities, Other short-term borrowings	21,343	65,965
Consolidated liabilities, Long-term debt	195,987	163,833
Consolidated liabilities, All other liabilities	67,465	21,258
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Securitization of MUFG Group's Assets [Member]
Variable Interest Entity [Line Items]
Total assets	10,358,628	10,956,261
Consolidated assets, Interest-earning deposits in other banks	996
Consolidated assets, Loans	10,339,273	10,933,580
Consolidated assets, All other assets	18,359	22,681
Total liabilities	10,367,099	10,924,830
Consolidated liabilities, Other short-term borrowings	31,000	16,008
Consolidated liabilities, Long-term debt	9,839,204	10,077,839
Consolidated liabilities, All other liabilities	496,895	830,983
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Trust Arrangements [Member]
Variable Interest Entity [Line Items]
Total assets	9,029,390	7,527,539
Consolidated assets, Interest-earning deposits in other banks		654
Consolidated assets, Trading account assets	623,466	336,546
Consolidated assets, Investment securities	1,071,708	745,846
Consolidated assets, Loans	7,334,215	6,441,864
Consolidated assets, All other assets	1	2,629
Total liabilities	9,029,272	7,522,190
Consolidated liabilities, Deposits	7,826,959	6,743,261
Consolidated liabilities, All other liabilities	1,202,313	778,929
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Other [Member]
Variable Interest Entity [Line Items]
Total assets	43,320	31,295
Consolidated assets, Cash and due from banks	323	350
Consolidated assets, Interest-earning deposits in other banks	3,826	2,055
Consolidated assets, Trading account assets	17,108
Consolidated assets, Loans	4,660	6,885
Consolidated assets, All other assets	17,403	22,005
Total liabilities	39,141	27,302
Consolidated liabilities, Other short-term borrowings	3,433	5,989
Consolidated liabilities, Long-term debt	18,315	1,321
Consolidated liabilities, All other liabilities	17,393	19,992
Consolidated VIEs [Member] | Amounts Eliminated in Consolidation [Member]
Variable Interest Entity [Line Items]
Total assets	(8,121,094)	(6,877,849)
Consolidated assets, Cash and due from banks	(110,243)	(103,615)
Consolidated assets, Interest-earning deposits in other banks	(31,690)	(23,427)
Consolidated assets, Trading account assets	(5,892)	(10,592)
Consolidated assets, Investment securities	(519,561)	(289,567)
Consolidated assets, Loans	(7,430,166)	(6,429,880)
Consolidated assets, All other assets	(23,542)	(20,768)
Total liabilities	(14,679,458)	(15,045,398)
Consolidated liabilities, Deposits		(703)
Consolidated liabilities, Other short-term borrowings	(2,422,978)	(2,526,893)
Consolidated liabilities, Long-term debt	(11,144,547)	(11,374,581)
Consolidated liabilities, All other liabilities	(1,111,933)	(1,143,221)
Consolidated VIEs [Member] | Amount of Liabilities with Recourse to General Credit of MUFG Group [Member]
Variable Interest Entity [Line Items]
Total liabilities	(10,547,483)	(9,465,320)
Consolidated liabilities, Deposits	(7,826,959)	(6,742,558)
Consolidated liabilities, Other short-term borrowings	(1,657,447)	(1,857,923)
Consolidated liabilities, Long-term debt	(3,043)	(1)
Consolidated liabilities, All other liabilities	¥ (1,060,034)	¥ (864,838)

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	Mar. 31, 2021	Mar. 31, 2020
Variable Interest Entity [Line Items]
Total assets	¥ 241,164,323	¥ 183,548,754
Maximum exposure	18,790,574	17,327,744
On-balance sheet assets, Total assets	14,939,167	14,519,503
On-balance sheet assets, Trading account assets	1,824,640	1,416,760
On-balance sheet assets, Investment securities	4,268,142	4,421,833
On-balance sheet assets, Loans	8,690,937	8,457,932
On-balance sheet assets, All other assets	155,448	222,978
On-balance sheet liabilities, Total liabilities	179,568	404,430
On-balance sheet liabilities, All other liabilities	179,568	404,430
Asset-backed Conduits [Member]
Variable Interest Entity [Line Items]
Total assets	25,491,847	27,700,099
Maximum exposure	5,606,965	5,836,895
On-balance sheet assets, Total assets	4,211,342	4,797,551
On-balance sheet assets, Trading account assets	277	190
On-balance sheet assets, Investment securities	1,598,992	1,737,979
On-balance sheet assets, Loans	2,612,073	3,059,382
Investment Funds [Member]
Variable Interest Entity [Line Items]
Total assets	102,840,486	55,644,434
Maximum exposure	2,646,071	1,918,403
On-balance sheet assets, Total assets	2,288,210	1,712,037
On-balance sheet assets, Trading account assets	538,190	437,858
On-balance sheet assets, Investment securities	501,434	525,022
On-balance sheet assets, Loans	1,213,179	724,253
On-balance sheet assets, All other assets	35,407	24,904
On-balance sheet liabilities, Total liabilities	114,911	356,679
On-balance sheet liabilities, All other liabilities	114,911	356,679
Special Purpose Entities Created for Structured Financing [Member]
Variable Interest Entity [Line Items]
Total assets	38,771,947	37,026,192
Maximum exposure	4,409,839	3,601,834
On-balance sheet assets, Total assets	3,254,145	2,764,156
On-balance sheet assets, Trading account assets	476,784	392,588
On-balance sheet assets, Investment securities	25,234	35,774
On-balance sheet assets, Loans	2,745,441	2,317,128
On-balance sheet assets, All other assets	6,686	18,666
On-balance sheet liabilities, Total liabilities	10,447	6,058
On-balance sheet liabilities, All other liabilities	10,447	6,058
Repackaged Instruments [Member]
Variable Interest Entity [Line Items]
Total assets	8,604,182	8,215,327
Maximum exposure	3,088,564	3,030,263
On-balance sheet assets, Total assets	3,008,695	2,931,617
On-balance sheet assets, Trading account assets	611,245	394,478
On-balance sheet assets, Investment securities	2,142,482	2,123,058
On-balance sheet assets, Loans	204,332	361,184
On-balance sheet assets, All other assets	50,636	52,897
On-balance sheet liabilities, Total liabilities	29,478
On-balance sheet liabilities, All other liabilities	29,478
Other [Member]
Variable Interest Entity [Line Items]
Total assets	65,455,861	54,962,702
Maximum exposure	3,039,135	2,940,349
On-balance sheet assets, Total assets	2,176,775	2,314,142
On-balance sheet assets, Trading account assets	198,144	191,646
On-balance sheet assets, Loans	1,915,912	1,995,985
On-balance sheet assets, All other assets	62,719	126,511
On-balance sheet liabilities, Total liabilities	24,732	41,693
On-balance sheet liabilities, All other liabilities	¥ 24,732	¥ 41,693

Contingent Liabilities (Narrati

Contingent Liabilities (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Allowance for repayment of excess interest	¥ 24,943	¥ 29,438
Provision (reversal) for repayment of excess interest recognized on Equity in earnings of equity method investee	¥ 0	¥ 7,800	¥ 15,632

Fees and Commissions Income (De

Fees and Commissions Income (Details of Fees and Commissions Income) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		¥ 1,527,283	¥ 1,502,052	¥ 1,438,578
Deposits [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		50,131	53,684	52,624
Remittances and Transfers [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		165,288	169,407	168,756
Foreign Trading Business [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		79,353	66,025	73,176
Credit card business [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		199,625	238,112	225,877
Security-related Services [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		244,017	221,494	233,448
Administration and management services for investment funds [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		235,497	184,559	147,597
Trust fees [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		125,658	119,919	115,002
Guarantee fees [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income	[1]	43,889	46,322	44,962
Insurance Commissions [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		42,117	44,415	46,918
Real Estate [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income		48,110	49,764	45,160
Others [Member]
Disaggregation of Contract Revenue [Line Items]
Fees and commissions income	[2]	¥ 293,598	¥ 308,351	¥ 285,058
[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.

Trading Account Profits and L_3

Trading Account Profits and Losses (Net Trading Gains (Losses)) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Trading Account Profits And Losses [Abstract]
Interest rate and other derivative contracts		¥ (429,586)	¥ (159,045)	¥ (24,031)
Trading account securities, excluding derivatives		19,218	924,418	192,931
Trading account profits (losses)—net		(410,368)	765,373	168,900
Foreign exchange derivative contracts	[1]	(79,559)	(434,052)	(354,401)
Net trading gains (losses)		¥ (489,927)	¥ 331,321	¥ (185,501)
[1]	Losses on foreign exchange derivative contracts are included in Foreign exchange gains (losses)—net in the accompanying consolidated statements of income. Foreign exchange gains (losses)—net in the accompanying consolidated statements of income are also comprised of foreign exchange gains (losses) other than derivative contracts and foreign exchange gains (losses) related to the fair value option.

Business Segments (Narrative) (

Business Segments (Narrative) (Detail) - JPY (¥) ¥ in Billions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)	¥ 9	¥ 19.1
Operating Segments [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)	13	14.2
Operating Segments [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)	12.4	20.2
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)	1.7	2.8
Operating Segments [Member] | Customer Business [Member] | Global Markets Business Group [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)		46.3
Operating Segments [Member] | Global Markets Business Group [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)	40.2
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Modification impact in operating profits (losses)	¥ 25.5	¥ 33.8

Business Segments (Financial In

Business Segments (Financial Information by Business Segment) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Business segment information
Net revenue		¥ 4,082,300	¥ 4,054,600	¥ 3,799,100
Net interest income		2,004,094	2,242,799	2,295,398
Operating expenses		2,833,700	2,879,600	2,726,800
Operating profit (loss)		1,248,600	1,175,000	1,072,300
BK and TB [Member]
Business segment information
Net revenue	[1]	1,882,800	1,878,200	1,861,000
Net interest income		976,400	930,300	1,145,200
Net fees		606,300	605,400	620,900
Other		300,100	342,500	94,900
Other than BK and TB [Member]
Business segment information
Net revenue		2,199,500	2,176,400	1,938,100
Operating Segments [Member] | Customer Business [Member]
Business segment information
Net revenue		3,452,300	3,498,800	3,374,500
Operating expenses		2,438,600	2,517,100	2,397,700
Operating profit (loss)		1,013,700	981,700	976,800
Operating Segments [Member] | Customer Business [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	1,463,400	1,527,000	1,526,900
Net interest income		729,200	754,400	753,300
Net fees		677,400	675,300	683,900
Other		56,800	97,300	89,700
Operating Segments [Member] | Customer Business [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		1,988,900	1,971,800	1,847,600
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member]
Business segment information
Net revenue		1,389,400	1,485,500	1,502,500
Operating expenses		1,130,400	1,195,900	1,220,900
Operating profit (loss)		259,000	289,600	281,600
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	645,100	706,600	718,900
Net interest income		405,200	444,400	458,200
Net fees		216,400	231,800	229,800
Other		23,500	30,400	30,900
Operating Segments [Member] | Customer Business [Member] | Retail & Commercial Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		744,300	778,900	783,600
Operating Segments [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member]
Business segment information
Net revenue		559,900	572,700	569,600
Operating expenses		319,300	324,400	319,500
Operating profit (loss)		240,600	248,300	250,100
Operating Segments [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	448,800	439,100	436,900
Net interest income		183,800	185,700	175,800
Net fees		216,800	203,200	202,900
Other		48,200	50,200	58,200
Operating Segments [Member] | Customer Business [Member] | Japanese Corporate & Investment Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		111,100	133,600	132,700
Operating Segments [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member]
Business segment information
Net revenue		426,300	402,200	417,400
Operating expenses		269,800	260,800	254,900
Operating profit (loss)		156,500	141,400	162,500
Operating Segments [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	269,300	287,100	279,200
Net interest income		133,200	121,400	120,600
Net fees		150,200	148,100	158,000
Other		(14,100)	17,600	600
Operating Segments [Member] | Customer Business [Member] | Global Corporate & Investment Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		157,000	115,100	138,200
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member]
Business segment information
Net revenue		783,200	795,400	682,000
Operating expenses		509,000	564,300	477,800
Operating profit (loss)		274,200	231,100	204,200
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	800	(400)	(1,300)
Net interest income		1,500	400	(1,300)
Net fees
Other		(700)	(800)
Operating Segments [Member] | Customer Business [Member] | Global Commercial Banking Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		782,400	795,800	683,300
Operating Segments [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member]
Business segment information
Net revenue		293,500	243,000	203,000
Operating expenses		210,100	171,700	124,600
Operating profit (loss)		83,400	71,300	78,400
Operating Segments [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	99,400	94,600	93,200
Net interest income		5,500	2,500
Net fees		94,000	92,200	93,200
Other		(100)	(100)
Operating Segments [Member] | Customer Business [Member] | Asset Management & Investor Services Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		194,100	148,400	109,800
Operating Segments [Member] | Global Markets Business Group [Member]
Business segment information
Net revenue		634,800	536,000	436,000
Operating expenses		234,000	233,200	226,000
Operating profit (loss)		400,800	302,800	210,000
Operating Segments [Member] | Global Markets Business Group [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	389,000	319,300	259,800
Net interest income		213,100	129,500	201,100
Net fees		(4,300)	(14,800)	(16,600)
Other		180,200	204,600	75,300
Operating Segments [Member] | Global Markets Business Group [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		245,800	216,700	176,200
Business Segment, Other [Member]
Business segment information
Net revenue		(4,800)	19,800	(11,400)
Operating expenses		161,100	129,300	103,100
Operating profit (loss)		(165,900)	(109,500)	(114,500)
Business Segment, Other [Member] | BK and TB [Member]
Business segment information
Net revenue	[1]	30,400	31,900	74,300
Net interest income		34,100	46,400	190,800
Net fees		(66,800)	(55,100)	(46,400)
Other		63,100	40,600	(70,100)
Business Segment, Other [Member] | Other than BK and TB [Member]
Business segment information
Net revenue		¥ (35,200)	¥ (12,100)	¥ (85,700)
[1]	“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 Consolidated Statements of Income) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	¥ 1,248,600	¥ 1,175,000	¥ 1,072,300
Provision for credit losses	(484,210)	(321,713)	(34,330)
Trading account profits (losses)—net	(410,368)	765,373	168,900
Foreign exchange gains (losses)—net	99,337	(281,790)	(95,987)
Equity in earnings of equity method investees—net	355,730	282,712	209,732
Impairment of goodwill	(147,564)	(383,810)
Impairment of intangible assets	(21,680)	(3,732)	(118,108)
Reversal of (provision for) off-balance sheet credit instruments	56,749	62,279	(38,463)
Income before income tax expense	1,608,342	433,220	870,842
Reconciliation [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	1,249,000	1,175,000	1,072,000
Provision for credit losses	(484,000)	(322,000)	(34,000)
Trading account profits (losses)—net	(678,000)	920,000	182,000
Equity investment securities gains (losses)—net	1,480,000	(618,000)	(305,000)
Debt investment securities losses—net	(129,000)	(403,000)	(3,000)
Foreign exchange gains (losses)—net	9,000	(145,000)	47,000
Equity in earnings of equity method investees—net	356,000	283,000	210,000
Impairment of goodwill	(148,000)	(384,000)
Impairment of intangible assets	(22,000)	(4,000)	(118,000)
Reversal of (provision for) off-balance sheet credit instruments	57,000	62,000	(38,000)
Other—net	(82,000)	(131,000)	(142,000)
Income before income tax expense	¥ 1,608,000	¥ 433,000	¥ 871,000

Foreign Activities (Estimated F

Foreign Activities (Estimated Financial Information by Geographic Areas) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Foreign Activities Disclosure [Line Items]
Total revenue	[1]	¥ 5,909,783	¥ 5,802,838	¥ 5,408,623
Total expense	[2]	4,301,441	5,369,618	4,537,781
Income (loss) before income tax expense (benefit)		1,608,342	433,220	870,842
Net income (loss) attributable to Mitsubishi UFJ Financial Group		1,117,298	305,955	718,645
Total assets at end of fiscal year		353,824,625	331,753,283	305,228,899
Domestic, Japan [Member]
Foreign Activities Disclosure [Line Items]
Total revenue	[1]	3,348,733	1,596,794	1,886,469
Total expense	[2]	2,316,323	2,565,895	2,204,147
Income (loss) before income tax expense (benefit)		1,032,410	(969,101)	(317,678)
Net income (loss) attributable to Mitsubishi UFJ Financial Group		627,138	(1,001,477)	(345,148)
Total assets at end of fiscal year		240,603,939	207,532,337	194,070,495
Foreign, United States of America [Member]
Foreign Activities Disclosure [Line Items]
Total revenue	[1]	741,137	2,223,984	1,637,569
Total expense	[2]	713,441	1,051,164	1,012,978
Income (loss) before income tax expense (benefit)		27,696	1,172,820	624,591
Net income (loss) attributable to Mitsubishi UFJ Financial Group		(231,116)	1,113,913	573,698
Total assets at end of fiscal year		49,478,851	60,587,867	49,987,389
Foreign, Europe [Member]
Foreign Activities Disclosure [Line Items]
Total revenue	[1]	356,112	89,412	222,267
Total expense	[2]	263,753	218,623	173,934
Income (loss) before income tax expense (benefit)		92,359	(129,211)	48,333
Net income (loss) attributable to Mitsubishi UFJ Financial Group		74,230	(140,372)	50,877
Total assets at end of fiscal year		21,126,639	19,099,410	21,535,278
Foreign, Asia / Oceania Excluding Japan [Member]
Foreign Activities Disclosure [Line Items]
Total revenue	[1]	1,134,233	1,326,426	1,157,946
Total expense	[2]	889,494	1,174,200	892,729
Income (loss) before income tax expense (benefit)		244,739	152,226	265,217
Net income (loss) attributable to Mitsubishi UFJ Financial Group		366,880	142,568	214,582
Total assets at end of fiscal year		31,368,443	30,845,864	27,992,986
Foreign, Other Areas [Member]
Foreign Activities Disclosure [Line Items]
Total revenue	[1],[3]	329,568	566,222	504,372
Total expense	[2],[3]	118,430	359,736	253,993
Income (loss) before income tax expense (benefit)	[3]	211,138	206,486	250,379
Net income (loss) attributable to Mitsubishi UFJ Financial Group	[3]	280,166	191,323	224,636
Total assets at end of fiscal year	[3]	¥ 11,246,753	¥ 13,687,805	¥ 11,642,751
[1]	Total revenue is comprised of Interest income and Non-interest income.
[2]	Total expense is comprised of Interest expense, Provision for (reversal of) credit losses and Non-interest expense.
[3]	Other areas primarily include Canada, Latin America, the Caribbean and the Middle East.

Foreign Activities (Analysis of

Foreign Activities (Analysis of Certain Asset and Liability Accounts Related to Foreign Activities) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Foreign Activities Disclosure [Line Items]
Cash and due from banks		¥ 49,977,480	¥ 33,283,032
Interest-earning deposits in other banks		53,346,721	45,266,680
Cash, due from banks and interest-earning deposits in other banks		103,324,201	78,549,712	¥ 74,571,260
Trading account assets		44,444,379	47,504,058
Investment securities		57,244,496	43,751,242
Loans—net of unearned income, unamortized premiums and deferred loan fees	[1]	115,718,863	118,186,739
Deposits		229,206,936	203,954,528
Funds borrowed:
Call money, funds purchased		2,353,830	3,668,922
Payables under repurchase agreements		24,567,943	31,849,915
Payables under securities lending transactions		842,590	1,016,874
Other short-term borrowings		14,187,723	16,055,482
Long-term debt		35,157,651	27,926,763
Trading account liabilities		12,017,553	14,767,433
Foreign [Member]
Foreign Activities Disclosure [Line Items]
Cash and due from banks		1,090,501	971,870
Interest-earning deposits in other banks		12,377,887	12,662,558
Cash, due from banks and interest-earning deposits in other banks		13,468,388	13,634,428
Trading account assets		28,525,243	31,374,451
Investment securities		8,694,138	9,040,512
Loans—net of unearned income, unamortized premiums and deferred loan fees		47,333,878	53,079,542
Deposits		55,145,437	49,291,478
Funds borrowed:
Call money, funds purchased		323,066	276,040
Payables under repurchase agreements		10,974,238	13,476,026
Payables under securities lending transactions		130,380	176,998
Other short-term borrowings		3,474,821	4,733,138
Long-term debt		2,421,267	2,733,242
Total		17,323,772	21,395,444
Trading account liabilities		¥ 5,575,956	¥ 6,575,570
[1]	The above table includes loans held for sale of ¥344,790 million and ¥353,095 million at March 31, 2020 and 2021, respectively.

Fair Value (Assets and Liabilit

Fair Value (Assets and Liabilities Measured at Fair Value by Level on Recurring Basis) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	¥ 11,997,000	¥ 14,958,000
Investment securities, Available-for-sale debt securities		47,117,813	34,200,203
Equity securities		6,222,920	5,385,258
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	11,714,000	14,034,000
Obligation to return securities received as collateral		6,581,759	4,806,171
Interest Rate Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	7,718,000	10,847,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	7,361,000	10,205,000
Foreign Exchange Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	3,910,000	3,734,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	4,027,000	3,608,000
Equity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	231,000	236,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	237,000	277,000
Commodity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	27,000	26,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	27,000	26,000
Credit Derivatives [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	94,000	114,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	109,000	95,000
Other [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3],[4]	17,000	1,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3],[4]	(47,000)	(177,000)
Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		35,273,211	23,462,879
Japanese Prefectural and Municipal Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		3,731,513	2,952,820
Foreign Government and Official Institution Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		2,926,963	3,037,488
Corporate Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,134,270	1,272,826
Residential Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,467,130	1,459,393
Commercial Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		464,565	382,255
Asset-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,384,485	1,469,476
Other Debt Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		171,578	163,066	[5]
Commercial Paper [Member]
Assets:
Investment securities, Available-for-sale debt securities		564,098
Fair Value, Measurements, Recurring [Member]
Assets:
Trading account assets, Trading securities	[6]	32,360,686	32,479,566
Trading account assets, Trading derivative assets		11,981,438	14,957,574
Investment securities, Available-for-sale debt securities		47,117,813	34,200,203
Equity securities		5,805,061	4,808,281
Other	[7]	1,263,701	1,136,800
Assets at fair value, Total		98,528,699	87,582,424
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		261,138	559,382
Trading account liabilities, Trading derivative liabilities		11,756,415	14,208,051
Obligation to return securities received as collateral	[8]	6,581,759	4,806,171
Other	[9]	556,341	520,609
Liabilities at fair value, Total		19,155,653	20,094,213
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities	[6]	18,439,146	14,891,635
Trading account assets, Trading derivative assets		136,515	216,834
Investment securities, Available-for-sale debt securities		34,010,613	22,126,881
Equity securities		5,530,077	4,471,499
Other	[7]	1,202,230	1,054,186
Assets at fair value, Total		59,318,581	42,761,035
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		260,149	555,664
Trading account liabilities, Trading derivative liabilities		150,750	300,215
Obligation to return securities received as collateral	[8]	6,484,452	4,663,068
Liabilities at fair value, Total		6,895,351	5,518,947
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities	[6]	13,165,127	17,061,985
Trading account assets, Trading derivative assets		11,774,865	14,680,632
Investment securities, Available-for-sale debt securities		12,817,584	11,798,392
Equity securities		229,415	296,819
Other	[7]	42,687	45,913
Assets at fair value, Total		38,029,678	43,883,741
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		989	3,718
Trading account liabilities, Trading derivative liabilities		11,560,634	13,851,205
Obligation to return securities received as collateral	[8]	97,307	143,103
Other	[9]	558,553	514,003
Liabilities at fair value, Total		12,217,483	14,512,029
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities	[6]	756,413	525,946
Trading account assets, Trading derivative assets		70,058	60,108
Investment securities, Available-for-sale debt securities		289,616	274,930
Equity securities		45,569	39,963
Other	[7]	18,784	36,701
Assets at fair value, Total		1,180,440	937,648
Liabilities:
Trading account liabilities, Trading derivative liabilities		45,031	56,631
Other	[9]	(2,212)	6,606
Liabilities at fair value, Total		42,819	63,237
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		7,717,955	10,846,607
Liabilities:
Trading account liabilities, Trading derivative liabilities		7,361,129	10,205,375
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		23,906	74,488
Liabilities:
Trading account liabilities, Trading derivative liabilities		10,696	153,098
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		7,673,031	10,758,790
Liabilities:
Trading account liabilities, Trading derivative liabilities		7,343,594	10,038,198
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		21,018	13,329
Liabilities:
Trading account liabilities, Trading derivative liabilities		6,839	14,079
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		3,910,162	3,733,683
Liabilities:
Trading account liabilities, Trading derivative liabilities		4,022,141	3,603,990
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		929	1,550
Liabilities:
Trading account liabilities, Trading derivative liabilities		977	3,360
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		3,896,713	3,723,087
Liabilities:
Trading account liabilities, Trading derivative liabilities		4,015,927	3,596,589
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		12,520	9,046
Liabilities:
Trading account liabilities, Trading derivative liabilities		5,237	4,041
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		231,575	235,572
Liabilities:
Trading account liabilities, Trading derivative liabilities		237,418	276,699
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		111,680	140,796
Liabilities:
Trading account liabilities, Trading derivative liabilities		139,077	143,757
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		113,586	87,285
Liabilities:
Trading account liabilities, Trading derivative liabilities		92,655	121,229
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		6,309	7,491
Liabilities:
Trading account liabilities, Trading derivative liabilities		5,686	11,713
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		26,897	27,502
Liabilities:
Trading account liabilities, Trading derivative liabilities		26,960	26,789
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		1	10
Liabilities:
Trading account liabilities, Trading derivative liabilities		1	14
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		26,896	27,492
Liabilities:
Trading account liabilities, Trading derivative liabilities		26,959	26,775
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member]
Assets:
Trading account assets, Trading derivative assets		93,888	114,210
Liabilities:
Trading account liabilities, Trading derivative liabilities		108,540	95,198
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		91,534	111,460
Liabilities:
Trading account liabilities, Trading derivative liabilities		108,457	95,175
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		2,354	2,750
Liabilities:
Trading account liabilities, Trading derivative liabilities		83	23
Fair Value, Measurements, Recurring [Member] | Other [Member]
Assets:
Trading account assets, Trading derivative assets	[10]	961
Liabilities:
Trading account liabilities, Trading derivative liabilities	[10]	227
Fair Value, Measurements, Recurring [Member] | Other [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets	[10]	961
Liabilities:
Trading account liabilities, Trading derivative liabilities	[10]	227
Fair Value, Measurements, Recurring [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		35,273,211	23,462,879
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		32,073,409	19,897,187
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		3,199,802	3,565,692
Fair Value, Measurements, Recurring [Member] | Japanese Prefectural and Municipal Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		3,731,513	2,952,820
Fair Value, Measurements, Recurring [Member] | Japanese Prefectural and Municipal Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		3,731,513	2,952,820
Fair Value, Measurements, Recurring [Member] | Foreign Government and Official Institution Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		2,926,963	3,037,488
Fair Value, Measurements, Recurring [Member] | Foreign Government and Official Institution Bonds [Member] | Level 1 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,937,204	2,229,694
Fair Value, Measurements, Recurring [Member] | Foreign Government and Official Institution Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		973,041	792,027
Fair Value, Measurements, Recurring [Member] | Foreign Government and Official Institution Bonds [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		16,718	15,767
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,134,270	1,272,826
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,134,108	1,262,718
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		162	10,108
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,467,130	1,459,393
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,467,115	1,459,378
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		464,565	382,255
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		462,966	380,278
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,599	1,977
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,384,485	1,469,476
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		1,247,565	1,328,601
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		136,920	140,875
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member]
Assets:
Investment securities, Available-for-sale debt securities		171,578	163,066
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		37,376	56,878
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale debt securities		134,202	106,188
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Assets:
Investment securities, Available-for-sale debt securities		564,098
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale debt securities		564,098
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member]
Assets:
Equity securities		5,759,492	4,768,318
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] | Level 1 [Member]
Assets:
Equity securities		5,530,077	4,471,499
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] | Level 2 [Member]
Assets:
Equity securities		229,415	296,819
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member]
Assets:
Equity securities	[11]	45,569	39,963
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member] | Private Equity Funds [Member]
Assets:
Unfunded commitments			0
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member] | Real Estate Funds [Member]
Assets:
Investments valued at net asset value		27,395	23,233
Unfunded commitments		1,006	1,494
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member] | Private Equity and Other Funds [Member]
Assets:
Investments valued at net asset value		34,390	18,862
Unfunded commitments		4,758
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities [Member] | Level 3 [Member]
Assets:
Equity securities	[11]	45,569	39,963
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Trading account assets, Trading securities		7,201,833	4,155,167
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		6,800,379	3,805,039
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		401,454	350,128
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Assets:
Trading account assets, Trading securities		193,936	93,479
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		193,936	93,479
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Government and Official Institution Bonds [Member]
Assets:
Trading account assets, Trading securities		9,959,753	9,775,245
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Government and Official Institution Bonds [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities		9,508,030	9,356,427
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Government and Official Institution Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		450,443	417,766
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Government and Official Institution Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		1,280	1,052
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Assets:
Trading account assets, Trading securities		2,711,811	2,537,714
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities		5,123	11
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		2,706,611	2,537,559
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		77	144
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Assets:
Trading account assets, Trading securities		6,167,340	9,037,539
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities		27
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		6,166,313	9,037,539
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		1,000
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member]
Assets:
Trading account assets, Trading securities		1,382,517	1,006,815
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		1,045,706	590,556
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		336,811	416,259
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member]
Assets:
Trading account assets, Trading securities		277,635	14,438
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities			7,787
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		277,635	6,651
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Paper [Member]
Assets:
Trading account assets, Trading securities		1,001,233	2,959,580
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Paper [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		1,001,233	2,959,580
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Trading account assets, Trading securities	[12]	3,464,628	2,899,589
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Private Equity Funds [Member]
Assets:
Investments valued at net asset value		102,255	66,918
Unfunded commitments		97,413	102,743
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities	[12]	2,125,587	1,730,158
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities	[12]	1,199,431	1,067,591
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities	[12]	¥ 139,610	¥ 101,840
[1]	For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 31.
[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 mainly includes bifurcated embedded derivatives carried at fair value, which are presented in Loans, Deposits and Long-term debt.
[5]	Other debt securities in the table above mainly include ¥86,734 million of private placement debt conduit bonds.
[6]	Includes securities measured under the fair value option.
[7]	Mainly comprises securities received as collateral that may be sold or repledged under securities lending transactions and money in trust for segregating cash deposited by customers on security transactions.
[8]	Included in Other liabilities.
[9]	Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments.
[10]	For the period ended March 31, 2021, certain derivatives such as earthquake derivatives previously included in Commodity contracts are separately disclosed in Other of Trading derivative assets and liabilities.
[11]	Excludes certain investments valued at net asset value of real estate funds and private equity and other funds whose fair values at March 31, 2020 were ¥23,233 million and ¥18,862 million, respectively, and those at March 31, 2021 were ¥ 27,395 million and ¥34,390 million, respectively. The amounts of unfunded commitments related to these real estate funds and private equity and other funds at March 31, 2020 were ¥1,494 million and nil, respectively, and those at March 31, 2021 were ¥1,006 million and ¥4,758 million, respectively.
[12]	Excludes certain investments valued at net asset value of private equity funds whose fair values were ¥66,918 million and ¥102,255 million at March 31, 2020 and 2021, respectively. The amounts of unfunded commitments related to these private equity funds were ¥102,743 million and ¥97,413 million at March 31, 2020 and 2021, respectively.

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		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		¥ 881,017	¥ 1,165,128
Total gains (losses) for the period included in earnings, Assets		51,944	(27,838)
Total gains (losses) for the period included in other comprehensive income, Assets		(16,012)	607
Purchases, Assets		675,013	566,453
Issues, Assets		(653)	(1,449)
Sales, Assets		(191,734)	(246,068)
Settlements, Assets		(414,592)	(559,688)
Transfers into Level 3, Assets		188,587	108,198
Transfers out of Level 3, Assets		(38,161)	(124,326)
Level 3 assets, Ending balance		1,135,409	881,017
Change in unrealized gains (losses) included in earnings for assets still held at period end		29,112	(45,864)
Level 3 liabilities, Beginning balance		6,606	65,648
Total gains (losses) for the period included in earnings, Liabilities		(32,946)	(5,388)
Total gains (losses) for the period included in other comprehensive income, Liabilities		937	(414)
Purchases, Liabilities
Issues, Liabilities		5,336	2,258
Sales, Liabilities
Settlements, Liabilities		(27,823)	(21,133)
Transfers into Level 3, Liabilities		(7,686)	333
Transfers out of Level 3, Liabilities		(10,654)	(46,302)
Level 3 liabilities, Ending balance		(2,212)	6,606
Change in unrealized gains (losses) included in earnings for liabilities still held at period end		(17,043)	9,648
Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 liabilities, Beginning balance		6,606	65,648
Total gains (losses) for the period included in earnings, Liabilities	[1]	(32,946)	(5,388)
Total gains (losses) for the period included in other comprehensive income, Liabilities		937	(414)
Issues, Liabilities		5,336	2,258
Settlements, Liabilities		(27,823)	(21,133)
Transfers into Level 3, Liabilities	[2]	(7,686)	333
Transfers out of Level 3, Liabilities	[2]	(10,654)	(46,302)
Level 3 liabilities, Ending balance		(2,212)	6,606
Change in unrealized gains (losses) included in earnings for liabilities still held at period end	[1]	(17,043)	9,648
Trading Account Assets, Trading Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance	[3]	525,946	785,326
Total gains (losses) for the period included in earnings, Assets	[3],[4]	21,730	(22,419)
Purchases, Assets	[3]	352,917	227,656
Sales, Assets	[3]	(189,980)	(214,183)
Settlements, Assets	[3]	(117,399)	(225,980)
Transfers into Level 3, Assets	[3]	190,391	52,140
Transfers out of Level 3, Assets	[3]	(27,192)	(76,594)
Level 3 assets, Ending balance	[3]	756,413	525,946
Change in unrealized gains (losses) included in earnings for assets still held at period end	[3],[4]	23,477	(18,915)
Trading Account Assets, Trading Securities, Debt Securities [Member] | Foreign Government and Official Institution Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		1,052	792
Total gains (losses) for the period included in earnings, Assets		625	589
Purchases, Assets		49,637	93,957
Sales, Assets		(49,927)	(92,748)
Settlements, Assets		(59)	(18)
Transfers out of Level 3, Assets		(48)	(1,520)
Level 3 assets, Ending balance		1,280	1,052
Change in unrealized gains (losses) included in earnings for assets still held at period end		159	(12)
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		144	31,384
Total gains (losses) for the period included in earnings, Assets		31	(279)
Purchases, Assets		82	631
Sales, Assets		(180)	(3,937)
Settlements, Assets			(4,721)
Transfers into Level 3, Assets	[5]		24,882
Transfers out of Level 3, Assets	[5]		(47,816)
Level 3 assets, Ending balance		77	144
Change in unrealized gains (losses) included in earnings for assets still held at period end		(5)	(13)
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			35,181
Total gains (losses) for the period included in earnings, Assets			(695)
Purchases, Assets		51,533
Sales, Assets		(50,533)	(23,837)
Settlements, Assets			(10,649)
Level 3 assets, Ending balance		1,000
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		416,259	627,678
Total gains (losses) for the period included in earnings, Assets		12,808	(23,494)
Purchases, Assets		106,308	113,239
Sales, Assets		(83,700)	(93,655)
Settlements, Assets		(114,864)	(207,509)
Level 3 assets, Ending balance		336,811	416,259
Change in unrealized gains (losses) included in earnings for assets still held at period end		16,309	(18,815)
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		6,651	35,148
Total gains (losses) for the period included in earnings, Assets		11,096	(1,239)
Purchases, Assets		69,499
Transfers into Level 3, Assets	[6]	190,389
Transfers out of Level 3, Assets	[6]		(27,258)
Level 3 assets, Ending balance		277,635	6,651
Change in unrealized gains (losses) included in earnings for assets still held at period end		11,096	(387)
Trading Account Assets, Trading Securities, Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		101,840	55,143
Total gains (losses) for the period included in earnings, Assets		(2,830)	2,699
Purchases, Assets		75,858	19,829
Sales, Assets		(5,640)	(6)
Settlements, Assets		(2,476)	(3,083)
Transfers into Level 3, Assets		2	27,258	[6]
Transfers out of Level 3, Assets	[6]	(27,144)
Level 3 assets, Ending balance		139,610	101,840
Change in unrealized gains (losses) included in earnings for assets still held at period end		(4,082)	312
Trading Account Assets, Trading Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		3,477	36,170
Total gains (losses) for the period included in earnings, Assets	[4]	45,361	4,503
Total gains (losses) for the period included in other comprehensive income, Assets		(104)	178
Purchases, Assets		597	714
Issues, Assets		(653)	(1,449)
Settlements, Assets		(20,689)	(33,463)
Transfers into Level 3, Assets		(2,159)	40,857
Transfers out of Level 3, Assets		(803)	(44,033)
Level 3 assets, Ending balance		25,027	3,477
Change in unrealized gains (losses) included in earnings for assets still held at period end	[4]	31,184	(16,742)
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		(750)	(4,189)
Total gains (losses) for the period included in earnings, Assets		14,401	21,290
Total gains (losses) for the period included in other comprehensive income, Assets		(32)	(24)
Settlements, Assets		1,405	(12,025)
Transfers into Level 3, Assets		(99)	2,254
Transfers out of Level 3, Assets		(746)	(8,056)
Level 3 assets, Ending balance		14,179	(750)
Change in unrealized gains (losses) included in earnings for assets still held at period end		11,807	8,046
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		5,005	18,191
Total gains (losses) for the period included in earnings, Assets		3,743	(21,429)
Total gains (losses) for the period included in other comprehensive income, Assets		(128)	89
Purchases, Assets			3
Settlements, Assets		140	4,858
Transfers into Level 3, Assets		(1,480)	35,444	[5]
Transfers out of Level 3, Assets		3	(32,151)	[5]
Level 3 assets, Ending balance		7,283	5,005
Change in unrealized gains (losses) included in earnings for assets still held at period end		3,812	(21,483)
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		(4,222)	2,862
Total gains (losses) for the period included in earnings, Assets		27,299	5,188
Total gains (losses) for the period included in other comprehensive income, Assets		55	110
Purchases, Assets		3	96
Issues, Assets			(777)
Settlements, Assets		(21,944)	(11,305)
Transfers into Level 3, Assets		(580)	(41)
Transfers out of Level 3, Assets		12	(355)
Level 3 assets, Ending balance		623	(4,222)
Change in unrealized gains (losses) included in earnings for assets still held at period end		15,660	(2,846)
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		717	949
Level 3 assets, Beginning balance		(65)
Total gains (losses) for the period included in earnings, Assets		1	(174)
Total gains (losses) for the period included in other comprehensive income, Assets		1	(1)
Purchases, Assets			615
Issues, Assets			(672)
Level 3 assets, Ending balance		(63)	717
Change in unrealized gains (losses) included in earnings for assets still held at period end		1	(167)
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		2,727	18,357
Total gains (losses) for the period included in earnings, Assets		(166)	(372)
Total gains (losses) for the period included in other comprehensive income, Assets			4
Settlements, Assets		(290)	(14,991)
Transfers into Level 3, Assets			3,200
Transfers out of Level 3, Assets			(3,471)
Level 3 assets, Ending balance		2,271	2,727
Change in unrealized gains (losses) included in earnings for assets still held at period end		(182)	(292)
Trading Account Assets, Trading Derivatives [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance	[7]	782
Total gains (losses) for the period included in earnings, Assets	[7]	83
Purchases, Assets	[7]	594
Issues, Assets	[7]	(653)
Transfers out of Level 3, Assets	[7]	(72)
Level 3 assets, Ending balance	[7]	734	782
Change in unrealized gains (losses) included in earnings for assets still held at period end	[7]	86
Investment Securities, Available-for-sale Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		274,930	283,434
Total gains (losses) for the period included in earnings, Assets	[8]	6,710	(2,402)
Total gains (losses) for the period included in other comprehensive income, Assets		(14,559)	804
Purchases, Assets		308,672	281,041
Sales, Assets		(11)	(24)
Settlements, Assets		(276,234)	(300,023)
Transfers into Level 3, Assets		70	15,201
Transfers out of Level 3, Assets		(9,962)	(3,101)
Level 3 assets, Ending balance		289,616	274,930
Change in unrealized gains (losses) included in earnings for assets still held at period end	[8]	(2,779)	(934)
Investment Securities, Available-for-sale Debt Securities [Member] | Foreign Government and Official Institution Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		15,767	19,246
Total gains (losses) for the period included in other comprehensive income, Assets		(888)	1,625
Purchases, Assets		3,518	828
Settlements, Assets		(1,679)	(5,932)
Level 3 assets, Ending balance		16,718	15,767
Change in unrealized gains (losses) included in earnings for assets still held at period end		473
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		10,108	4,196
Total gains (losses) for the period included in earnings, Assets		(8)	(458)
Total gains (losses) for the period included in other comprehensive income, Assets		(1)	342
Purchases, Assets			663
Sales, Assets			(1)
Settlements, Assets		(45)	(6,734)
Transfers into Level 3, Assets		70	15,201	[5]
Transfers out of Level 3, Assets	[5]	(9,962)	(3,101)
Level 3 assets, Ending balance		162	10,108
Change in unrealized gains (losses) included in earnings for assets still held at period end		(10)	(934)
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		1,977	2,038
Total gains (losses) for the period included in other comprehensive income, Assets		(346)	125
Sales, Assets		(11)	(23)
Settlements, Assets		(21)	(163)
Level 3 assets, Ending balance		1,599	1,977
Change in unrealized gains (losses) included in earnings for assets still held at period end		(163)
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		140,875	131,455
Total gains (losses) for the period included in earnings, Assets		6,718	(1,944)
Total gains (losses) for the period included in other comprehensive income, Assets		(7,958)	(1,085)
Purchases, Assets		267,767	274,110
Settlements, Assets		(270,482)	(261,661)
Level 3 assets, Ending balance		136,920	140,875
Change in unrealized gains (losses) included in earnings for assets still held at period end		(4,047)
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		106,188	126,484
Total gains (losses) for the period included in other comprehensive income, Assets		(5,366)	(203)
Purchases, Assets		37,387	5,440
Settlements, Assets		(4,007)	(25,533)
Level 3 assets, Ending balance		134,202	106,188
Change in unrealized gains (losses) included in earnings for assets still held at period end		968
Investment Securities, Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		39,963	27,820
Total gains (losses) for the period included in earnings, Assets	[8]	(3,231)	2,585
Purchases, Assets		10,481	12,718
Sales, Assets		(1,725)	(2,527)
Settlements, Assets			(35)
Transfers into Level 3, Assets		285
Transfers out of Level 3, Assets		(204)	(598)
Level 3 assets, Ending balance		45,569	39,963
Change in unrealized gains (losses) included in earnings for assets still held at period end	[8]	(4,150)	863
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		39,963	27,820
Total gains (losses) for the period included in earnings, Assets		(3,231)	2,585
Purchases, Assets		10,481	12,718
Sales, Assets		(1,725)	(2,527)
Settlements, Assets			(35)
Transfers into Level 3, Assets		285
Transfers out of Level 3, Assets		(204)	(598)
Level 3 assets, Ending balance		45,569	39,963
Change in unrealized gains (losses) included in earnings for assets still held at period end		(4,150)	863
Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		36,701	32,378
Total gains (losses) for the period included in earnings, Assets	[9]	(18,626)	(10,105)
Total gains (losses) for the period included in other comprehensive income, Assets		(1,349)	(375)
Purchases, Assets		2,346	44,324
Sales, Assets		(18)	(29,334)
Settlements, Assets		(270)	(187)
Level 3 assets, Ending balance		18,784	36,701
Change in unrealized gains (losses) included in earnings for assets still held at period end	[9]	¥ (18,620)	¥ (10,136)
[1]	Included in Trading account profits (losses)—net.
[2]	Transfers into (out of) Level 3 for long-term debt in Other were mainly caused by the decrease (increase) in the observability of the key inputs to the valuation models and a corresponding increase (decrease) in the significance of the unobservable inputs.
[3]	Includes Trading securities measured under the fair value option.
[4]	Included in Trading account profits (losses)—net and Foreign exchange gains (losses)—net.
[5]	Transfers into (out of) Level 3 for Foreign exchange contracts—net were mainly caused by the valuation using certain unobservable input. For the fiscal year ended March 31, 2020, 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 vendors. For the fiscal year ended March 31, 2021, transfers out of Level 3 for Corporate bonds were due to changes in the impact of unobservable credit worthiness inputs to the entire fair value measurement of the private placement bonds issued by Japanese non-public companies. Unobservable credit worthiness inputs include probability of default based on credit ratings of the bond issuers and loss given default.
[6]	Transfers relate to the reclassification of certain securities.
[7]	For the fiscal year ended March 31, 2021, certain derivatives such as earthquake derivatives previously included in Commodity contracts—net are separately disclosed in Other—net of Trading derivatives—net.
[8]	Included in Investment securities gains (losses)—net and Other comprehensive income—net.
[9]	Included in Fees and commissions income and 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		Mar. 31, 2021JPY (¥)yr	Mar. 31, 2020JPY (¥)yr
Interest Rate Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Fair value	[1]	¥ 12,841	¥ (728)
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		0.300	0.329
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		0.619	0.625
Interest Rate Contracts [Member] | Option Model [Member] | Correlation Between Interest Rates [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.448
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		0.151	0.167
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		0.600	0.600
Interest Rate Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Foreign Exchange Rate [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.416
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	0
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		1	1
Interest Rate Contracts [Member] | Option Model [Member] | Volatility [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.650
Foreign Exchange Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Fair value	[1]	¥ 7,283	¥ 5,005
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		0.100	0.300
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		0.700	0.700
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Interest Rates [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.510
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	0.158
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		0.600	0.600
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Interest Rate and Foreign Exchange Rate [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.389
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rates [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs			0.600
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rates [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs		0.500
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rates [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs		0.706
Foreign Exchange Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rates [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.664
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		0.095	0.075
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		0.221	0.170
Foreign Exchange Contracts [Member] | Option Model [Member] | Volatility [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.137
Equity Contracts [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Fair value	[1]	¥ 5,557	¥ 6,166
Equity Contracts [Member] | Discounted Cash Flow [Member] | Term of Litigation [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs | yr		0	0.1
Equity Contracts [Member] | Discounted Cash Flow [Member] | Term of Litigation [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs | yr		1.2	1.1
Equity Contracts [Member] | Discounted Cash Flow [Member] | Term of Litigation [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs | yr	[2]	0.6
Equity Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Fair value	[1]	¥ (4,597)	¥ (10,038)
Equity 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		0.275	0.242
Equity 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		0.400	0.320
Equity Contracts [Member] | Option Model [Member] | Volatility [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.318
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		(0.584)	(0.584)
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		0.550	0.569
Equity Contracts [Member] | Option Model [Member] | Correlation Between Foreign Exchange Rate and Equity [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.262
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		0.150	0.195
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		0.950	0.810
Equity Contracts [Member] | Option Model [Member] | Correlation Between Equities [Member] | Median [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives—net, Significant unobservable inputs	[2]	0.540
Foreign Government and Official Institution 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]	¥ 16,718	¥ 15,767
Foreign Government and Official Institution 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		0.002	0.002
Foreign Government and Official Institution 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		0.018	0.013
Foreign Government and Official Institution 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]	0.005	0.004
Foreign Government and Official Institution 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		0.350	0.550
Foreign Government and Official Institution 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		0.900	0.900
Foreign Government and Official Institution 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]	0.669	0.699
Foreign Government and Official Institution 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	0.080
Foreign Government and Official Institution 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	0.100
Foreign Government and Official Institution 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	0.099
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]	¥ 89,607	¥ 92,025
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		0.043	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		0.049	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]	0.047	0.050
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		0.780	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		0.966	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]	0.906	0.682
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]	¥ 279,547	¥ 389,170
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]	0.030	0.010
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]	0.030	0.010
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Discount Factor [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.013	0.011
Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Discount Factor [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs	[3]	0.016	0.014
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]	0.013	0.014
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]	0.183	0.210
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]	0.183	0.210
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]	0.837	0.990
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]	0	0
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]	0.574	0.578
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]	0.574	0.578
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]	¥ 313,895	¥ 6,651
Other Debt Securities [Member] | Discounted Cash Flow [Member] | Liquidity Premium [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs			0.024
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
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		0.032
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]	0.029	0.024
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]	¥ 79,541	¥ 86,734
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		0.080	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]	0.004	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		0.600	0.600
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]	0.788	0.798
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]	0.100	0.094
Equity Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Fair value	[1]		¥ 27,144
Equity Securities [Member] | Discounted Cash Flow [Member] | Liquidity Premium [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities, Significant unobservable inputs			0.010
Equity 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]		0.010
[1]	The fair value as of March 31, 2020 and 2021 excludes the fair value of investments valued using vendor prices.
[2]	Weighted average is calculated by weighing each input by the relative fair value of the respective financial instruments for investment securities. Median is used for derivative instruments.
[3]	For further detail of Internal model, refer to the last paragraph of “Trading Account Assets and Liabilities—Trading Account Securities”.
[4]	See “Probability of default” in “Changes in and range of unobservable inputs”.

Fair Value (Carrying Value of A

Fair Value (Carrying Value of Assets Measured at Fair Value on Nonrecurring Basis by Level) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Goodwill		¥ 370,852	¥ 517,626	¥ 433,891
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1],[2]	40,778	18,176
Loans		263,468	272,029
Loans, Loans held for sale		52,159	73,573
Loans, Collateral dependent loans		211,309	198,456
Premises and equipment		15,243	37,109
Intangible assets		2,421	453
Goodwill		132,976	283,032
Other assets		169,978	91,624
Other assets, Investments in equity method investees	[1]	153,850	78,926
Other assets, Other		16,128	12,698
Assets at fair value, Total		624,864	702,423
Fair Value, Measurements, Nonrecurring [Member] | Private Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities valued at net asset value		24,319	12,935
Unfunded commitments related to investment securities valued at net asset value		19,101	17,216
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans		2,667	2,548
Loans, Collateral dependent loans		2,667	2,548
Other assets		111,626	73,015
Other assets, Investments in equity method investees	[1]	111,626	73,015
Assets at fair value, Total		114,293	75,563
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1],[2]	32,421	15,473
Loans		5,125	9,199
Loans, Collateral dependent loans		5,125	9,199
Other assets		33,840
Other assets, Investments in equity method investees	[1]	33,840
Assets at fair value, Total		71,386	24,672
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1],[2]	8,357	2,703
Loans		255,676	260,282
Loans, Loans held for sale		52,159	73,573
Loans, Collateral dependent loans		203,517	186,709
Premises and equipment		15,243	37,109
Intangible assets		2,421	453
Goodwill		132,976	283,032
Other assets		24,512	18,609
Other assets, Investments in equity method investees	[1]	8,384	5,911
Other assets, Other		16,128	12,698
Assets at fair value, Total		¥ 439,185	¥ 602,188
[1]	Excludes certain investments valued at net asset value of ¥12,935 million and ¥24,319 million at March 31, 2020 and 2021, respectively. The unfunded commitments related to these investments are ¥17,216 million and ¥19,101 million at March 31, 2020 and 2021, respectively. These investments are in private equity funds.
[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 (Gains) Reco

Fair Value (Losses (Gains) Recorded as a Result of Changes in Fair Value Measured on a Nonrecurring Basis) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	¥ 390,013	¥ 495,484
Investment Securities [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	(16,522)	(2,171)
Loans [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	116,849	47,359
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	959	4,688
Loans [Member] | Collateral Dependent Loans [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	115,890	42,671
Premises and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	11,548	16,517
Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	19,200	3,732
Goodwill [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	147,564	383,810
Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	111,374	46,237
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	53,758	21,672
Other Assets [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses (gains) on change in fair value	¥ 57,616	¥ 24,565

Fair Value (Gains (Losses) Rela

Fair Value (Gains (Losses) Related to Instruments for which Fair Value Option was Elected) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Financial Liabilities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		¥ (4,961)	¥ (2,893)	¥ (13,881)
Financial Liabilities [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		(4,961)	(2,893)	(13,881)
Financial Liabilities [Member] | Other Short-term Borrowings [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	(6,484)	5,194	(5,559)
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]	(6,484)	5,194	(5,559)
Financial Liabilities [Member] | Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	1,523	(8,087)	(8,322)
Financial Liabilities [Member] | Long-term Debt [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	1,523	(8,087)	(8,322)
Financial Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		353,267	241,815	395,530
Financial Assets [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		(370,238)	837,832	208,952
Financial Assets [Member] | Foreign Exchange Gains (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		723,505	(596,017)	186,578
Financial Assets [Member] | Trading Account Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[2]	353,267	241,815	395,530
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]	(370,238)	837,832	208,952
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]	¥ 723,505	¥ (596,017)	¥ 186,578
[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	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Remaining aggregate contractual amounts outstanding, Financial liabilities	¥ 420,227	¥ 319,149
Fair value, Financial liabilities	402,823	304,067
Fair value over (under) remaining aggregate contractual amounts outstanding, Financial liabilities	(17,404)	(15,082)
Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Remaining aggregate contractual amounts outstanding, Financial liabilities	420,227	319,149
Fair value, Financial liabilities	402,823	304,067
Fair value over (under) remaining aggregate contractual amounts outstanding, Financial liabilities	¥ (17,404)	¥ (15,082)

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 Millions		Mar. 31, 2021	Mar. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts of investments in equity method investees		¥ 2,560,339	¥ 2,421,154
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		49,977,000	33,283,000
Interest-earning deposits in other banks		53,347,000	45,267,000
Call loans and funds sold		1,256,000	1,169,000
Receivables under resale agreements		13,780,000	23,996,000
Receivables under securities borrowing transactions		3,370,000	3,444,000
Investment securities		3,904,000	4,166,000
Loans, net of allowance for credit losses	[1]	114,350,000	117,373,000
Other financial assets	[2]	8,108,000	8,494,000
Deposits, Non-interest-bearing		38,521,000	33,382,000
Deposits, Interest-bearing		190,695,000	170,574,000
Total deposits		229,216,000	203,956,000
Call money and funds purchased		2,354,000	3,669,000
Payables under repurchase agreements		24,568,000	31,850,000
Payables under securities lending transactions		843,000	1,017,000
Due to trust account and other short-term borrowings		17,883,000	19,057,000
Long-term debt		34,773,000	27,772,000
Other financial liabilities		7,027,000	7,139,000
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		49,977,000	33,283,000
Interest-earning deposits in other banks		53,347,000	45,267,000
Call loans and funds sold		1,256,000	1,169,000
Receivables under resale agreements		13,780,000	23,996,000
Receivables under securities borrowing transactions		3,370,000	3,444,000
Investment securities		3,939,000	4,178,000
Loans, net of allowance for credit losses	[1]	115,709,000	118,497,000
Other financial assets	[2]	8,108,000	8,494,000
Deposits, Non-interest-bearing		38,521,000	33,382,000
Deposits, Interest-bearing		190,712,000	170,631,000
Total deposits		229,233,000	204,013,000
Call money and funds purchased		2,354,000	3,669,000
Payables under repurchase agreements		24,568,000	31,850,000
Payables under securities lending transactions		843,000	1,017,000
Due to trust account and other short-term borrowings		17,883,000	19,057,000
Long-term debt		35,042,000	27,941,000
Other financial liabilities		7,027,000	7,139,000
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		49,977,000	33,283,000
Investment securities		1,123,000	1,134,000
Loans, net of allowance for credit losses	[1]	3,000	3,000
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest-earning deposits in other banks		53,347,000	45,267,000
Call loans and funds sold		1,256,000	1,169,000
Receivables under resale agreements		13,780,000	23,996,000
Receivables under securities borrowing transactions		3,370,000	3,444,000
Investment securities		780,000	1,042,000
Loans, net of allowance for credit losses	[1]	298,000	259,000
Other financial assets	[2]	8,108,000	8,494,000
Deposits, Non-interest-bearing		38,521,000	33,382,000
Deposits, Interest-bearing		190,712,000	170,631,000
Total deposits		229,233,000	204,013,000
Call money and funds purchased		2,354,000	3,669,000
Payables under repurchase agreements		24,568,000	31,850,000
Payables under securities lending transactions		843,000	1,017,000
Due to trust account and other short-term borrowings		17,883,000	19,057,000
Long-term debt		35,042,000	27,941,000
Other financial liabilities		7,027,000	7,139,000
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		2,036,000	2,002,000
Loans, net of allowance for credit losses	[1]	¥ 115,408,000	¥ 118,235,000
[1]	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.
[2]	Excludes investments in equity method investees of ¥2,421 billion and ¥2,560 billion at March 31, 2020 and 2021, respectively.

Parent Company Only Financial_3

Parent Company Only Financial Information (Narrative) (Detail) - BK and TB [Member] - JPY (¥) ¥ in Billions	Mar. 31, 2021	Mar. 31, 2020
Companies Act [Member]
Parent Company Only Financial Information [Line Items]
Unrestricted amount of retained earnings that are in excess of the level required under the statutory reserve requirements	¥ 5,155	¥ 5,247
Banking Law and Related Regulations [Member]
Parent Company Only Financial Information [Line Items]
Percentage limitation of loans or credits to the parent company over the banking subsidiary's consolidated total capital	15.00%
Restricted amount of net assets of consolidated subsidiaries as to payment of cash dividends and loans to the parent company	¥ 6,007	¥ 5,696

Parent Company Only Financial_4

Parent Company Only Financial Information (Condensed Balance Sheets) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Assets:
Total assets	¥ 353,824,625	¥ 331,753,283	¥ 305,228,899
Liabilities and shareholder's equity:
Total liabilities	337,580,071	316,008,767
Total shareholders' equity	15,660,949	15,016,487
Total liabilities and equity	353,824,625	331,753,283
MUFG [Member]
Assets:
Cash and interest-earning deposits with banking subsidiaries	229,380	185,668
Investments in subsidiaries and affiliated companies	16,658,522	16,116,568
Investments in subsidiaries and affiliated companies, Banking subsidiaries	12,793,367	12,361,190
Investments in subsidiaries and affiliated companies, Non-banking subsidiaries and affiliated companies	3,865,155	3,755,378
Loans to subsidiaries	9,208,439	8,746,231
Loans to subsidiaries, Banking subsidiaries	8,690,696	8,222,278
Loans to subsidiaries, Non-banking subsidiaries	517,743	523,953
Other assets	197,231	241,441
Total assets	26,293,572	25,289,908
Liabilities and shareholder's equity:
Short-term borrowings from banking subsidiaries	1,206,694	1,255,991
Long-term debt from non-banking subsidiaries and affiliated companies	15,897	30,686
Long-term debt	9,226,046	8,758,646
Other liabilities	183,986	228,098
Total liabilities	10,632,623	10,273,421
Total shareholders' equity	15,660,949	15,016,487
Total liabilities and equity	¥ 26,293,572	¥ 25,289,908

Parent Company Only Financial_5

Parent Company Only Financial Information (Condensed Statements of Income) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income:
Foreign exchange gains (losses)—net	¥ 99,337	¥ (281,790)	¥ (95,987)
Trading account losses—net	(410,368)	765,373	168,900
Expense:
Operating expenses	2,833,700	2,879,600	2,726,800
Income before income tax expense	1,608,342	433,220	870,842
Income tax expense (benefit)	444,948	114,505	133,237
Net income attributable to Mitsubishi UFJ Financial Group	1,117,298	305,955	718,645
MUFG [Member]
Income:
Dividends from subsidiaries and affiliated companies	404,064	376,376	306,879
Dividends from subsidiaries and affiliated companies, Banking subsidiaries	317,453	277,472	207,161
Dividends from subsidiaries and affiliated companies, Non-banking subsidiaries and affiliated companies	86,611	98,904	99,718
Management fees from subsidiaries	35,095	33,543	28,305
Interest income from subsidiaries	174,816	174,500	127,117
Foreign exchange gains (losses)—net	1,089	4,834	(20,598)
Trading account losses—net	(18,285)	(37,272)	(8,078)
Gains on sales of investment in subsidiaries and affiliated companies—net	95	67,406	252,253
Other income	12,552	14,968	3,199
Total income	609,426	634,355	689,077
Expense:
Operating expenses	37,567	30,431	28,168
Interest expense to subsidiaries and affiliated companies	11,415	26,244	34,594
Interest expense	159,057	155,774	108,756
Other expense	8,164	15,024	1,657
Total expense	216,203	227,473	173,175
Equity in undistributed net income (loss) of subsidiaries and affiliated companies—net	727,257	(108,069)	194,390
Income before income tax expense	1,120,480	298,813	710,292
Income tax expense (benefit)	3,182	(7,142)	(8,353)
Net income attributable to Mitsubishi UFJ Financial Group	¥ 1,117,298	¥ 305,955	¥ 718,645

Parent Company Only Financial_6

Parent Company Only Financial Information (Condensed Statements of Cash Flows) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income attributable to Mitsubishi UFJ Financial Group	¥ 1,117,298	¥ 305,955	¥ 718,645
Net cash provided by (used in) operating activities	(245,067)	(1,355,900)	228,334
Cash flows from investing activities:
Other—net	(14,802)	(68,611)	(49,590)
Net cash provided by (used in) investing activities	3,657,359	(18,085,443)	(4,632,028)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	18,707,004	4,999,531	5,020,636
Repayment of long-term debt	(11,360,120)	(4,983,073)	(4,236,887)
Proceeds from sales of treasury stock	899	1,235	2,322
Payments for acquisition of treasury stock	(20)	(50,028)	(159,962)
Other—net	(22,566)	358,922	197,673
Net cash provided by (used in) financing activities	20,963,620	23,782,518	3,063,331
Net increase (decrease) in cash and cash equivalents	24,773,199	3,978,523	(1,296,388)
Cash and cash equivalents at beginning of fiscal year	78,555,591	74,577,068	75,873,456
Cash and cash equivalents at end of fiscal year	103,328,790	78,555,591	74,577,068
MUFG [Member]
Cash flows from operating activities:
Net income attributable to Mitsubishi UFJ Financial Group	1,117,298	305,955	718,645
Adjustments and other	(568,317)	(1,704)	(351,775)
Net cash provided by (used in) operating activities	548,981	304,251	366,870
Cash flows from investing activities:
Proceeds from redemption of other investment securities		240,000
Proceeds from sales of investment in subsidiaries and affiliated companies	35,081	135,581	455,605
Purchase of equity investment in subsidiaries and an affiliated company			(18,346)
Net increase in loans to subsidiaries	(462,208)	(1,547,178)	(2,112,711)
Other—net	(11,531)	(12,572)	(9,009)
Net cash provided by (used in) investing activities	(438,658)	(1,184,169)	(1,684,461)
Cash flows from financing activities:
Net decrease in short-term borrowings from subsidiaries	(49,058)	(164,272)	(194,300)
Proceeds from issuance of long-term debt	831,121	1,844,488	2,043,677
Repayment of long-term debt	(514,436)	(214,994)	(314)
Repayment of long-term debt to affiliated companies	(10,500)	(241,000)	(500)
Proceeds from sales of treasury stock	1	2	3
Payments for acquisition of treasury stock	(13)	(50,022)	(150,277)
Dividends paid	(321,772)	(304,538)	(276,279)
Other—net	(1,954)	(7,791)	(15,490)
Net cash provided by (used in) financing activities	(66,611)	861,873	1,406,520
Net increase (decrease) in cash and cash equivalents	43,712	(18,045)	88,929
Cash and cash equivalents at beginning of fiscal year	185,668	203,713	114,784
Cash and cash equivalents at end of fiscal year	¥ 229,380	¥ 185,668	¥ 203,713

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Detail) - Subsequent Event [Member] - Common Stock [Member] ¥ / shares in Units, ¥ in Millions	Jun. 29, 2021JPY (¥)¥ / shares
Subsequent Event [Line Items]
Dividends payable, amount per share | ¥ / shares	¥ 12.5
Dividends payable, total amount | ¥	¥ 160,918
Dividends payable, date to be paid	Jun. 30, 2021
Dividends payable, date of record	Mar. 31, 2021