v3.25.2
Basis of Financial Statements and Summary of Significant Accounting Policies - Adjustments Condensed Consolidated Statements of Equity (Details) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year ¥ 18,517,087 ¥ 16,523,597  
Net income attributable to Mitsubishi UFJ Financial Group 1,266,933 1,325,869 ¥ 381,798
Net change during the fiscal year 473,474 1,462,277 598,005
Net income attributable to noncontrolling interests (705) (51,700) (32,763)
Balance at end of fiscal year 19,249,738 18,517,087 16,523,597
As Previously Reported      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 18,477,213 16,466,167  
Net income attributable to Mitsubishi UFJ Financial Group   1,328,121 376,635
Net change during the fiscal year   1,476,303 637,108
Net income attributable to noncontrolling interests   (52,906) (30,413)
Balance at end of fiscal year   18,477,213 16,466,167
Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 39,874 57,430  
Net income attributable to Mitsubishi UFJ Financial Group   (2,252) 5,163
Net change during the fiscal year   (14,026) (39,103)
Net income attributable to noncontrolling interests   1,206 (2,350)
Balance at end of fiscal year   39,874 57,430
Capital surplus:      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 4,635,892 4,902,155 5,327,772
Other—net (5,609) (461) (1,497)
Balance at end of fiscal year 4,300,021 4,635,892 4,902,155
Capital surplus: | As Previously Reported      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 4,636,097 4,902,155  
Other—net   (256) (1,497)
Balance at end of fiscal year   4,636,097 4,902,155
Capital surplus: | Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year (205) 0  
Other—net   (205) 0
Balance at end of fiscal year   (205) 0
Unappropriated retained earnings:      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 9,086,490 8,185,880 8,183,653
Net income attributable to Mitsubishi UFJ Financial Group 1,266,933 1,325,869 381,798
Balance at end of fiscal year 9,821,359 9,086,490 8,185,880
Unappropriated retained earnings: | As Previously Reported      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 9,072,572 8,169,710 8,172,646
Net income attributable to Mitsubishi UFJ Financial Group   1,328,121 376,635
Balance at end of fiscal year   9,072,572 8,169,710
Unappropriated retained earnings: | Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 13,918 16,170 11,007
Net income attributable to Mitsubishi UFJ Financial Group   (2,252) 5,163
Balance at end of fiscal year   13,918 16,170
Unappropriated retained earnings: | Adjustments | Effect of adopting new guidance on troubled debt restructurings and vintage disclosures      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 13,663 0  
Balance at end of fiscal year 0 13,663 0
Accumulated other comprehensive income, net of taxes:      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 2,237,625 871,054 283,550
Net change during the fiscal year 323,565 1,366,571 587,504
Balance at end of fiscal year 2,561,190 2,237,625 871,054
Accumulated other comprehensive income, net of taxes: | As Previously Reported      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 2,221,263 844,192 227,033
Net change during the fiscal year   1,377,071 617,159
Balance at end of fiscal year   2,221,263 844,192
Accumulated other comprehensive income, net of taxes: | Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 16,362 26,862 56,517
Net change during the fiscal year   (10,500) (29,655)
Balance at end of fiscal year   16,362 26,862
Total Mitsubishi UFJ Financial Group shareholders’ equity      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 17,675,737 15,806,378  
Balance at end of fiscal year 18,285,486 17,675,737 15,806,378
Total Mitsubishi UFJ Financial Group shareholders’ equity | As Previously Reported      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 17,645,662 15,763,346  
Balance at end of fiscal year   17,645,662 15,763,346
Total Mitsubishi UFJ Financial Group shareholders’ equity | Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 30,075 43,032  
Balance at end of fiscal year   30,075 43,032
Noncontrolling interests:      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 841,350 717,219 712,763
Other—net 0 70 (939)
Net change during the fiscal year 149,909 95,706 10,501
Initial subscriptions of noncontrolling interests 3,583 58,079 3,508
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders 23,925 (22,004) (10,174)
Net income attributable to noncontrolling interests 705 51,700 32,763
Dividends paid to noncontrolling interests (29,138) (25,767) (18,789)
Balance at end of fiscal year 964,252 841,350 717,219
Noncontrolling interests: | As Previously Reported      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year 831,551 702,821 691,454
Net change during the fiscal year   99,232 19,949
Initial subscriptions of noncontrolling interests   58,117 3,316
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders   (22,204) (10,174)
Net income attributable to noncontrolling interests   52,906 30,413
Dividends paid to noncontrolling interests   (25,738) (18,784)
Balance at end of fiscal year   831,551 702,821
Noncontrolling interests: | Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of fiscal year ¥ 9,799 14,398 21,309
Net change during the fiscal year   (3,526) (9,448)
Initial subscriptions of noncontrolling interests   (38) 192
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders   200 0
Net income attributable to noncontrolling interests   (1,206) 2,350
Dividends paid to noncontrolling interests   (29) (5)
Balance at end of fiscal year   ¥ 9,799 ¥ 14,398