v3.25.2
Foreign Activities (Estimated Financial Information by Geographic Areas) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Foreign Activities Disclosure [Line Items]      
Total revenue ¥ 10,836,109 ¥ 10,032,704 ¥ 6,141,241
Total expense 9,040,533 8,154,478 5,679,929
Income (loss) before income tax expense (benefit) 1,795,576 1,878,226 461,312
Net income attributable to Mitsubishi UFJ Financial Group 1,266,933 1,325,869 381,798
Total assets at end of fiscal year 405,940,211 397,820,570 382,177,876
Domestic, Japan      
Foreign Activities Disclosure [Line Items]      
Total revenue 2,905,946 3,824,225 2,617,960
Total expense 3,015,746 2,695,960 2,074,357
Income (loss) before income tax expense (benefit) (109,800) 1,128,265 543,603
Net income attributable to Mitsubishi UFJ Financial Group (343,745) 930,001 613,612
Total assets at end of fiscal year 261,732,514 257,518,304 249,515,736
Foreign, United States of America      
Foreign Activities Disclosure [Line Items]      
Total revenue 3,179,967 2,578,487 1,317,875
Total expense 2,141,975 2,210,134 1,622,004
Income (loss) before income tax expense (benefit) 1,037,992 368,353 (304,129)
Net income attributable to Mitsubishi UFJ Financial Group 903,188 456,755 (123,445)
Total assets at end of fiscal year 66,393,043 61,312,679 59,633,631
Foreign, Europe      
Foreign Activities Disclosure [Line Items]      
Total revenue 1,321,415 598,995 172,628
Total expense 1,014,249 692,351 370,428
Income (loss) before income tax expense (benefit) 307,166 (93,356) (197,800)
Net income attributable to Mitsubishi UFJ Financial Group 219,445 (239,793) (244,179)
Total assets at end of fiscal year 23,652,847 23,578,110 24,673,666
Foreign, Asia / Oceania Excluding Japan      
Foreign Activities Disclosure [Line Items]      
Total revenue 2,173,457 2,079,886 1,524,901
Total expense 2,038,743 1,849,365 1,313,871
Income (loss) before income tax expense (benefit) 134,714 230,521 211,030
Net income attributable to Mitsubishi UFJ Financial Group 115,817 (77,661) 22,590
Total assets at end of fiscal year 38,556,319 39,486,295 34,981,007
Foreign, Other areas      
Foreign Activities Disclosure [Line Items]      
Total revenue 1,255,324 951,111 507,877
Total expense 829,820 706,668 299,269
Income (loss) before income tax expense (benefit) 425,504 244,443 208,608
Net income attributable to Mitsubishi UFJ Financial Group 372,228 256,567 113,220
Total assets at end of fiscal year ¥ 15,605,488 ¥ 15,925,182 ¥ 13,373,836