v3.25.2
Accumulated Other Comprehensive Income (Before Tax and Net of Tax Changes in Each Component of Accumulated OCI) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Tax (expense) or benefit ¥ 20,182 ¥ (339,505) ¥ (20,795)
Total 473,474 1,462,277 598,005
Other comprehensive income attributable to Mitsubishi UFJ Financial Group 323,565 1,366,571 587,504
Net unrealized gains (losses) on investment securities:      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss) before reclassifications, Before tax (186,230) (72,820) (597,997)
Other comprehensive income (loss) before reclassifications, Tax (expense) or benefit 98,037 11,993 158,978
Other comprehensive income (loss) before reclassifications, Net of tax (88,193) (60,827) (439,019)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Before tax 166,982 150,646 337,317
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Tax (expense) or benefit (51,853) (45,320) (99,410)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Net of tax 115,129 105,326 237,907
Net change, Before tax (19,248) 77,826 (260,680)
Tax (expense) or benefit 46,184 (33,327) 59,568
Total 26,936 44,499 (201,112)
Net unrealized gains (losses) on investment securities attributable to noncontrolling interests      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total 83,726 (13,161) 6,719
Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total (56,790) 57,660 (207,831)
Net debt valuation adjustments:      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss) before reclassifications, Before tax 14,664 (65,133) 25,220
Other comprehensive income (loss) before reclassifications, Tax (expense) or benefit (4,470) 19,944 (7,722)
Other comprehensive income (loss) before reclassifications, Net of tax 10,194 (45,189) 17,498
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Before tax 1,538 776 444
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Tax (expense) or benefit (471) (237) (136)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Net of tax 1,067 539 308
Net change, Before tax 16,202 (64,357) 25,664
Tax (expense) or benefit (4,941) 19,707 (7,858)
Total 11,261 (44,650) 17,806
Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total 11,261 (44,650) 17,806
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges:      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss) before reclassifications, Before tax (5,668) 7,441 (38,811)
Other comprehensive income (loss) before reclassifications, Tax (expense) or benefit 1,153 (1,515) 10,716
Other comprehensive income (loss) before reclassifications, Net of tax (4,515) 5,926 (28,095)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Before tax 3,585 (8,197) 30,966
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Tax (expense) or benefit (717) 1,635 (8,448)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Net of tax 2,868 (6,562) 22,518
Net change, Before tax (2,083) (756) (7,845)
Tax (expense) or benefit 436 120 2,268
Total (1,647) (636) (5,577)
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to noncontrolling interests      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total (385) (148) 149
Net unrealized losses on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total (1,262) (488) (5,726)
Defined benefit plans:      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss) before reclassifications, Before tax 134,302 566,093 (128,786)
Other comprehensive income (loss) before reclassifications, Tax (expense) or benefit (42,213) (174,339) 37,616
Other comprehensive income (loss) before reclassifications, Net of tax 92,089 391,754 (91,170)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Before tax (30,034) (13,047) 98,438
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Tax (expense) or benefit 9,261 4,148 (27,315)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Net of tax (20,773) (8,899) 71,123
Net change, Before tax 104,268 553,046 (30,348)
Tax (expense) or benefit (32,952) (170,191) 10,301
Total 71,316 382,855 (20,047)
Defined benefit plans attributable to noncontrolling interests      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total (578) 1,813 549
Defined benefit plans attributable to Mitsubishi UFJ Financial Group      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total 71,894 381,042 (20,596)
Foreign currency translation adjustments:      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss) before reclassifications, Before tax 380,634 1,252,155 916,433
Other comprehensive income (loss) before reclassifications, Tax (expense) or benefit 3,255 (160,753) (92,554)
Other comprehensive income (loss) before reclassifications, Net of tax 383,889 1,091,402 823,879
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Before tax (26,481) (16,132) (24,424)
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Tax (expense) or benefit 8,200 4,939 7,480
Reclassification adjustment for losses (gains) included in net income (loss) before attribution of noncontrolling interests, Net of tax (18,281) (11,193) (16,944)
Net change, Before tax 354,153 1,236,023 892,009
Tax (expense) or benefit 11,455 (155,814) (85,074)
Total 365,608 1,080,209 806,935
Foreign currency translation adjustments attributable to noncontrolling interests      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total 67,146 107,202 3,084
Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total ¥ 298,462 ¥ 973,007 ¥ 803,851