v3.25.2
Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated Statements of Income) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating profit: ¥ 1,565,700 ¥ 1,831,400 ¥ 1,577,400
Provision for credit losses (121,790) (258,795) (7,285)
Trading account losses—net 32,262 (703,913) (781,310)
Equity investment securities gains (losses)—net (107,892) 113,216 18,228
Foreign exchange gains (losses)—net 153,959 (296,487) 33,739
Equity in earnings of equity method investees—net 669,400 464,054 398,147
Impairment of goodwill (150,089) 0 (33,553)
Impairment of intangible assets (14,353) (15,042) (5,151)
Reversal of (provision for) off-balance sheet credit instruments 727 (33,289) (20,159)
Reversal of impairment of assets held for sale 0 0 134,141
Gain on sale of MUFG Union Bank 0 0 349,442
Income before income tax expense 1,795,576 1,878,226 461,312
Fixed assets: 1,383,200 1,395,000 1,368,100
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating profit: 1,566,000 1,831,000 1,577,000
Provision for credit losses (122,000) (259,000) (7,000)
Trading account losses—net (160,000) (1,073,000) (1,373,000)
Equity investment securities gains (losses)—net (706,000) 1,450,000 (140,000)
Debt investment securities gains—net 828,000 300,000 516,000
Foreign exchange gains (losses)—net 70,000 (426,000) (35,000)
Equity in earnings of equity method investees—net 669,000 464,000 398,000
Impairment of goodwill (150,000) 0  
Impairment of intangible assets (14,000) (15,000) (5,000)
Reversal of (provision for) off-balance sheet credit instruments 1,000 (33,000) (20,000)
Reversal of impairment of assets held for sale 0 0 134,000
Loss on valuation adjustment for loans held for sale held by MUFG Union Bank 0 0 (283,000)
Gain on sale of MUFG Union Bank 0 0 349,000
Loss on pension buyout 0 0 (84,000)
Other—net (186,000) (361,000) (532,000)
Income before income tax expense 1,796,000 1,878,000 461,000
Fixed assets: 2,881,000 2,664,000 2,333,000
U.S. GAAP adjustments and other 1,498,000 1,269,000 965,000
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Japanese GAAP      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Fixed assets: ¥ 1,383,000 ¥ 1,395,000 ¥ 1,368,000