v3.25.2
Variable Interest Entities (Assets and Liabilities of Consolidated Variable Interest Entities) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year ¥ 405,940,211 ¥ 397,820,570 ¥ 382,177,876
Cash and due from banks 4,591,186 4,416,646  
Interest-earning deposits in other banks 104,706,928 105,701,977  
Trading account assets 59,417,128 49,769,406  
Investment securities 58,318,547 62,399,298  
Total liabilities 386,690,473 379,303,483  
Deposits 249,415,006 247,136,000  
Long-term debt 21,022,407 40,012,819  
Consolidated VIEs      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 22,488,218 22,608,659  
Cash and due from banks 8,641 10,146  
Interest-earning deposits in other banks 22,136 34,166  
Trading account assets 1,379,227 1,266,293  
Investment securities 2,478,281 2,320,543  
Loans   17,514,131  
All other assets 1,890,684 1,463,380  
Total liabilities 588,974 556,291  
Deposits 0 0  
Other short-term borrowings 42,029 46,208  
Long-term debt 370,917 379,017  
All other liabilities 176,028 131,066  
Consolidated VIEs | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 22,488,218    
Cash and due from banks 8,641    
Interest-earning deposits in other banks 22,136    
Trading account assets 1,379,227    
Investment securities 2,478,281    
Loans 16,709,249    
All other assets 1,890,684    
Consolidated VIEs | Total consolidated assets before elimination      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   26,279,985  
Cash and due from banks   78,882  
Interest-earning deposits in other banks   75,424  
Trading account assets   1,338,510  
Investment securities   2,920,762  
Loans   20,373,266  
All other assets   1,493,141  
Total liabilities 23,879,692 25,638,790  
Deposits 1,715,116 3,292,449  
Other short-term borrowings 8,517,549 8,599,859  
Long-term debt 12,181,891 12,293,921  
All other liabilities 1,465,136 1,452,561  
Consolidated VIEs | Total consolidated assets before elimination | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 24,730,095    
Cash and due from banks 73,928    
Interest-earning deposits in other banks 80,130    
Trading account assets 1,459,896    
Investment securities 3,027,881    
Loans 18,025,453    
All other assets 2,062,807    
Consolidated VIEs | Total consolidated assets before elimination | Asset-backed conduits      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 7,814,826 8,186,919  
Cash and due from banks   66,761  
Interest-earning deposits in other banks   33,826  
Trading account assets   45,689  
Investment securities   860,760  
Loans   7,045,964  
All other assets   133,919  
Total liabilities 7,756,296 8,162,014  
Deposits 0 0  
Other short-term borrowings 5,928,518 6,331,278  
Long-term debt 1,453,912 1,371,157  
All other liabilities 373,866 459,579  
Consolidated VIEs | Total consolidated assets before elimination | Asset-backed conduits | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Cash and due from banks 57,908    
Interest-earning deposits in other banks 11,001    
Trading account assets 87,129    
Investment securities 1,094,698    
Loans 6,531,210    
All other assets 32,880    
Consolidated VIEs | Total consolidated assets before elimination | Investment funds      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   1,662,843  
Cash and due from banks   1,759  
Interest-earning deposits in other banks   30,748  
Trading account assets   337,619  
Investment securities   77,334  
Loans   0  
All other assets   1,215,383  
Total liabilities 1,581,746 1,147,832  
Deposits 0 0  
Other short-term borrowings 1,533,915 1,136,495  
Long-term debt 9,148 8,772  
All other liabilities 38,683 2,565  
Consolidated VIEs | Total consolidated assets before elimination | Investment funds | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 2,255,725    
Cash and due from banks 8,623    
Interest-earning deposits in other banks 48,396    
Trading account assets 420,259    
Investment securities 90,580    
Loans 0    
All other assets 1,687,867    
Consolidated VIEs | Total consolidated assets before elimination | Special purpose entities created for structured financing      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   248,049  
Cash and due from banks   0  
Interest-earning deposits in other banks   3,820  
Trading account assets   0  
Investment securities   0  
Loans   143,688  
All other assets   100,541  
Total liabilities 170,180 136,230  
Deposits 0 0  
Other short-term borrowings 0 0  
Long-term debt 131,594 117,947  
All other liabilities 38,586 18,283  
Consolidated VIEs | Total consolidated assets before elimination | Special purpose entities created for structured financing | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 313,346    
Cash and due from banks 0    
Interest-earning deposits in other banks 14,509    
Trading account assets 0    
Investment securities 0    
Loans 158,337    
All other assets 140,500    
Consolidated VIEs | Total consolidated assets before elimination | Repackaged instruments      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   296,435  
Cash and due from banks   9,892  
Interest-earning deposits in other banks   0  
Trading account assets   137,795  
Investment securities   132,951  
Loans   15,000  
All other assets   797  
Total liabilities 340,464 301,045  
Deposits 0 0  
Other short-term borrowings 0 0  
Long-term debt 222,733 287,192  
All other liabilities 117,731 13,853  
Consolidated VIEs | Total consolidated assets before elimination | Repackaged instruments | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 377,261    
Cash and due from banks 5,500    
Interest-earning deposits in other banks 0    
Trading account assets 203,970    
Investment securities 142,283    
Loans 15,000    
All other assets 10,508    
Consolidated VIEs | Total consolidated assets before elimination | Securitization of the MUFG Group’s assets      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   10,447,956  
Cash and due from banks   0  
Interest-earning deposits in other banks   1,664  
Trading account assets   0  
Investment securities   0  
Loans   10,428,225  
All other assets   18,067  
Total liabilities 10,123,630 10,460,439  
Deposits 0 0  
Other short-term borrowings 0 0  
Long-term debt 10,120,219 10,454,694  
All other liabilities 3,411 5,745  
Consolidated VIEs | Total consolidated assets before elimination | Securitization of the MUFG Group’s assets | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 10,113,082    
Cash and due from banks 0    
Interest-earning deposits in other banks 174    
Trading account assets 0    
Investment securities 0    
Loans 10,100,566    
All other assets 12,342    
Consolidated VIEs | Total consolidated assets before elimination | Trust arrangements      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   5,352,775  
Cash and due from banks   0  
Interest-earning deposits in other banks   0  
Trading account assets   803,348  
Investment securities   1,811,498  
Loans   2,737,908  
All other assets   21  
Total liabilities 3,618,686 5,352,880  
Deposits 1,715,116 3,292,449  
Other short-term borrowings 1,054,466 1,131,120  
Long-term debt 0 0  
All other liabilities 849,104 929,311  
Consolidated VIEs | Total consolidated assets before elimination | Trust arrangements | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 3,618,564    
Cash and due from banks 0    
Interest-earning deposits in other banks 0    
Trading account assets 740,514    
Investment securities 1,661,663    
Loans 1,216,343    
All other assets 44    
Consolidated VIEs | Total consolidated assets before elimination | Other      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   85,008  
Cash and due from banks   470  
Interest-earning deposits in other banks   5,366  
Trading account assets   14,059  
Investment securities   38,219  
Loans   2,481  
All other assets   24,413  
Total liabilities 288,690 78,350  
Deposits 0 0  
Other short-term borrowings 650 966  
Long-term debt 244,285 54,159  
All other liabilities 43,755 23,225  
Consolidated VIEs | Total consolidated assets before elimination | Other | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year 237,291    
Cash and due from banks 1,897    
Interest-earning deposits in other banks 6,050    
Trading account assets 8,024    
Investment securities 38,657    
Loans 3,997    
All other assets 178,666    
Consolidated VIEs | The amounts eliminated in consolidation      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year   (3,671,326)  
Cash and due from banks   (68,736)  
Interest-earning deposits in other banks   (41,258)  
Trading account assets   (72,217)  
Investment securities   (600,219)  
Loans   (2,859,135)  
All other assets   (29,761)  
Total liabilities (16,567,315) (16,806,678)  
Deposits (651) (432)  
Other short-term borrowings (4,084,517) (4,242,371)  
Long-term debt (11,771,730) (11,888,346)  
All other liabilities (710,417) (675,529)  
Consolidated VIEs | The amounts eliminated in consolidation | Pro forma, before transfer of assets and liabilities      
Variable Interest Entity [Line Items]      
Total assets at end of fiscal year (2,241,877)    
Cash and due from banks (65,287)    
Interest-earning deposits in other banks (57,994)    
Trading account assets (80,669)    
Investment securities (549,600)    
Loans (1,316,204)    
All other assets (172,123)    
Consolidated VIEs | The amount of liabilities with recourse to the general credit of the MUFG Group      
Variable Interest Entity [Line Items]      
Total liabilities (6,723,403) (8,275,821)  
Deposits (1,714,465) (3,292,017)  
Other short-term borrowings (4,391,003) (4,311,280)  
Long-term debt (39,244) (26,558)  
All other liabilities ¥ (578,691) ¥ (645,966)