Severance Indemnities and Pension Plans (Fair Value of Each Major Category of Plan Assets for Pension Benefits and SIP Investments: Domestic Subsidiaries) (Detail) - Pension benefits and SIPs - JPY (¥)
¥ in Millions |
12 Months Ended |
Mar. 31, 2025 |
Mar. 31, 2024 |
| Domestic, Japan |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
¥ 1,546,173
|
¥ 1,537,928
|
| Approximate guaranteed rate of return of "Japanese general accounts of life insurance companies" |
0.94%
|
0.95%
|
| Domestic, Japan | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
¥ 1,207,657
|
¥ 1,211,474
|
| Domestic, Japan | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
335,949
|
323,906
|
| Domestic, Japan | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
2,567
|
2,548
|
| Domestic, Japan | Japanese government bonds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
51,627
|
57,220
|
| Domestic, Japan | Japanese government bonds | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
51,627
|
57,220
|
| Domestic, Japan | Japanese government bonds | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Japanese government bonds | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Non-Japanese government bonds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
571
|
5,880
|
| Domestic, Japan | Non-Japanese government bonds | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
571
|
5,880
|
| Domestic, Japan | Non-Japanese government bonds | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Non-Japanese government bonds | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Other debt securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
119,971
|
119,580
|
| Domestic, Japan | Other debt securities | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
3,691
|
4,404
|
| Domestic, Japan | Other debt securities | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
113,713
|
112,628
|
| Domestic, Japan | Other debt securities | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
2,567
|
2,548
|
| Domestic, Japan | Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
1,055,319
|
1,030,420
|
| Domestic, Japan | Japanese marketable equity securities | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
1,055,319
|
1,030,420
|
| Domestic, Japan | Japanese marketable equity securities | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Japanese marketable equity securities | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Non-Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
76,024
|
97,180
|
| Domestic, Japan | Non-Japanese marketable equity securities | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
75,941
|
96,727
|
| Domestic, Japan | Non-Japanese marketable equity securities | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
83
|
453
|
| Domestic, Japan | Non-Japanese marketable equity securities | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Other investment funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Other investment funds | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Other investment funds | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Other investment funds | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Japanese general account of life insurance companies |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
194,758
|
199,432
|
| Domestic, Japan | Japanese general account of life insurance companies | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Japanese general account of life insurance companies | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
194,758
|
199,432
|
| Domestic, Japan | Japanese general account of life insurance companies | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Domestic, Japan | Other investments |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
47,903
|
28,216
|
| Domestic, Japan | Other investments | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
20,508
|
16,823
|
| Domestic, Japan | Other investments | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
27,395
|
11,393
|
| Domestic, Japan | Other investments | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
117,864
|
108,274
|
| Foreign offices and subsidiaries | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
19,629
|
14,189
|
| Foreign offices and subsidiaries | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
97,902
|
93,653
|
| Foreign offices and subsidiaries | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
333
|
432
|
| Foreign offices and subsidiaries | Japanese government bonds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese government bonds | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese government bonds | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese government bonds | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Non-Japanese government bonds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
17,397
|
12,970
|
| Foreign offices and subsidiaries | Non-Japanese government bonds | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
14,948
|
10,226
|
| Foreign offices and subsidiaries | Non-Japanese government bonds | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
2,449
|
2,744
|
| Foreign offices and subsidiaries | Non-Japanese government bonds | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Other debt securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
47,657
|
44,397
|
| Foreign offices and subsidiaries | Other debt securities | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Other debt securities | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
47,657
|
44,397
|
| Foreign offices and subsidiaries | Other debt securities | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese marketable equity securities | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese marketable equity securities | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese marketable equity securities | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Non-Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Non-Japanese marketable equity securities | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Non-Japanese marketable equity securities | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Non-Japanese marketable equity securities | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Other investment funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
50,661
|
45,698
|
| Foreign offices and subsidiaries | Other investment funds | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
4,529
|
600
|
| Foreign offices and subsidiaries | Other investment funds | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
46,132
|
45,098
|
| Foreign offices and subsidiaries | Other investment funds | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese general account of life insurance companies |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese general account of life insurance companies | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese general account of life insurance companies | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Japanese general account of life insurance companies | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
0
|
0
|
| Foreign offices and subsidiaries | Other investments |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
2,149
|
5,209
|
| Foreign offices and subsidiaries | Other investments | Level 1 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
152
|
3,363
|
| Foreign offices and subsidiaries | Other investments | Level 2 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
1,664
|
1,414
|
| Foreign offices and subsidiaries | Other investments | Level 3 |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Defined benefit plan, fair value of plan assets |
¥ 333
|
¥ 432
|