Severance Indemnities and Pension Plans (Fair Values of Investments Valued at Net Asset per Share (or Its Equivalent) for Pension Benefits and SIP Investments) (Detail) - JPY (¥)
¥ in Millions |
Mar. 31, 2022 |
Mar. 31, 2021 |
| Domestic, Japan | Pension benefits and SIPs |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
¥ 1,549,630
|
¥ 1,512,828
|
| Domestic, Japan | Pension benefits and SIPs | Mutual funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
625,237
|
580,617
|
| Domestic, Japan | Pension benefits and SIPs | Real estate funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
15,417
|
14,763
|
| Domestic, Japan | Pension benefits and SIPs | Total pooled funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
886,893
|
902,305
|
| Domestic, Japan | Pension benefits and SIPs | Total pooled funds | Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
104,793
|
118,509
|
| Domestic, Japan | Pension benefits and SIPs | Total pooled funds | Japanese debt securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
221,250
|
324,700
|
| Domestic, Japan | Pension benefits and SIPs | Total pooled funds | Non-Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
219,018
|
90,598
|
| Domestic, Japan | Pension benefits and SIPs | Total pooled funds | Non-Japanese debt securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
249,274
|
215,015
|
| Domestic, Japan | Pension benefits and SIPs | Total pooled funds | Other |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
92,558
|
153,483
|
| Domestic, Japan | Pension benefits and SIPs | Other investment funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
662,737
|
610,523
|
| Foreign offices and subsidiaries | Pension benefits |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
140,923
|
146,726
|
| Foreign offices and subsidiaries | Pension benefits | Total pooled funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
0
|
0
|
| Foreign offices and subsidiaries | Pension benefits | Total pooled funds | Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
0
|
0
|
| Foreign offices and subsidiaries | Pension benefits | Total pooled funds | Japanese debt securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
0
|
0
|
| Foreign offices and subsidiaries | Pension benefits | Total pooled funds | Non-Japanese marketable equity securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
0
|
0
|
| Foreign offices and subsidiaries | Pension benefits | Total pooled funds | Non-Japanese debt securities |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
0
|
0
|
| Foreign offices and subsidiaries | Pension benefits | Total pooled funds | Other |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
0
|
0
|
| Foreign offices and subsidiaries | Pension benefits | Other investment funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
140,923
|
146,726
|
| Foreign offices and subsidiaries | Pension benefits | Other investment funds | Mutual funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
25,356
|
58,086
|
| Foreign offices and subsidiaries | Pension benefits | Other investment funds | Real estate funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
80,349
|
51,318
|
| Foreign offices and subsidiaries | Pension benefits | Other investment funds | Common collective funds |
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Investments valued at net asset per share (or its equivalent) |
¥ 34,971
|
¥ 37,161
|