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v3.25.2

Short-Term and Long-Term Debt - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings | ¥ 5,733,118 | ¥ 5,626,376 |  |  |  |
Net amortization expenses of bond premiums and discounts, deferred issuance costs of bonds and medium-term notes | 1,455 | 1,247 | ¥ 1,093 |  |  |
Total committed credit lines | 795,634 | 758,667 |  |  |  |
Available credit lines | 598,079 | 559,322 |  |  |  |
Long-term committed credit lines | 502,177 | ¥ 495,474 |  |  |  |
Secured by shares of subsidiaries [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt | 89,021 |  |  |  |  |
Secured by investment in affiliates [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt | 180,248 |  |  |  |  |
Secured by loans to subsidiaries [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt | 154,926 |  |  |  |  |
Investment in securities for collateral deposits and deposits for real estate transaction [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt | 14,708 |  |  |  |  |
Subordinated Syndicated Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings | 44,000 |  |  |  |  |
Subordinated Syndicated Loan | Loan Maturing in 5 Year |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings |  |  | ¥ 34,000 | ¥ 10,000 |  |
Maturity year of loan |  |  | 2083 | 2082 |  |
Unsecured subordinated bonds premature redemption period |  |  | 5 years | 5 years |  |
Unsecured Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings | 150,000 |  |  |  |  |
Unsecured subordinated bonds face value |  |  |  |  |  | ¥ 40,000
Unsecured subordinated bonds year of maturity |  |  |  |  |  | 2080
Unsecured Subordinated Debt One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unsecured subordinated bonds face value | ¥ 60,000 |  |  |  | ¥ 50,000 |
Unsecured subordinated bonds year of maturity | 2060 |  |  |  | 2081 |
Unsecured Subordinated Debt One | Premature Redemption Period 5 Years |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unsecured subordinated bonds face value |  |  |  |  | ¥ 29,000 |
Unsecured Subordinated Debt One | Premature Redemption Period 10 Years |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unsecured subordinated bonds face value |  |  |  |  | ¥ 21,000 |

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