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v3.23.2

Short-Term and Long-Term Debt - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Borrowings | ¥ 5,209,723 | ¥ 4,427,046 |  |
Net amortization expenses of bond premiums and discounts, deferred issuance costs of bonds and medium-term notes | 1,093 | 1,013 | ¥ 1,010 |
Total committed credit lines | 698,560 | 651,379 |  |
Available credit lines | 518,585 | 507,181 |  |
Long-term committed credit lines | 479,039 | ¥ 442,547 |  |
Secured by shares of subsidiaries [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt | 31,379 |  |  |
Secured by investment in affiliates [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt | 101,827 |  |  |
Secured by loans to subsidiaries [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt | 407,495 |  |  |
Investment in securities for collateral deposits and deposits for real estate transaction [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt | 9,911 |  |  |
Subordinated Syndicated Loan | Loan Maturing in 5 Year |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings | ¥ 44,000 |  |  |
Maturity year of loan | 2083 | 2082 |  |
Unsecured subordinated bonds premature redemption period | 5 years | 5 years |  |
Subordinated Syndicated Loan | Loan Maturing in 7 Year |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings |  | ¥ 34,000 |  |
Maturity year of loan |  | 2077 |  |
Unsecured subordinated bonds premature redemption period |  | 7 years |  |
Unsecured Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings | ¥ 150,000 |  |  |
Unsecured subordinated bonds face value |  |  |  | ¥ 100,000
Unsecured subordinated bonds year of maturity |  |  |  | 2080
Unsecured Subordinated Debt | Premature Redemption Period 5 Years |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured subordinated bonds face value |  |  |  | ¥ 60,000
Unsecured subordinated bonds premature redemption period |  |  |  | 5 years
Unsecured Subordinated Debt | Premature Redemption Period 10 Years |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured subordinated bonds face value |  |  |  | ¥ 40,000
Unsecured subordinated bonds premature redemption period |  |  |  | 10 years
Unsecured Subordinated Debt One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured subordinated bonds face value |  |  | ¥ 50,000 |
Unsecured subordinated bonds year of maturity |  |  | 2081 |
Unsecured Subordinated Debt One | Premature Redemption Period 5 Years |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured subordinated bonds face value |  |  | ¥ 29,000 |
Unsecured subordinated bonds premature redemption period |  |  | 5 years |
Unsecured Subordinated Debt One | Premature Redemption Period 10 Years |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured subordinated bonds face value |  |  | ¥ 21,000 |
Unsecured subordinated bonds premature redemption period |  |  | 10 years |
Subordinated Syndicated Loans Executed [Member] | Loan Maturing in 5 Year |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings | ¥ 34,000 | ¥ 10,000 |  |

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