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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Financial Effect of Modifications of Financing Receivable (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Consumer borrowers | Real estate loans | Maximum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction |  | 5.30%
Consumer borrowers | Real estate loans | Minimum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction |  | 0.00%
Consumer borrowers | Card loans | Maximum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction |  | 12.70%
Consumer borrowers | Card loans | Minimum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction |  | 0.70%
Consumer borrowers | Other | Maximum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction | 16.50% | 14.60%
Consumer borrowers | Other | Minimum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction | 11.80% | 5.30%
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas | Maximum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction | 7.90% |
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas | Minimum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction | 6.50% |
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas | Maximum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction | 15.20% | 8.80%
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas | Minimum |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction | 11.80% | 6.40%
Term extension | Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension |  | 1 year
Term extension | Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension |  | 10 months 24 days
Term extension | Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 2 years 4 months 24 days | 4 years 10 months 24 days
Term extension | Corporate borrowers | Non-recourse Loans | The Americas |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 2 months 12 days | 1 year
Term extension | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 2 years 7 months 6 days | 6 months
Term extension | Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 2 years 6 months |
Term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 10 months 24 days | 1 year
Term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 1 year 1 month 6 days | 3 years 1 month 6 days
Term extension | Loans to Equity Method Investees |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 6 months | 7 months 6 days
Principal forgiveness | Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness |  | ¥ 8
Principal forgiveness | Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness |  | 185
Principal forgiveness | Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness |  | 785
Principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness | ¥ 11 | 1,487
Principal forgiveness | Loans to Equity Method Investees |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness |  | 624
Principal forgiveness | Net investment in leases | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness |  | ¥ 0

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