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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Past Due Financial Assets Modified to Debtors (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | ¥ 5,500 | ¥ 900
Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 10,522 |  |
30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 91 |  |
90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 291 |  |
Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 808 | 900
Consumer borrowers | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 35 |  |
Consumer borrowers | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 91 |  |
Consumer borrowers | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 7 |  |
Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 5 | 4
Consumer borrowers | Real estate loans | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 1 |  |
Consumer borrowers | Real estate loans | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Consumer borrowers | Real estate loans | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 2 | 6
Consumer borrowers | Card loans | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Consumer borrowers | Card loans | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Consumer borrowers | Card loans | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | ¥ 801 | ¥ 890
Consumer borrowers | Other | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 34 |  |
Consumer borrowers | Other | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 91 |  |
Consumer borrowers | Other | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 7 |  |
Corporate borrowers | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 6,140 |  |
Corporate borrowers | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 284 |  |
Corporate borrowers | Non-recourse Loans | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 1,277 |  |
Corporate borrowers | Non-recourse Loans | Current | The Americas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 1,277 |  |
Corporate borrowers | Non-recourse Loans | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | The Americas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Non-recourse Loans | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | The Americas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Other than non-recourse loans | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 4,863 |  |
Corporate borrowers | Other than non-recourse loans | Current | Real estate companies | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 37 |  |
Corporate borrowers | Other than non-recourse loans | Current | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 481 |  |
Corporate borrowers | Other than non-recourse loans | Current | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 4,345 |  |
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Real estate companies | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 284 |  |
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Real estate companies | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 32 |  |
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 230 |  |
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 22 |  |
Loans to Equity Method Investees | Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 4,347 |  |
Loans to Equity Method Investees | 30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Loans to Equity Method Investees | 90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 0 |  |

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