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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Financing Receivables Modified as Troubled Debt Restructurings (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | ¥ 5,500 | ¥ 900
Consumer borrowers |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | 808 | 900
Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | 5 | 4
Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | 2 | 6
Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | 801 | ¥ 890
Corporate borrowers |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | 4,692 |
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment | ¥ 4,692 |

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