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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Troubled Debt Restructurings of Financing Receivables (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | ¥ 18,487 | ¥ 14,242
Post-modification outstanding recorded investment | 16,678 | 11,471
Consumer borrowers |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 7,977 | 8,761
Post-modification outstanding recorded investment | 6,171 | 6,152
Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 10 | 15
Post-modification outstanding recorded investment | 4 | 6
Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 1,536 | 1,385
Post-modification outstanding recorded investment | 1,312 | 1,072
Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 6,431 | 7,361
Post-modification outstanding recorded investment | 4,855 | 5,074
Corporate borrowers |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 10,510 | 5,481
Post-modification outstanding recorded investment | 10,507 | 5,319
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 231 |
Post-modification outstanding recorded investment | 230 |
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-modification outstanding recorded investment | 10,279 | 5,481
Post-modification outstanding recorded investment | ¥ 10,277 | ¥ 5,319

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