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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 | Mar. 31, 2021
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | ¥ 18,487 | ¥ 14,242 | ¥ 24,002
Post-modification outstanding recorded investment | 16,678 | 11,471 | 19,776
Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 7,977 | 8,761 | 9,279
Post-modification outstanding recorded investment | 6,171 | 6,152 | 6,727
Consumer borrowers | Consumer - Real Estate Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 10 | 15 | 34
Post-modification outstanding recorded investment | 4 | 6 | 23
Consumer borrowers | Consumer-Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 1,536 | 1,385 | 1,677
Post-modification outstanding recorded investment | 1,312 | 1,072 | 1,261
Consumer borrowers | Consumer - Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 6,431 | 7,361 | 7,568
Post-modification outstanding recorded investment | 4,855 | 5,074 | 5,443
Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 10,510 | 5,481 | 14,723
Post-modification outstanding recorded investment | 10,507 | 5,319 | 13,049
Corporate borrowers | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 231 |  |
Post-modification outstanding recorded investment | 230 |  |
Corporate borrowers | Real estate companies in overseas | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment |  |  | 111
Post-modification outstanding recorded investment |  |  | 111
Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment |  |  | 38
Post-modification outstanding recorded investment |  |  | 38
Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-modification outstanding recorded investment | 10,279 | 5,481 | 14,574
Post-modification outstanding recorded investment | ¥ 10,277 | ¥ 5,319 | ¥ 12,900

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