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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Financing Receivables Payment Default and Modifications of Past Due (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
Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 808 | 900
Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 5 | 4
Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 2 | 6
Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | ¥ 801 | ¥ 890
Interest rate reduction | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 25 |  |
Interest rate reduction | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 3 |  |
Interest rate reduction | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 18 |  |
Interest rate reduction | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 4 |  |
Term extension | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 212 |  |
Term extension | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Term extension | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Term extension | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 212 |  |
Principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 1 |  |
Principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 1 |  |
Principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and term extension | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and term extension | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and term extension | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and term extension | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 33 |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 28 |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 5 |  |
Combination - term extension and principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 9 |  |
Combination - term extension and principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - term extension and principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - term extension and principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 9 |  |

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