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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, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  |  | ¥ 5,500
Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  |  | 808
Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  |  | 5
Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  |  | 2
Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  |  | ¥ 801
Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 0 |  |
Interest rate reduction | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 | ¥ 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 | 0 | 4 |
Interest rate reduction | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Interest rate reduction | Corporate borrowers | Commercial, industrial and other companies | Overseas [Member] |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Interest rate reduction | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Term extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Term extension | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 | 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 | 0 | 212 |
Term extension | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Term extension | Corporate borrowers | Commercial, industrial and other companies | Overseas [Member] |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Term extension | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Principal forgiveness |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 | 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 | 0 |
Principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Principal forgiveness | Corporate borrowers | Commercial, industrial and other companies | Overseas [Member] |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and term extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 7,637 |  |
Combination - interest rate reduction and term extension | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 17 | 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 | 17 | 0 |
Combination - interest rate reduction and term extension | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 7,620 |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Commercial, industrial and other companies | Overseas [Member] |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 7,620 |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 7,620 |  |
Combination - interest rate reduction and principal forgiveness |  |  |
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 | 0 | 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 | 0 | 5 |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Commercial, industrial and other companies | Overseas [Member] |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - term extension and principal forgiveness |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - term extension and principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 | 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 | 0 | ¥ 9 |
Combination - term extension and principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Commercial, industrial and other companies | Overseas [Member] |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 0 |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 0 |  |

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