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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Modifications of Financing Receivables (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis |  | ¥ 16,678 | ¥ 11,471
Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis |  | 6,171 | 6,152
Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis |  | 4 | 6
Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis |  | 1,312 | 1,072
Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis |  | ¥ 4,855 | ¥ 5,074
Interest rate reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1,266 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1,266 |  |
% of total class of financing receivable | 0.10% |  |
Interest rate reduction | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 5 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1,176 |  |
% of total class of financing receivable | 1.60% |  |
Interest rate reduction | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 85 |  |
% of total class of financing receivable | 0.20% |  |
Interest rate reduction | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Interest rate reduction | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Term extension |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 10,106 |  |
% of total class of financing receivable | 0.20% |  |
Term extension | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 4,652 |  |
% of total class of financing receivable | 0.20% |  |
Term extension | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1 |  |
% of total class of financing receivable | 0.00% |  |
Term extension | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 6 |  |
% of total class of financing receivable | 0.00% |  |
Term extension | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 4,645 |  |
% of total class of financing receivable | 9.20% |  |
Term extension | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 4,499 |  |
% of total class of financing receivable | 0.30% |  |
Term extension | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1,277 |  |
% of total class of financing receivable | 0.70% |  |
Term extension | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1,277 |  |
% of total class of financing receivable | 2.50% |  |
Term extension | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 3,222 |  |
% of total class of financing receivable | 0.30% |  |
Term extension | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 69 |  |
% of total class of financing receivable | 0.00% |  |
Term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 711 |  |
% of total class of financing receivable | 0.40% |  |
Term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 2,442 |  |
% of total class of financing receivable | 0.30% |  |
Term extension | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 955 |  |
% of total class of financing receivable | 0.40% |  |
Principal forgiveness |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 974 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 42 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 40 |  |
% of total class of financing receivable | 0.10% |  |
Principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 1 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 932 |  |
% of total class of financing receivable | 0.10% |  |
Principal forgiveness | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 932 |  |
% of total class of financing receivable | 0.10% |  |
Principal forgiveness | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 932 |  |
% of total class of financing receivable | 0.10% |  |
Principal forgiveness | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 539 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 93 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 93 |  |
% of total class of financing receivable | 0.20% |  |
Combination - interest rate reduction and term extension | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 446 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 446 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 446 |  |
% of total class of financing receivable | 0.10% |  |
Combination - interest rate reduction and term extension | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 546 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 546 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 2 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 525 |  |
% of total class of financing receivable | 0.70% |  |
Combination - interest rate reduction and principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 19 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction and principal forgiveness | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 3,977 |  |
% of total class of financing receivable | 0.10% |  |
Combination - term extension and principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 365 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 365 |  |
% of total class of financing receivable | 0.70% |  |
Combination - term extension and principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 220 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 220 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 220 |  |
% of total class of financing receivable | 0.00% |  |
Combination - term extension and principal forgiveness | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 3,392 |  |
% of total class of financing receivable | 1.30% |  |
Combination - interest rate reduction, term extension and principal forgiveness |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 327 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Consumer borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Consumer borrowers | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 327 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers | Non-recourse Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 327 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Real estate companies |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 327 |  |
% of total class of financing receivable | 0.00% |  |
Combination - interest rate reduction, term extension and principal forgiveness | Loans to Equity Method Investees |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Amortized cost basis | ¥ 0 |  |
% of total class of financing receivable | 0.00% |  |

X
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