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Variable Interest Entities (Information about Consolidated VIEs) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | ¥ 16,866,251 | ¥ 16,322,100 | ¥ 15,289,385
Total Liabilities |  | 12,691,036 | 12,297,490 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 343,097 | 534,868 |
Total Liabilities |  | 216,634 | 369,868 |
Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 626,060 | 892,174 |
Total Liabilities | [1] | 219,729 | 387,333 |
Assets which are pledged as collateral | [2] | 343,097 | 534,868 |
Commitments | [3] | 142,028 | 119,668 |
Acquisition of real estate and real estate development projects for customers | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 0 | 1,657 |
Total Liabilities | [1] | 0 | 1 |
Assets which are pledged as collateral | [2] | 0 | 0 |
Commitments | [3] | 0 | 0 |
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 51,025 | 51,654 |
Total Liabilities | [1] | 10,956 | 10,461 |
Assets which are pledged as collateral | [2] | 16,769 | 16,434 |
Commitments | [3] | 0 | 0 |
Corporate rehabilitation support business | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 5,069 | 5,043 |
Total Liabilities | [1] | 8 | 29 |
Assets which are pledged as collateral | [2] | 0 | 0 |
Commitments | [3] | 0 | 0 |
Investment in securities | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 225,040 | 217,715 |
Total Liabilities | [1] | 111 | 117 |
Assets which are pledged as collateral | [2] | 0 | 0 |
Commitments | [3] | 85,069 | 77,566 |
Securitizing financial assets such as finance lease receivable and loan receivable | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 85,765 | 213,615 |
Total Liabilities | [1] | 66,914 | 165,062 |
Assets which are pledged as collateral | [2] | 85,765 | 213,615 |
Commitments | [3] | 0 | 0 |
Securitization of loan receivable originated by third parties | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 0 | 497 |
Total Liabilities | [1] | 0 | 1,015 |
Assets which are pledged as collateral | [2] | 0 | 497 |
Commitments | [3] | 0 | 0 |
Power generation projects | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 112,360 | 236,715 |
Total Liabilities | [1] | 76,429 | 156,000 |
Assets which are pledged as collateral | [2] | 105,499 | 181,610 |
Commitments | [3] | 56,959 | 42,102 |
Other VIEs | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | [1] | 146,801 | 165,278 |
Total Liabilities | [1] | 65,311 | 54,648 |
Assets which are pledged as collateral | [2] | 135,064 | 122,712 |
Commitments | [3] | ¥ 0 | ¥ 0 |
[1] | The assets of most VIEs are used only to repay the liabilities of the VIEs, and the creditors of the liabilities of most VIEs have no recourse to other assets of the Company and its subsidiaries.
[2] | The assets are pledged as collateral by VIE for financing of the VIE.
[3] | This item represents remaining balance of commitments that could require the Company and its subsidiaries to provide investments or loans to the VIE.

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