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Variable Interest Entities (Information about Consolidated VIEs) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets |  | ¥ 17,604,283 | ¥ 16,866,251
Total Liabilities |  | 13,034,239 | 12,691,036
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 272,655 | 343,097
Total Liabilities |  | 172,229 | 216,634
Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | [1] | 602,841 | 626,060
Total Liabilities | [1] | 176,692 | 219,729
Assets which are pledged as collateral | [2] | 272,655 | 343,097
Commitments | [3] | 143,499 | 142,028
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 | 0
Total Liabilities | [1] | 0 | 0
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] | 33,737 | 51,025
Total Liabilities | [1] | 2,679 | 10,956
Assets which are pledged as collateral | [2] | 0 | 16,769
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] | 0 | 5,069
Total Liabilities | [1] | 0 | 8
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] | 258,607 | 225,040
Total Liabilities | [1] | 137 | 111
Assets which are pledged as collateral | [2] | 0 | 0
Commitments | [3] | 84,854 | 85,069
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] | 29,404 | 85,765
Total Liabilities | [1] | 27,793 | 66,914
Assets which are pledged as collateral | [2] | 29,404 | 85,765
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 | 0
Total Liabilities | [1] | 0 | 0
Assets which are pledged as collateral | [2] | 0 | 0
Commitments | [3] | 0 | 0
Power generation projects | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | [1] | 112,142 | 112,360
Total Liabilities | [1] | 72,764 | 76,429
Assets which are pledged as collateral | [2] | 103,348 | 105,499
Commitments | [3] | 58,645 | 56,959
Other VIEs | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | [1] | 168,951 | 146,801
Total Liabilities | [1] | 73,319 | 65,311
Assets which are pledged as collateral | [2] | 139,903 | 135,064
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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