v3.26.1
Variable Interest Entities (Information about Consolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Variable Interest Entity [Line Items]      
Total assets ¥ 18,002,776 ¥ 16,866,251 ¥ 16,322,100
Total Liabilities 13,378,965 12,691,036  
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 235,746 343,097  
Total Liabilities 155,206 216,634  
Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Total assets [1] 648,412 626,060  
Total Liabilities [1] 162,601 219,729  
Assets which are pledged as collateral [2] 235,746 343,097  
Commitments [3] 364,664 142,028  
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] 33,144 51,025  
Total Liabilities [1] 3,131 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] 325,307 225,040  
Total Liabilities [1] 363 111  
Assets which are pledged as collateral [2] 0 0  
Commitments [3] 326,644 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] 46,018 85,765  
Total Liabilities [1] 33,286 66,914  
Assets which are pledged as collateral [2] 46,018 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] 121,050 112,360  
Total Liabilities [1] 68,964 76,429  
Assets which are pledged as collateral [2] 98,895 105,499  
Commitments [3] 38,020 56,959  
Other VIEs | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Total assets [1] 122,893 146,801  
Total Liabilities [1] 56,857 65,311  
Assets which are pledged as collateral [2] 90,833 135,064  
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.