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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.