v3.26.3
Variable Interest Entities (Information about Consolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2026
Mar. 31, 2026
Variable Interest Entity [Line Items]    
Total assets ¥ 15,606,595 ¥ 18,002,776
Total Liabilities 10,383,369 13,378,965
Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Total assets [1] 448,334 643,354
Total Liabilities [1] 123,034 158,016
Assets which are pledged as collateral [2] 197,998 230,688
Commitments [3] 359,432 364,664
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] 33,476 33,144
Total Liabilities [1] 4,993 3,131
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] 164,311 325,307
Total Liabilities [1] 382 363
Assets which are pledged as collateral [2] 0 0
Commitments [3] 321,668 326,644
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] 36,478 40,960
Total Liabilities [1] 17,087 28,701
Assets which are pledged as collateral [2] 36,478 40,960
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] 121,282 121,050
Total Liabilities [1] 65,186 68,964
Assets which are pledged as collateral [2] 98,060 98,895
Commitments [3] 37,764 38,020
Other VIEs | Variable Interest Entity, Primary Beneficiary [Member] | Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Total assets [1] 92,787 122,893
Total Liabilities [1] 35,386 56,857
Assets which are pledged as collateral [2] 63,460 90,833
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.