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Variable Interest Entities (Information about Non-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
Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 172,225 136,227
Investments 421,635 356,194
Maximum exposure to loss [1] 730,945 622,655
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 43,531,800 37,659,824
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 172,225 132,495
Investments 11,982 11,224
Maximum exposure to loss [1] 196,850 149,602
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 2,080,617 1,859,420
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 0 0
Maximum exposure to loss [1] 0 0
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 0 0
Corporate rehabilitation support business | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 0 0
Maximum exposure to loss [1] 0 0
Corporate rehabilitation support business | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 0 0
Investment in securities | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 317,948 272,927
Maximum exposure to loss [1] 425,015 375,942
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 37,045,631 32,105,994
Securitizing financial assets such as finance lease receivable and loan receivable | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 2,850 0
Maximum exposure to loss [1] 2,850 0
Securitizing financial assets such as finance lease receivable and loan receivable | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 5,262 0
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 15,992 16,437
Maximum exposure to loss [1] 15,992 16,437
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 652,360 760,293
Power generation projects | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 5,467 3,945
Maximum exposure to loss [1] 5,467 5,195
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets 23,946 19,499
Other VIEs | Non Consolidated VIEs [Member]    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 3,732
Investments 67,396 51,661
Maximum exposure to loss [1] 84,771 75,479
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Total assets ¥ 3,723,984 ¥ 2,914,618
[1] Maximum exposure to loss includes remaining balance of commitments that could require the Company and its subsidiaries to provide investments or loans to the VIE.