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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Variable Interest Entity [Line Items]      
Total assets ¥ 16,866,251 ¥ 16,322,100 ¥ 15,289,385
Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 136,227 56,444  
Investments 356,194 294,870  
Maximum exposure to loss [1] 622,655 474,833  
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 37,659,824 28,281,876  
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 132,495 52,666  
Investments 11,224 11,773  
Maximum exposure to loss [1] 149,602 67,439  
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 1,859,420 1,196,344  
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 272,927 223,264  
Maximum exposure to loss [1] 375,942 318,007  
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 32,105,994 23,366,221  
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 0 0  
Maximum exposure to loss [1] 0 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 0 0  
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 0  
Investments 16,437 14,691  
Maximum exposure to loss [1] 16,437 14,691  
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 760,293 1,396,339  
Power generation projects | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 0  
Investments 3,945 2,630  
Maximum exposure to loss [1] 5,195 4,680  
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 19,499 14,830  
Other VIEs | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 3,732 3,778  
Investments 51,661 42,512  
Maximum exposure to loss [1] 75,479 70,016  
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets ¥ 2,914,618 ¥ 2,308,142  
[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.