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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2023
Mar. 31, 2023
Variable Interest Entity [Line Items]    
Total assets ¥ 15,795,220 ¥ 15,289,385
Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 21,934 14,054
Investments 276,078 151,539
Maximum exposure to loss [1] 409,830 253,202
Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 19,264,663 14,188,544
Liquidating customer assets | Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 991 991
Maximum exposure to loss [1] 991 991
Liquidating customer assets | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 8,225 8,247
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 18,201 10,721
Investments 9,434 8,805
Maximum exposure to loss [1] 28,765 20,526
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 890,013 648,468
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Non Consolidated VIEs    
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 | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 0 0
Corporate rehabilitation support business | Non Consolidated VIEs    
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 | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 0 0
Investment in securities | Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 217,074 98,742
Maximum exposure to loss [1] 309,082 173,314
Investment in securities | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 15,008,420 10,887,430
Securitizing financial assets such as finance lease receivable and loan receivable | Non Consolidated VIEs    
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 | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 0 0
Securitization of loan receivable originated by third parties | Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 10,958 10,475
Maximum exposure to loss [1] 10,958 10,475
Securitization of loan receivable originated by third parties | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 1,225,527 901,544
Power generation projects | Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 0 0
Investments 2,436 3,691
Maximum exposure to loss [1] 4,486 4,491
Power generation projects | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 15,872 16,138
Other VIEs | Non Consolidated VIEs    
Variable Interest Entity [Line Items]    
Non-recourse loans 3,733 3,333
Investments 35,185 28,835
Maximum exposure to loss [1] 55,548 43,405
Other VIEs | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets ¥ 2,116,606 ¥ 1,726,717
[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.