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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Variable Interest Entity [Line Items]      
Total assets ¥ 16,322,100 ¥ 15,289,385 ¥ 14,280,684
Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 56,444 14,054  
Investments 294,870 151,539  
Maximum exposure to loss [1] 474,833 253,202  
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 28,281,876 14,188,544  
Liquidating customer assets | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 0  
Investments 0 991  
Maximum exposure to loss [1] 0 991  
Liquidating customer assets | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 0 8,247  
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 52,666 10,721  
Investments 11,773 8,805  
Maximum exposure to loss [1] 67,439 20,526  
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 1,196,344 648,468  
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 223,264 98,742  
Maximum exposure to loss [1] 318,007 173,314  
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 23,366,221 10,887,430  
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 14,691 10,475  
Maximum exposure to loss [1] 14,691 10,475  
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 1,396,339 901,544  
Power generation projects | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 0  
Investments 2,630 3,691  
Maximum exposure to loss [1] 4,680 4,491  
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 14,830 16,138  
Other VIEs | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 3,778 3,333  
Investments 42,512 28,835  
Maximum exposure to loss [1] 70,016 43,405  
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets ¥ 2,308,142 ¥ 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.