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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Variable Interest Entity [Line Items]      
Total assets ¥ 15,266,191 ¥ 14,270,672 ¥ 13,563,082
Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 14,054 11,679  
Investments 151,539 119,916  
Maximum exposure to loss [1] 253,202 191,586  
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 14,188,544 9,617,334  
Liquidating customer assets | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 405  
Investments 991 991  
Maximum exposure to loss [1] 991 1,396  
Liquidating customer assets | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 8,247 13,391  
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 10,721 8,134  
Investments 8,805 9,119  
Maximum exposure to loss [1] 20,526 18,735  
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 648,468 546,953  
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 98,742 79,050  
Maximum exposure to loss [1] 173,314 123,674  
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 10,887,430 6,901,686  
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 2  
Maximum exposure to loss [1] 0 2  
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 0 154  
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 0  
Investments 10,475 15,254  
Maximum exposure to loss [1] 10,475 15,254  
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 901,544 1,231,246  
Power generation projects | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 0 0  
Investments 3,691 402  
Maximum exposure to loss [1] 4,491 402  
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets 16,138 9,103  
Other VIEs | Non Consolidated VIEs [Member]      
Variable Interest Entity [Line Items]      
Non-recourse loans 3,333 3,140  
Investments 28,835 15,098  
Maximum exposure to loss [1] 43,405 32,123  
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total assets ¥ 1,726,717 ¥ 914,801  
[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.