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Structured entities - Additional Information (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2022
Mar. 31, 2021
Apr. 01, 2020
Disclosure Of Structured Entities [Line Items]      
Assets in structured entities ¥ 21,271,427 ¥ 19,880,882 ¥ 18,319,771
Fair value of assets transferred to structured entities at the end of current year 187,555    
Fair value of associated financial liabilities 186,702    
Consolidated structured entities [member]      
Disclosure Of Structured Entities [Line Items]      
Assets in structured entities 628,297 ¥ 616,578 ¥ 542,777
Securitization Transaction For Some Housing Loans [Member] | Long-term borrowings [member]      
Disclosure Of Structured Entities [Line Items]      
Liabilities occurred from the securitization transactions 183,886    
Securitization Transaction For Some Housing Loans [Member] | SONY Investments And Advances In The Financial Services Segment [Member]      
Disclosure Of Structured Entities [Line Items]      
Transferred Assets That Do Not Meet The Requirement For Derecognition Of Financial Assets ¥ 182,417