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Transfer of Financial Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Gain (losses) on sale from securitization and loan sales ¥ 34,301 ¥ 36,624 ¥ 20,635
Installment Loans      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Installment loans ¥ 1,317,496 ¥ 1,306,495 ¥ 643,422