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Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Corporate debt securities      
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items]      
Transferred from level 3   ¥ 2,000 ¥ 2,991
Investment funds      
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items]      
Transferred from level 3 ¥ 610 325  
Other asset-backed securities and debt securities      
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items]      
Transferred from level 2 to level 3   ¥ 106