v3.25.2
Related party transactions - Additional information (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of transactions between related parties [line items]    
Investment commitments amount, related party transactions   ¥ 5,905
Joint ventures    
Disclosure of transactions between related parties [line items]    
Estimated financial effect of contingent liabilities ¥ 3,856