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Investments in associates and joint ventures - Summary of Investments in Associates and Joint Ventures (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Investments in joint ventures and associates [line items]    
Total ¥ 347,718 ¥ 423,744
Aggregated individually immaterial associates and joint ventures [member]    
Investments in joint ventures and associates [line items]    
Associates 303,321 363,611
Joint ventures 44,397 60,133
Total ¥ 347,718 ¥ 423,744