v3.26.1
Investments - Summary of Composition of Other Investments (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Schedule of Investments [Line Items]    
Equity method investments ¥ 978,287 ¥ 907,413
Investments held by consolidated investment companies and other 95,477 93,176
Total ¥ 1,073,764 ¥ 1,000,589