v3.26.1
Net Income From Financial Assets And Liabilities At Fair Value Through Profit Or Loss - Summary of Net Income from Financial Assets at Fair Value Through Profit or Loss (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Net income from financial assets mandatorily at fair value through profit or loss:      
Net income (loss) from financial liabilities designated at fair value through profit or loss ¥ 16,937 ¥ 8,268 ¥ (11,502)
Total net income from financial assets and liabilities at fair value through profit or loss 332,654 43,524 323,217
Debt instruments [member]      
Net income from financial assets mandatorily at fair value through profit or loss:      
Net income from financial assets mandatorily at fair value through profit or loss 320,985 37,829 328,657
Equity instruments [member]      
Net income from financial assets mandatorily at fair value through profit or loss:      
Net income from financial assets mandatorily at fair value through profit or loss ¥ (5,268) ¥ (2,573) ¥ 6,062