v3.26.1
Shareholders' Equity - Movements of Own Credit On Financial Liabilities Designated at Fair Value through Profit or Loss Reserve (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
At beginning of period ¥ 16,488,594 ¥ 16,279,098 ¥ 13,536,965
Gains (losses) arising during the period, before tax 635 9,511 (11,900)
Income tax (expense) benefit for changes arising during the period (289,732) 15,442 (510,012)
At end of period 18,288,994 16,488,594 16,279,098
Own credit on financial liabilities designated at fair value through profit or loss reserve [Member]      
At beginning of period 7,675 1,177 9,433
Gains (losses) arising during the period, before tax 635 9,511 (11,900)
Income tax (expense) benefit for changes arising during the period (200) (3,013) 3,644
At end of period ¥ 8,110 ¥ 7,675 ¥ 1,177