v3.26.1
Employee Benefits - Personnel Expenses Included in Consolidated Statements of Income (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of defined benefit plans [abstract]      
Personnel expenses ¥ 2,021,349 ¥ 1,934,596 ¥ 1,807,731