v3.26.1
Short-Term and Long-Term Debt (Repayment Schedule for Next Five Years and Thereafter for Long-Term Debt) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Debt Disclosure [Abstract]    
2027 ¥ 1,032,088  
2028 967,289  
2029 999,338  
2030 808,330  
2031 702,692  
Thereafter 1,456,022  
Total ¥ 5,965,759 ¥ 5,733,118