v3.26.1
Short-Term Borrowings and Long-Term Debt (Details of Other Short-Term Borrowings) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Short-term Debt [Line Items]    
Borrowings from the Bank of Japan ¥ 214,052 ¥ 2,270,980
Other 262,607 404,119
Total 2,922,999 5,537,351
Mizuho Financial Group, Inc.    
Short-term Debt [Line Items]    
Commercial paper and short-term notes issued [1],[2] 2,275,299 2,705,133
Consolidated VIEs    
Short-term Debt [Line Items]    
Commercial paper and short-term notes issued [1] 171,041 157,118
Total ¥ 277,787 ¥ 401,275
[1] Short-term notes are issued under the laws of Japan in the form of commercial paper.
[2] The amounts of commercial paper and short-term notes issued by MHFG’s subsidiaries were ¥2,138,133 million and ¥567,000 million, respectively, at March 31, 2025, and ¥1,921,799 million and ¥353,500 million, respectively, at March 31, 2026.