v3.26.1
Commitments, Guarantees and Contingent Liabilities (Amounts Due of Certain Computer Systems Operated and Maintained under Non-cancelable Contracts with Third-party Service Providers) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]    
2026   ¥ 5,809
2027 ¥ 8,029 4,618
2028 5,359 2,884
2029 1,382 106
2030 802 51
2031 208  
On or after 2031   1
On or after 2032 0  
Total ¥ 15,780 ¥ 13,469