v3.26.1
Goodwill - Schedule of Reconciliation of Changes in Goodwill (Details) - Goodwill - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reconciliation of changes in intangible assets and goodwill [abstract]    
As of beginning of the year ¥ 5,324,430 ¥ 5,410,067
Reclassification to assets held for sale (Note 18) (11,714) (6,999)
Foreign currency translation differences and others 496,293 (78,637)
As of end of the year ¥ 5,809,010 ¥ 5,324,430