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Borrowings - Short-term and long-term borrowings (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Long-term borrowings from banks and other financial institutions [Member]    
Schedule of Borrowings [Line Items]    
Secured borrowings ¥ 670,182 ¥ 472,328
Bonds and notes issued [Member]    
Schedule of Borrowings [Line Items]    
Secured borrowings 720,958 811,118
Short-term borrowings [Member]    
Schedule of Borrowings [Line Items]    
Secured borrowings ¥ 113,315 ¥ 119,682