v3.26.1
Investments Accounted for Using the Equity Method - Summary of Investments in Equity Accounted Investees (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Text block 1 [Abstract]      
Associates ¥ 4,218,009 ¥ 4,887,674  
Joint ventures 1,124,539 910,377  
Total ¥ 5,342,548 ¥ 5,798,051 ¥ 5,710,106