v3.26.1
Investments Accounted for Using the Equity Method - Equity in Affiliates and Joint Ventures (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Investments accounted for using the equity method [abstract]      
Investments accounted for using the equity method, Affiliates ¥ 836,276 ¥ 854,536  
Investments accounted for using the equity method, Joint ventures 291,842 388,078  
Investments accounted for using the equity method, Total ¥ 1,128,118 ¥ 1,242,614 ¥ 1,206,968