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Right of Use Assets and Lease Liabilities - Summary of Right of Use Asset and Lease Liability (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Types of Original Assets    
Types of Original Assets ¥ 901,232 ¥ 583,068
Land [Member]    
Types of Original Assets    
Types of Original Assets 73,425 73,694
Buildings [Member]    
Types of Original Assets    
Types of Original Assets 460,788 355,489
Other [Member]    
Types of Original Assets    
Types of Original Assets ¥ 367,019 ¥ 153,885