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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Cash and cash equivalents [abstract]        
Cash and deposits ¥ 6,344,691 ¥ 6,245,257    
Negotiable certificate of deposit and other 2,637,713 3,166,803    
Total ¥ 8,982,404 ¥ 9,412,060 ¥ 7,516,966 ¥ 6,113,655