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Financial instruments - Summary of Balances of the Non-Marketable Instruments Measured at Fair Value Through Other Comprehensive Income by Major Sector Categories (Detail) - Non Marketable Equity Instruments [Member] - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Non-marketable instruments measured at fair value through other comprehensive income ¥ 302,488 ¥ 249,181
Entertainment Sector [Member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Non-marketable instruments measured at fair value through other comprehensive income [1] 181,000 187,294
Manufacturing Sector [Member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Non-marketable instruments measured at fair value through other comprehensive income [2] 91,099 34,610
Information Technology Communication and Service Sector [Member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Non-marketable instruments measured at fair value through other comprehensive income [3] ¥ 27,987 ¥ 24,348
[1] Major investments included Epic Games, Inc.
[2] Major investments included Nichia Corporation as of March 31, 2024.
[3] Major investments included Semiconductor Energy Laboratory Co., Ltd.