Supplemental consolidated statements of income information - Additional information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Material income and expense [abstract]
Research and development expense	¥ 734,578	¥ 742,772	¥ 735,698
Advertising expense	413,795	422,655	391,131
Shipping and handling costs for finished goods	¥ 86,762	¥ 85,108	¥ 95,208

The amount of expense arising from advertising.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of expense relating to distribution costs and administrative expenses. [Refer: Administrative expenses; Distribution costs]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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- References

No definition available.

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- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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