Supplemental consolidated statements of income information - Additional information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Material income and expense [abstract]
Research and development expense	¥ 618,368	¥ 545,357
Advertising expense	347,709	261,391
Shipping and handling costs for finished goods	¥ 70,858	¥ 82,708

The amount of expense arising from advertising.

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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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- 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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-IssueDate 2021-01-01
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