Employee benefits - Summary of Sensitivity of the Defined Benefit Obligations (Detail) - Actuarial assumption of discount rates [member] - JPY (¥) ¥ in Millions	Mar. 31, 2022	Mar. 31, 2021	Apr. 01, 2020
Japanese Defined Benefit Plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in significant weighted-average	¥ 18,069	¥ 19,965	¥ 20,722
Increase in significant weighted-average	(15,372)	(16,825)	(18,277)
Foreign Defined Benefit Plan [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in significant weighted-average	11,055	11,281	10,619
Increase in significant weighted-average	¥ (10,439)	¥ (10,431)	¥ (9,914)

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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