Subsequent Event - Additional Information (Detail) - Shares Repurchased [Member] shares in Millions, ¥ in Billions	May 10, 2022 JPY (¥) shares
Disclosure of non-adjusting events after reporting period [line items]
Number of shares for repurchase \| shares	25
Total purchase price for repurchase \| ¥	¥ 200
Period of repurchase	May 10, 2023

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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration