The number of shares authorised.

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The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Total for all associates [member]; Total for all subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Percentage of total amount of capital reserve and retained earnings reserves to stated capital, no further appropriations are required when it reaches this percentage under the Companies Act.

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Percentage of distributions from surplus appropriated as capital or retained earnings reserve.

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Retained earnings available for dividend payments

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Retained earnings undistributed earnings associates and joint ventures.

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Statements [Line Items].

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Equity and Other Equity Items - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Statements [Line Items]
Number of authorized shares	50,000,000,000	50,000,000,000	50,000,000,000
Retained earnings, available for dividend payments	¥ 18,333,862	¥ 16,723,895
undistributed earnings [Member]
Statements [Line Items]
Retained earnings related to the equity in undistributed earnings of companies accounted for by the equity method	¥ 3,751,118
Treasury shares [Member]
Statements [Line Items]
Shares held in the entity by the entity or its subsidiaries	2,746,057,686	2,840,815,433	2,749,807,731
Top of range [Member] \| Capital surplus and retained earnings [Member]
Statements [Line Items]
Percentage of total amount of capital reserve and retained earnings reserves to stated capital	25.00%	25.00%
Bottom of range [Member] \| Capital surplus and retained earnings [Member]
Statements [Line Items]
Percentage of distributions from surplus appropriated as capital or retained earnings reserve	10.00%	10.00%