Employee Benefits - Summary of Defined Benefit Obligation And Unfunded Defined Benefit Obligation (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2025	Mar. 31, 2024
Japanese plans [Member]
Disclosure of defined benefit plans [line items]
Plan assets	¥ (2,081,009)	¥ (2,128,476)
The impact of minimum funding requirement and asset ceiling	572,107	268,228
Total	220,652	38,092
Japanese plans [Member] \| Funded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	1,265,948	1,415,507
Total	(242,954)	(444,741)
Japanese plans [Member] \| Unfunded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	463,606	482,833
Foreign plans [Member]
Disclosure of defined benefit plans [line items]
Plan assets	(1,271,236)	(1,284,918)
The impact of minimum funding requirement and asset ceiling	0	0
Total	350,817	366,098
Foreign plans [Member] \| Funded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	1,225,195	1,250,773
Total	(46,040)	(34,145)
Foreign plans [Member] \| Unfunded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	¥ 396,857	¥ 400,243

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2024-03-27

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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.

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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- Definition

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