Employee Benefits - Summary of Defined Benefit Obligation And Unfunded Defined Benefit Obligation (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Japanese plans [Member]
Disclosure of defined benefit plans [line items]
Plan assets	¥ (1,952,578)	¥ (2,081,009)
The impact of minimum funding requirement and asset ceiling	718,851	572,107	¥ 268,228
Total	243,769	220,652
Japanese plans [Member] \| Funded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	1,076,271	1,265,948
Total	(157,457)	(242,954)
Japanese plans [Member] \| Unfunded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	401,226	463,606
Foreign plans [Member]
Disclosure of defined benefit plans [line items]
Plan assets	(1,410,042)	(1,271,236)
The impact of minimum funding requirement and asset ceiling	0	0
Total	391,088	350,817
Foreign plans [Member] \| Funded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	1,342,118	1,225,195
Total	(67,924)	(46,040)
Foreign plans [Member] \| Unfunded defined benefit obligations [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligations	¥ 459,012	¥ 396,857

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 2025-01-01
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2025-03-27

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