Basis of preparation and material accounting policies - Estimated useful life for intangible assets (Details)	12 Months Ended
Dec. 31, 2025
Industrial property rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful life for intangible assets	5 to 10 years
Development costs
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful life for intangible assets	5 years
Software and others
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful life for intangible assets	1 to 10 years

The description of intangible assets with indefinite useful life, supporting the assessment of indefinite useful life. [Refer: Intangible assets other than goodwill]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2025-01-01
-Paragraph 122
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_122_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 264
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_264_a&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 264
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_264_a&doctype=Standard
-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration