Commitments and contingencies - Litigation and other contingencies (Details) - 1 months ended Dec. 31, 2025 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Commitments and contingencies
IFRS Payments for Legal Settlements	$ 740,000
Provision amount	$ 740,000	¥ 5,297,364

The amount of provision for legal proceedings. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2025-01-01
-Section Example 10 A court case
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10_TI
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2025-01-01
-Paragraph 87
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_87&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_LegalProceedingsProvision
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant