Principal Accounting Policies - Contract Balances and Practical Expedients (Details) ¥ in Millions	12 Months Ended
Dec. 31, 2025 CNY (¥)
Accounting Policies [Abstract]
Revenue recognized included in beginning contract liability	¥ 18.9
Election of revenue recognition practical expedient, financing component	true

Indicates (true false) whether practical expedient was elected not to adjust consideration for effect of financing component when transfer and customer payment for product or service occurs within one year or less.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-22

Name:	us-gaap_RevenuePracticalExpedientFinancingComponent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration