Principal Accounting Policies - Contract Balances and Practical Expedients (Details) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Revenue recognized included in beginning contract liability	¥ 19.0	¥ 24.8
Election of revenue recognition practical expedient, financing component	true
Fair value practical expedient in ASC Topic 820	true

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration