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Principal Accounting Policies - Share-based compensation (Details) | 12 Months Ended
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Dec. 31, 2022
Share based Compensation |
Number of preceding years considered for estimating forfeiture | 5 years
2009 Restricted Share Unit Plan and 2019 Restricted Share Unit Plan | Restricted share units | Equal to or more than |
Share based Compensation |
Service vesting period | 1 year
2009 Restricted Share Unit Plan and 2019 Restricted Share Unit Plan | Restricted share units | Less than |
Share based Compensation |
Service vesting period | 5 years
Certain subsidiaries | Stock Options | Equal to or more than |
Share based Compensation |
Expiration period | 4 years
Certain subsidiaries | Stock Options | Less than |
Share based Compensation |
Expiration period | 10 years

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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