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Principal accounting policies (Schedule of Amortization of Finite-lived Intangible Assets is Computed Using Straight-line Method Over Following Estimated Useful Lives) (Details)
 12 Months Ended
Dec. 31, 2019
Trademark  
Intangible assets, net [Line Items]  
Estimated useful lives 10 years
User bases  
Intangible assets, net [Line Items]  
Estimated useful lives 3 years
License  
Intangible assets, net [Line Items]  
Estimated useful lives 15 years
Non-compete agreement  
Intangible assets, net [Line Items]  
Estimated useful lives 1 year
Operating rights  
Intangible assets, net [Line Items]  
Estimated useful lives Shorter of the economic life or contract terms
Software | Minimum  
Intangible assets, net [Line Items]  
Estimated useful lives 1 year
Software | Maximum  
Intangible assets, net [Line Items]  
Estimated useful lives 5 years
Domain names | Maximum  
Intangible assets, net [Line Items]  
Estimated useful lives 15 years
Technology | Maximum  
Intangible assets, net [Line Items]  
Estimated useful lives 5 years
Others  
Intangible assets, net [Line Items]  
Estimated useful lives Shorter of the economic life or contract terms
Land Use Rights [Member]  
Intangible assets, net [Line Items]  
Term Of Amortization 40 years