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Fair value measurements (Schedule of Changes in Level 3 Instruments) (Details)
¥ in Thousands
 12 Months Ended
Dec. 31, 2018
CNY (¥)
Liabilities measured at fair value [Line Items]  
Fair value loss on derivative liabilities ¥ 2,285,223
Level 3 [Member]  
Liabilities measured at fair value [Line Items]  
Balance as of January 1, 2018 0
Initial recognition upon the extinguishment of Huya's Series A Preferred Shares and the issuance of  Huya's Series B-2 Preferred Shares as of March 8, 2018 892,334
Fair value loss on derivative liabilities 2,285,223
Foreign exchange 11,270
Derecognition of derivative liabilities upon the completion of Huya's IPO (3,188,827)
Balance as of December 31, 2018 0
Level 3 [Member] | Conversion Feature Embedded In Series A Preferred Shares [Member]  
Liabilities measured at fair value [Line Items]  
Balance as of January 1, 2018 0
Initial recognition upon the extinguishment of Huya's Series A Preferred Shares and the issuance of  Huya's Series B-2 Preferred Shares as of March 8, 2018 572,237
Fair value loss on derivative liabilities 628,298
Foreign exchange 4,573
Derecognition of derivative liabilities upon the completion of Huya's IPO (1,205,108)
Balance as of December 31, 2018 0
Level 3 [Member] | Conversion Feature Embedded In Series B Preferred Shares [Member]  
Liabilities measured at fair value [Line Items]  
Balance as of January 1, 2018 0
Initial recognition upon the extinguishment of Huya's Series A Preferred Shares and the issuance of  Huya's Series B-2 Preferred Shares as of March 8, 2018 320,097
Fair value loss on derivative liabilities 1,656,925
Foreign exchange 6,697
Derecognition of derivative liabilities upon the completion of Huya's IPO (1,983,719)
Balance as of December 31, 2018 ¥ 0