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Fair value measurement (Details 3) - CNY (¥)
¥ in Thousands
9 Months Ended 12 Months Ended
Sep. 21, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Investment securities          
Cost Basis   ¥ 16,560,645     ¥ 16,071,098
Gross Unrealized Gains   2,056,040     3,952,704
Gross Unrealized Losses   (2,909,051)     (4,122,229)
Fair Value   15,707,634     15,901,573
Others, net          
Investment securities          
Impairment of investments   631,871 ¥ 399,027    
Significant Other Observable Inputs (Level 2)          
Investment securities          
Unsecured senior notes   7,230,696     6,382,604
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Others, net          
Investment securities          
Impairment of investments   631,871 ¥ 399,027    
Time deposits | Significant Other Observable Inputs (Level 2)          
Investment securities          
Cash equivalents   7,072,900     12,050,507
China Unicom          
Investment securities          
Gross Unrealized Losses   (600,293)     (1,215,227)
Percentage of outstanding ordinary shares subscribed or held       2.40%  
Total consideration for the investment       ¥ 5,000,000  
Vipshop          
Investment securities          
Gross Unrealized Losses   (729,198)     (2,004,447)
Percentage of outstanding ordinary shares subscribed or held       5.50%  
Total consideration for the investment   1,121,792   ¥ 2,794,547  
Farfetch          
Investment securities          
Gross Unrealized Gains         ¥ 2,250,113
Gross Unrealized Losses   ¥ (310,419)      
Total consideration for the investment ¥ 186,155     ¥ 2,713,285