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Fair value measurement (Details 3)
¥ in Thousands, $ in Thousands
12 Months Ended
Sep. 21, 2018
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Investment securities            
Cumulative effect of changes in accounting principles related to financial instruments           ¥ 295,965
Cost Basis     ¥ 9,087,935     16,071,098
Gross Unrealized Gains     1,476,834     3,952,704
Gross Unrealized Losses     (513,047)     (4,122,229)
Provision for decline in value     (23,909)      
Fair Value     10,027,813   $ 2,312,788 15,901,573
Others, net            
Investment securities            
Impairment of investments   ¥ 593,138 59,987 ¥ 341,984    
Significant Other Observable Inputs (Level 2)            
Investment securities            
Unsecured senior notes     6,527,960     6,382,604
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Others, net            
Investment securities            
Impairment of investments   593,138 59,987 ¥ 341,984    
Time deposits | Significant Other Observable Inputs (Level 2)            
Investment securities            
Cash equivalents     5,081,748     12,050,507
China Unicom            
Investment securities            
Gross Unrealized Losses     ¥ 366,032     (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     ¥ 37,064     (2,004,447)
Percentage of outstanding ordinary shares subscribed or held     5.50%      
Total consideration for the investment   ¥ 1,016,858 ¥ 2,794,547      
Farfetch            
Investment securities            
Gross Unrealized Gains           2,250,113
Total consideration for the investment ¥ 186,155   ¥ 2,713,285      
Accumulated other comprehensive income/(loss)            
Investment securities            
Cumulative effect of changes in accounting principles related to financial instruments           (1,156,642)
Accumulated deficit            
Investment securities            
Cumulative effect of changes in accounting principles related to financial instruments           1,452,607
ASU 2016-01 | Adjustments | Accumulated other comprehensive income/(loss)            
Investment securities            
Cumulative effect of changes in accounting principles related to financial instruments           (1,156,642)
ASU 2016-01 | Adjustments | Accumulated deficit            
Investment securities            
Cumulative effect of changes in accounting principles related to financial instruments           ¥ 1,156,642