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Fair value measurement (Details 3)
¥ in Thousands, $ in Thousands
12 Months Ended 24 Months Ended
Nov. 01, 2019
Sep. 21, 2018
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Investment securities                
Cumulative effect of changes in accounting principles related to financial instruments       ¥ 295,965        
Cost Basis       16,071,098 ¥ 9,087,935     ¥ 18,329,057
Gross Unrealized Gains       3,952,704 1,476,834     5,008,610
Gross Unrealized Losses       (4,122,229) (513,047)     (1,920,563)
Provision for Decline in Value         (23,909)      
Fair Value       15,901,573 10,027,813   $ 3,076,375 21,417,104
Others, net                
Investment securities                
Impairment of investments     ¥ 1,612,139 593,138 59,987      
China Unicom                
Investment securities                
Gross Unrealized Losses       (1,215,227) ¥ (366,032)     (688,141)
Percentage of outstanding ordinary shares subscribed or held         2.40%      
Total consideration for the investment         ¥ 5,000,000      
Vipshop                
Investment securities                
Gross Unrealized Gains               1,077,422
Gross Unrealized Losses       (2,004,447) ¥ (37,064)      
Percentage of outstanding ordinary shares subscribed or held         5.50%      
Total consideration for the investment         ¥ 2,794,547 ¥ 1,121,792    
Farfetch                
Investment securities                
Gross Unrealized Gains       2,250,113       159,589
Total consideration for the investment   ¥ 186,155     2,713,285      
ESR cayman limited                
Investment securities                
Gross Unrealized Gains               1,777,252
Total consideration for the investment       1,952,325        
Percentage of disposal 3.40%              
Significant Other Observable Inputs (Level 2)                
Investment securities                
Unsecured senior notes       6,382,604 6,527,960     7,195,427
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Others, net                
Investment securities                
Impairment of investments     ¥ 1,612,139 593,138 59,987      
Time deposits | Significant Other Observable Inputs (Level 2)                
Investment securities                
Time deposits       12,050,507 ¥ 5,081,748     ¥ 11,189,560
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