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Fair value measurement (Details 3)
$ in Thousands
12 Months Ended 24 Months Ended
Nov. 01, 2019
Sep. 21, 2018
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2020
USD ($)
Investment securities                
Cost Basis     ¥ 18,078,773,000 ¥ 18,329,057,000     ¥ 18,329,057,000  
Gross Unrealized Gains     24,002,167,000 5,008,610,000     5,008,610,000  
Gross Unrealized Losses     (2,995,790,000) (1,920,563,000)     (1,920,563,000)  
Fair Value     39,085,150,000 21,417,104,000     21,417,104,000 $ 5,990,061
Others, net                
Investment securities                
Impairment of investments     201,646,000 1,612,139,000 ¥ 593,138,000      
China Unicom                
Investment securities                
Gross Unrealized Losses     (1,734,993,000) (688,141,000)     (688,141,000)  
Total consideration for the investment           ¥ 5,000,000,000    
Vipshop                
Investment securities                
Gross Unrealized Gains     5,349,265,000 1,077,422,000     1,077,422,000  
Total consideration for the investment           2,794,547,000 1,121,792,000  
Farfetch                
Investment securities                
Gross Unrealized Gains     8,519,601,000 159,589,000     159,589,000  
Total consideration for the investment   ¥ 186,155,000 ¥ 75,404,000     ¥ 2,713,285,000    
Percentage of disposal     44.20%          
ESR cayman limited                
Investment securities                
Gross Unrealized Gains     ¥ 3,267,484,000 1,777,252,000     1,777,252,000  
Total consideration for the investment         1,952,325,000      
Percentage of disposal 3.40%   8.00%          
Significant Other Observable Inputs (Level 2)                
Investment securities                
Unsecured senior notes     ¥ 14,008,251,000 7,195,427,000     7,195,427,000  
Fair value of held to maturity debt securities     17,470,000,000 0     0  
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Others, net                
Investment securities                
Impairment of investments     201,646,000 1,612,139,000 ¥ 593,138,000      
Bank Time Deposits [Member] | Significant Other Observable Inputs (Level 2)                
Investment securities                
Time deposits     36,472,769,000 11,189,560,000     11,189,560,000  
Bank Time Deposits [Member] | Significant Other Observable Inputs (Level 2) | Other Noncurrent Assets [Member]                
Investment securities                
Investment in time deposit with maturity of more than one year     ¥ 5,073,466,000 ¥ 0     ¥ 0