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Fair value measurement (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Assets        
Investment securities $ 3,076,375 ¥ 21,417,104 ¥ 15,901,573 ¥ 10,027,813
Recurring basis        
Assets        
Restricted cash   2,940,859 3,239,613 4,110,210
Total assets   51,155,353 21,077,379 24,092,959
Recurring basis | Wealth management products        
Assets        
Short-term investments   23,206,770 1,934,820 8,582,754
Recurring basis | Listed equity securities        
Assets        
Investment securities   21,417,104 15,901,573 10,027,813
Recurring basis | Money market funds        
Assets        
Cash equivalents   3,590,620 1,373 1,372,182
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Assets        
Total assets   25,007,724 15,902,946 11,399,995
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities        
Assets        
Investment securities   21,417,104 15,901,573 10,027,813
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds        
Assets        
Cash equivalents   3,590,620 1,373 1,372,182
Recurring basis | Significant Other Observable Inputs (Level 2)        
Assets        
Restricted cash   2,940,859 3,239,613 4,110,210
Total assets   26,147,629 5,174,433 12,692,964
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products        
Assets        
Short-term investments   ¥ 23,206,770 ¥ 1,934,820 ¥ 8,582,754