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Fair value measurement (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Assets      
Investment securities ¥ 39,085,150 $ 5,990,061 ¥ 21,417,104
Recurring basis      
Assets      
Restricted cash 4,434,448   2,940,859
Total assets 67,813,699   51,155,353
Recurring basis | Wealth management products      
Assets      
Short-term investments 24,294,101   23,206,770
Recurring basis | Listed equity securities      
Assets      
Investment securities 39,085,150   21,417,104
Recurring basis | Money market funds      
Assets      
Cash equivalents     3,590,620
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets      
Total assets 39,085,150   25,007,724
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities      
Assets      
Investment securities 39,085,150   21,417,104
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Assets      
Cash equivalents     3,590,620
Recurring basis | Significant Other Observable Inputs (Level 2)      
Assets      
Restricted cash 4,434,448   2,940,859
Total assets 28,728,549   26,147,629
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products      
Assets      
Short-term investments ¥ 24,294,101   ¥ 23,206,770