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Share-based compensation (Details 2)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Additional disclosures                    
Share-based compensation expenses | ¥   ¥ 3,694,955   ¥ 3,659,989   ¥ 2,780,062        
Share Incentive Plan | Employee and non-employee                    
Share-based compensation                    
Number of ordinary shares available for future grants 141,383,893             141,383,893    
Share Incentive Plan | Employee and non-employee | Unvested RSUs | Service-based                    
Number of Shares                    
Unvested at the beginning of the year (in shares) 118,496,092 118,496,092 106,045,892 106,045,892 82,847,816 82,847,816        
Granted (in shares) 33,202,744 33,202,744 40,383,436 40,383,436 41,450,212 41,450,212        
Vested (in shares) (20,423,568) (20,423,568) (16,137,554) (16,137,554) (12,005,700) (12,005,700)        
Forfeited or cancelled (30,444,064) (30,444,064) (11,795,682) (11,795,682) (6,246,436) (6,246,436)        
Unvested at the end of the year (in shares) 100,831,204 100,831,204 118,496,092 118,496,092 106,045,892 106,045,892 82,847,816      
Weighted-Average Grant-Date Fair Value                    
Unvested at the beginning of the year (in dollars per share) | $ / shares $ 15.58   $ 13.77   $ 11.97          
Granted (in dollars per share) | $ / shares 14.29   18.95   16.27          
Vested (in dollars per share) | $ / shares 14.96   12.47   10.14          
Forfeited or cancelled | $ / shares 15.36   15.16   13.42          
Unvested at the end of the year (in dollars per share) | $ / shares $ 15.35   $ 15.58   $ 13.77   $ 11.97      
Additional disclosures                    
Share-based compensation expenses | ¥   ¥ 2,958,847   ¥ 2,968,468   ¥ 2,462,881        
Unrecognized share-based compensation expense related to awards other than options | ¥               ¥ 6,000,108    
Weighted-average period over which share-based compensation expense is expected to be recognized 4 years 8 months 12 days 4 years 8 months 12 days                
Total fair value of RSUs vested $ 312,962 ¥ 2,125,609 $ 295,632 1,892,221 $ 213,155 1,438,012        
Total intrinsic value of RSUs vested $ 312,962 ¥ 2,125,609 $ 295,632 ¥ 1,892,221 $ 213,155 ¥ 1,438,012        
Share Incentive Plan | Employee and non-employee | Unvested RSUs | Performance-based                    
Number of Shares                    
Unvested at the beginning of the year (in shares) 79,546 79,546 213,486 213,486 310,002 310,002        
Granted (in shares)     0 0            
Vested (in shares) (39,772) (39,772) (103,788) (103,788) (96,516) (96,516)        
Forfeited or cancelled (19,888) (19,888) (30,152) (30,152)            
Unvested at the end of the year (in shares) 19,886 19,886 79,546 79,546 213,486 213,486 310,002      
Weighted-Average Grant-Date Fair Value                    
Unvested at the beginning of the year (in dollars per share) | $ / shares $ 6.33   $ 6.33   $ 6.33          
Granted (in dollars per share) | $ / shares     0              
Vested (in dollars per share) | $ / shares 6.33   6.33   6.33          
Forfeited or cancelled | $ / shares 6.33   6.33              
Unvested at the end of the year (in dollars per share) | $ / shares $ 6.33   $ 6.33   $ 6.33   $ 6.33      
Additional disclosures                    
Unrecognized share-based compensation expense related to awards other than options | ¥               ¥ 76    
Weighted-average period over which share-based compensation expense is expected to be recognized 1 year 1 month 6 days 1 year 1 month 6 days                
Total fair value of RSUs vested $ 494 ¥ 3,312 $ 2,555 ¥ 16,181 $ 1,371 ¥ 9,400        
Total intrinsic value of RSUs vested $ 494 ¥ 3,312 $ 2,555 ¥ 16,181 $ 1,371 ¥ 9,400        
Share Incentive Plan | Employee and non-employee | Options | Service-based                    
Number of share options                    
Outstanding at the beginning of the year (in shares) 15,747,736 15,747,736 17,110,108 17,110,108 21,659,016 21,659,016        
Granted (in shares) 0 0 0 0 0 0        
Exercised (in shares) (3,299,962) (3,299,962) (1,077,036) (1,077,036) (4,116,816) (4,116,816)        
Forfeited or cancelled (2,223,650) (2,223,650) (285,336) (285,336) (432,092) (432,092)        
Outstanding at the end of the year (in shares) 10,224,124 10,224,124 15,747,736 15,747,736 17,110,108 17,110,108 21,659,016      
Vested and expected to vest at the end of the year (in shares) 10,038,113             10,038,113    
Exercisable at the end of the year (in shares) 9,129,940             9,129,940    
Weighted Average Exercise Price                    
Outstanding at the beginning of the year (in dollars per share) | $ / shares $ 6.55   $ 6.49   $ 6.23          
Exercised (in dollars per share) | $ / shares 5.72   5.23   5.20          
Forfeited or cancelled (in dollars per share) | $ / shares 8.52   7.68   5.92          
Outstanding at the end of the year (in dollars per share) | $ / shares 6.39   $ 6.55   $ 6.49   $ 6.23      
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares 6.29                  
Exercisable at the end of the year (in dollars per share) | $ / shares $ 5.72                  
Weighted Average Remaining Contractual Term (years)                    
Outstanding at the end of the year 4 years 3 months 18 days 4 years 3 months 18 days 5 years 3 months 18 days 5 years 3 months 18 days 6 years 2 months 12 days 6 years 2 months 12 days 7 years 3 months 18 days      
Vested and expected to vest at the end of the year 4 years 2 months 12 days 4 years 2 months 12 days                
Exercisable at the end of the year 4 years 1 month 6 days 4 years 1 month 6 days                
Aggregate Intrinsic Value                    
Outstanding at the end of the year (in dollars) | $ $ 114,720   $ 72,658   $ 243,327   $ 142,433      
Vested and expected to vest at the end of the year (in dollars) | $ 113,679                  
Exercisable at the end of the year (in dollars) | $ $ 108,594                  
Additional disclosures                    
Share-based compensation expenses | ¥   ¥ 3,837   ¥ 32,558   ¥ 60,739        
Unrecognized share-based compensation expense related to options | ¥               ¥ 15,777    
Weighted-average period over which share-based compensation expense is expected to be recognized 2 years 4 months 24 days 2 years 4 months 24 days                
Total intrinsic value of options exercised $ 31,762 ¥ 219,918 15,326 99,267 55,278 377,062        
Cash received from the exercises of share options 16,201 ¥ 112,153 7,382 ¥ 48,555 19,942 ¥ 135,745        
Cash Receivable From Stock Option Exercises $ 3,127   $ 449   $ 2,201     ¥ 21,813 ¥ 3,084 ¥ 14,380
Share Incentive Plan | Non-employees | Unvested RSUs | Service-based                    
Number of Shares                    
Unvested at the beginning of the year (in shares) 5,798,970 5,798,970 5,719,884 5,719,884            
Unvested at the end of the year (in shares) 4,478,140 4,478,140 5,798,970 5,798,970 5,719,884 5,719,884        
Share Incentive Plan | Non-employees | Options | Service-based                    
Number of share options                    
Outstanding at the beginning of the year (in shares) 1,211,214 1,211,214 1,379,780 1,379,780            
Outstanding at the end of the year (in shares) 1,072,212 1,072,212 1,211,214 1,211,214 1,379,780 1,379,780        
Share Incentive Plan | Year two | Employee and non-employee | RSUs and options                    
Share-based compensation                    
Vesting schedule 2 years 2 years                
Vesting percentage (as a percent) 50.00% 50.00%                
Share Incentive Plan | Year three | Employee and non-employee | RSUs and options                    
Share-based compensation                    
Vesting schedule 3 years 3 years                
Vesting percentage (as a percent) 33.00% 33.00%                
Share Incentive Plan | Year four | Employee and non-employee | RSUs and options                    
Share-based compensation                    
Vesting schedule 4 years 4 years                
Vesting percentage (as a percent) 25.00% 25.00%                
Share Incentive Plan | Year five | Employee and non-employee | RSUs and options                    
Share-based compensation                    
Vesting schedule 5 years 5 years                
Vesting percentage (as a percent) 20.00% 20.00%                
Share Incentive Plan | Year six | Employee and non-employee | RSUs and options                    
Share-based compensation                    
Vesting schedule 6 years 6 years                
Vesting percentage (as a percent) 17.00% 17.00%                
Share Incentive Plan | Year ten | Employee and non-employee | RSUs and options                    
Share-based compensation                    
Vesting schedule 10 years 10 years                
Vesting percentage (as a percent) 10.00% 10.00%                
Share Incentive Plan | Multiple tranches with tiered vesting commencement dates from 2016 to 2025 | Employee and non-employee                    
Share-based compensation                    
Vesting schedule 6 years 6 years