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Share-based compensation (Details 2)
12 Months Ended
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Additional disclosures                  
Share-based compensation expenses | ¥ ¥ 4,155,933,000   ¥ 3,694,955,000   ¥ 3,659,989,000        
Share Incentive Plan | Employee and non-employee                  
Share-based compensation                  
Number of ordinary shares available for future grants 142,927,412             142,927,412  
Share Incentive Plan | Employee and non-employee | RSU | Service-based                  
Number of Shares                  
Unvested at the beginning of the year (in shares) 100,831,204 100,831,204 118,496,092 118,496,092 106,045,892 106,045,892      
Granted (in shares) 42,621,084 42,621,084 33,202,744 33,202,744 40,383,436 40,383,436      
Vested (in shares) (20,632,596) (20,632,596) (20,423,568) (20,423,568) (16,137,554) (16,137,554)      
Forfeited or cancelled (14,550,450) (14,550,450) (30,444,064) (30,444,064) (11,795,682) (11,795,682)      
Unvested at the end of the year (in shares) 108,269,242 108,269,242 100,831,204 100,831,204 118,496,092 118,496,092 106,045,892    
Weighted-Average Grant-Date Fair Value                  
Unvested at the beginning of the year (in dollars per share) | $ / shares   $ 15.35   $ 15.58   $ 13.77      
Granted (in dollars per share) | $ / shares   26.44   14.29   18.95      
Vested (in dollars per share) | $ / shares   15.25   14.96   12.47      
Forfeited or cancelled | $ / shares   16.13   15.36   15.16      
Unvested at the end of the year (in dollars per share) | $ / shares   $ 19.62   $ 15.35   $ 15.58 $ 13.77    
Additional disclosures                  
Share-based compensation expenses | ¥ ¥ 3,084,849,000   ¥ 2,958,847,000   ¥ 2,968,468,000        
Unrecognized share-based compensation expense related to awards other than options | ¥ ¥ 7,483,273,000                
Weighted-average period over which share-based compensation expense is expected to be recognized 4 years 9 months 18 days 4 years 9 months 18 days              
Total fair value of RSUs vested ¥ 3,457,997,000 $ 493,843,000 2,125,609,000 $ 312,962,000 1,892,221,000 $ 295,632,000      
Total intrinsic value of RSUs vested ¥ 3,457,997,000 $ 493,843,000 ¥ 2,125,609,000 $ 312,962,000 ¥ 1,892,221,000 $ 295,632,000      
Share Incentive Plan | Employee and non-employee | RSU | Performance-based                  
Number of Shares                  
Unvested at the beginning of the year (in shares) 19,886 19,886 79,546 79,546 213,486 213,486      
Vested (in shares) (9,942) (9,942) (39,772) (39,772) (103,788) (103,788)      
Forfeited or cancelled     (19,888) (19,888) (30,152) (30,152)      
Unvested at the end of the year (in shares) 9,944 9,944 19,886 19,886 79,546 79,546 213,486    
Weighted-Average Grant-Date Fair Value                  
Unvested at the beginning of the year (in dollars per share) | $ / shares   $ 6.33   $ 6.33   $ 6.33      
Vested (in dollars per share) | $ / shares   6.33   6.33   6.33      
Forfeited or cancelled | $ / shares       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 | ¥ ¥ 5,000                
Weighted-average period over which share-based compensation expense is expected to be recognized 1 month 6 days 1 month 6 days              
Total fair value of RSUs vested ¥ 1,290,000 $ 187,000 ¥ 3,312,000 $ 494,000 ¥ 16,181,000 $ 2,555,000      
Total intrinsic value of RSUs vested ¥ 1,290,000 $ 187,000 ¥ 3,312,000 $ 494,000 ¥ 16,181,000 $ 2,555,000      
Share Incentive Plan | Employee and non-employee | Options | Service-based                  
Number of share options                  
Outstanding at the beginning of the year (in shares) 10,224,124 10,224,124 15,747,736 15,747,736 17,110,108 17,110,108      
Granted (in shares) 0 0 0 0 0 0      
Exercised (in shares) (5,073,294) (5,073,294) (3,299,962) (3,299,962) (1,077,036) (1,077,036)      
Forfeited or cancelled (243,770) (243,770) (2,223,650) (2,223,650) (285,336) (285,336)      
Outstanding at the end of the year (in shares) 4,907,060 4,907,060 10,224,124 10,224,124 15,747,736 15,747,736 17,110,108    
Vested and expected to vest at the end of the year (in shares) 4,833,518             4,833,518  
Exercisable at the end of the year (in shares) 4,539,348             4,539,348  
Weighted Average Exercise Price                  
Outstanding at the beginning of the year (in dollars per share) | $ / shares   $ 6.39   $ 6.55   $ 6.49      
Exercised (in dollars per share) | $ / shares   6.23   5.72   5.23      
Forfeited or cancelled (in dollars per share) | $ / shares   10.24   8.52   7.68      
Outstanding at the end of the year (in dollars per share) | $ / shares   $ 6.38   $ 6.39   $ 6.55 $ 6.49    
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares               $ 6.28  
Exercisable at the end of the year (in dollars per share) | $ / shares               $ 5.85  
Weighted Average Remaining Contractual Term (years)                  
Outstanding at the end of the year 3 years 3 years 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    
Vested and expected to vest at the end of the year 2 years 10 months 24 days 2 years 10 months 24 days              
Exercisable at the end of the year 2 years 8 months 12 days 2 years 8 months 12 days              
Aggregate Intrinsic Value                  
Outstanding at the end of the year (in dollars) | $           $ 72,658,000 $ 243,327,000 $ 184,380,000 $ 114,720,000
Vested and expected to vest at the end of the year (in dollars) | $               182,098,000  
Exercisable at the end of the year (in dollars) | $               172,970,000  
Additional disclosures                  
Share-based compensation expenses | ¥ ¥ 34,655,000   ¥ 3,837,000   ¥ 32,558,000        
Unrecognized share-based compensation expense related to options | ¥ ¥ 3,145,000                
Weighted-average period over which share-based compensation expense is expected to be recognized 1 year 1 year              
Total intrinsic value of options exercised ¥ 762,251,000 $ 110,692,000 219,918,000 $ 31,762,000 99,267,000 15,326,000      
Cash received from the exercises of share options 235,889,000 $ 33,903,000 112,153,000 $ 16,201,000 ¥ 48,555,000 $ 7,382,000      
Cash Receivable From Stock Option Exercises ¥ 5,361,000   ¥ 21,813,000         $ 822,000 $ 3,127,000
Share Incentive Plan | Non-employees | RSU | Service-based                  
Number of Shares                  
Unvested at the beginning of the year (in shares) 4,478,140 4,478,140              
Unvested at the end of the year (in shares) 3,325,796 3,325,796 4,478,140 4,478,140          
Share Incentive Plan | Non-employees | Options | Service-based                  
Number of share options                  
Outstanding at the beginning of the year (in shares) 1,072,212 1,072,212              
Outstanding at the end of the year (in shares) 71,502 71,502 1,072,212 1,072,212          
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 percentage (as a percent) 33.00% 33.00%              
Share Incentive Plan | Year four | Employee and non-employee | RSUs and options                  
Share-based compensation                  
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 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%