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Share-based compensation (Details 2)
$ / shares in Units, ¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
$ / shares
shares
Dec. 31, 2022
CNY (¥)
shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Additional disclosures                
Share-based compensation expenses | ¥ ¥ 4,804   ¥ 7,548   ¥ 9,134      
Share Incentive Plan | Employee and non-employee | RSU | Service-based                
Number of Shares                
Unvested at the beginning of the year (in shares) 71,641,054   95,108,866   108,269,242      
Granted (in shares) 16,682,380   13,951,100   30,069,498      
Vested (in shares) (19,416,652)   (23,123,292)   (23,834,466)      
Forfeited or cancelled (14,918,722)   (14,295,620)   (19,395,408)      
Unvested at the end of the year (in shares) 53,988,060   71,641,054   95,108,866   108,269,242  
Weighted-Average Grant-Date Fair Value                
Unvested at the beginning of the year (in dollars per share) | $ / shares   $ 27.56   $ 25.89   $ 19.62    
Granted (in dollars per share) | $ / shares   18.24   29.81   39.93    
Vested (in dollars per share) | $ / shares   24.83   23.04   18.89    
Forfeited or cancelled | $ / shares   28.48   25.94   21.3    
Unvested at the end of the year (in dollars per share) | $ / shares   $ 25.4   27.56   25.89 $ 19.62  
Additional disclosures                
Share-based compensation expenses | ¥ ¥ 1,840   ¥ 3,877   ¥ 4,129      
Unrecognized share-based compensation expense related to awards other than options | ¥ ¥ 3,765 $ 3,765            
Weighted-average period over which share-based compensation expense is expected to be recognized 3 years 3 months 18 days              
Total fair value of RSUs vested | ¥ ¥ 2,930   4,590   6,359      
Total intrinsic value of RSUs vested | ¥ ¥ 2,930   ¥ 4,590   ¥ 6,359      
Share Incentive Plan | Employee and non-employee | Options | Service-based                
Number of share options                
Outstanding at the beginning of the year (in shares) 2,314,136   2,937,112   4,907,060      
Granted (in shares) 0   0   0      
Exercised (in shares) (1,485,726)   (620,476)   (1,962,856)      
Forfeited or cancelled (24,590)   (2,500)   (7,092)      
Outstanding at the end of the year (in shares) 803,820   2,314,136   2,937,112   4,907,060  
Vested and expected to vest at the end of the year (in shares) 799,483 799,483           799,483
Exercisable at the end of the year (in shares) 787,140 787,140           787,140
Weighted Average Exercise Price                
Outstanding at the beginning of the year (in dollars per share) | $ / shares   $ 7.29   6.95   6.38    
Exercised (in dollars per share) | $ / shares   4.44   5.7   5.49    
Forfeited or cancelled (in dollars per share) | $ / shares   11.65   3.96   13.42    
Outstanding at the end of the year (in dollars per share) | $ / shares   $ 12.43   $ 7.29   $ 6.95 $ 6.38  
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares               $ 12.43
Exercisable at the end of the year (in dollars per share) | $ / shares               $ 12.42
Weighted Average Remaining Contractual Term (years)                
Outstanding at the end of the year 3 years 8 months 12 days   2 years 2 months 12 days   2 years 10 months 24 days   3 years  
Vested and expected to vest at the end of the year 3 years 8 months 12 days              
Exercisable at the end of the year 3 years 7 months 6 days              
Aggregate Intrinsic Value                
Outstanding at the end of the year (in dollars) | $       $ 48   $ 82 $ 184 $ 2
Vested and expected to vest at the end of the year (in dollars) | $               2
Exercisable at the end of the year (in dollars) | $               $ 2
Additional disclosures                
Weighted-average period over which share-based compensation expense is expected to be recognized 9 months 18 days              
Total intrinsic value of options exercised | ¥ ¥ 98   ¥ 98   ¥ 453      
Share Incentive Plan | Non-employees | RSU | Service-based                
Number of Shares                
Unvested at the beginning of the year (in shares) 5,526,834              
Unvested at the end of the year (in shares) 2,838,656   5,526,834          
Share Incentive Plan | Non-employees | Options | Service-based                
Number of share options                
Outstanding at the beginning of the year (in shares) 78,706              
Outstanding at the end of the year (in shares) 57,206   78,706          
Share Incentive Plan | Year two | Employee and non-employee | RSUs and options                
Share-based compensation                
Vesting schedule 2 years              
Share Incentive Plan | Year ten | Employee and non-employee | RSUs and options                
Share-based compensation                
Vesting schedule 6 years