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Share repurchase program (Details)
$ / shares in Units, ¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2022
CNY (¥)
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Nov. 30, 2021
USD ($)
Shares repurchased during the year | ¥   ¥ 1,823   ¥ 5,246   ¥ 312    
ADS | 2020 Share repurchase program                
Authorized amount $ 2,000              
Repurchase period (in months) 24 months              
Shares repurchased during the year (in ADS shares) | shares   5,010,203 5,010,203 10,214,827 10,214,827 1,191,370 1,191,370  
Shares repurchased during the year   ¥ 1,823 $ 286 ¥ 5,246 $ 806 ¥ 312 $ 44  
Weighted average repurchase price (in dollars per ADS) | $ / shares     $ 57.14   $ 78.92   $ 37.04  
Share Repurchase Authorization         $ 3,000     $ 2,000