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Subsequent events (Details)
$ / shares in Units, ¥ in Millions, $ in Millions
1 Months Ended 4 Months Ended 12 Months Ended 37 Months Ended
Mar. 08, 2023
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
Feb. 28, 2023
CNY (¥)
Apr. 20, 2023
USD ($)
shares
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Apr. 20, 2023
USD ($)
shares
Subsequent events                
Shares repurchased during the year | ¥         ¥ 1,823 ¥ 5,246 ¥ 312  
Subsequent event                
Subsequent events                
Cash dividend, per ordinary share | $ / shares $ 0.31              
Dividends Payable $ 1,000              
Dividends Payable, expected payment date Apr. 27, 2023              
Subsequent event | SHANGHAI STOCK EXCHANGE [Member]                
Subsequent events                
Proceeds from REITS listed on the shanghai stock exchange | ¥     ¥ 1,700          
Subsequent event | Series B Preferred Stock [Member]                
Subsequent events                
Preference shares financing   $ 210            
Subsequent event | American Depositary Share [Member]                
Subsequent events                
Shares repurchased during the year (in ADS shares) | shares       3,839,490       20,255,890
Shares repurchased during the year       $ 153       $ 1,290
Cash dividend, per ordinary share | $ / shares $ 0.62              
Dividends Payable, expected payment date May 04, 2023