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Business acquisition - Summary of purchase price as of the date of CNLP acquisition (Details) - CNLP [Member]
¥ in Millions, $ in Millions
5 Months Ended
Mar. 01, 2022
CNY (¥)
Mar. 01, 2022
HKD ($)
Jul. 31, 2022
CNY (¥)
Jul. 31, 2022
HKD ($)
Summary of purchase price as of the date of acquisition is comprised [Line Items]        
Cash ¥ 10,538 $ 13,066    
Fair value of previously held equity interests 1,293      
Total ¥ 11,831   ¥ 2,637 $ 3,072