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Business acquisition (Details 2) - CNLP [Member]
¥ in Millions, $ in Millions
5 Months Ended
Mar. 01, 2022
CNY (¥)
Mar. 01, 2022
HKD ($)
Jul. 31, 2022
CNY (¥)
Jul. 31, 2022
HKD ($)
Jan. 28, 2022
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 80.00%       26.38%
Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination 10.60%        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt ¥ 8,886        
Business Combination Recognized Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment Construction In Progress And Land Use Right 12,026        
Cash consideration 10,538 $ 13,066      
Business Combination, Consideration Transferred ¥ 11,831   ¥ 2,637 $ 3,072