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Business acquisition - Details of allocation of the purchase price as of the date of acquisition is summarized as follows (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Mar. 01, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Details of allocation of the purchase price as of the date of acquisition is summarized as follows [Line Items]          
Goodwill ¥ 23,123 $ 3,353   ¥ 12,433 ¥ 10,904
CNLP [Member]          
Details of allocation of the purchase price as of the date of acquisition is summarized as follows [Line Items]          
Net assets acquired     ¥ 4,309    
Appreciation of property, equipment and software, construction in progress and land-use rights     10,908    
Goodwill     1,586    
Deferred tax liabilities     (2,679)    
Non-controlling interests     (2,293)    
Total     ¥ 11,831