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Land use right - Summary of Quantitative Information About Land Use Right (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Quantitative Information About Land Use Right [Line Items]      
Biginning balance ¥ 2,480    
Additions 470 ¥ 426  
Amortization charge (781) (924) ¥ (779)
Ending balance 2,437 2,480  
Land [Member]      
Disclosure Of Quantitative Information About Land Use Right [Line Items]      
Biginning balance 2,480 1,495  
Additions 32 1,052  
Amortization charge (75) (67)  
Ending balance ¥ 2,437 ¥ 2,480 ¥ 1,495