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Fair value measurement (Details)
¥ in Millions, $ in Millions
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Assets      
Marketable securities and other investments ¥ 59,370 $ 8,134 ¥ 80,840
Investment, Type [Extensible Enumeration] Wealth management products Wealth management products Wealth management products
Recurring basis      
Assets      
Restricted cash ¥ 7,366   ¥ 7,506
Total assets 48,669   69,926
Recurring basis | Wealth management products      
Assets      
Short-term investments 38,396   56,847
Marketable securities and other investments     2,808
Recurring basis | Listed equity securities      
Assets      
Marketable securities and other investments 2,907   2,765
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets      
Total assets 2,907   2,765
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities      
Assets      
Marketable securities and other investments 2,907   2,765
Recurring basis | Significant Other Observable Inputs (Level 2)      
Assets      
Restricted cash 7,366   7,506
Total assets 45,762   67,161
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products      
Assets      
Short-term investments ¥ 38,396   56,847
Marketable securities and other investments     ¥ 2,808