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Fair value measurement (Details)
¥ in Millions, $ in Millions
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Assets      
Marketable securities and other investments ¥ 80,840 $ 11,386 ¥ 14,360
Investment, Type [Extensible Enumeration] Wealth management products Wealth management products Wealth management products
Recurring basis      
Assets      
Restricted cash ¥ 7,506   ¥ 6,254
Total assets 69,926   92,010
Recurring basis | Wealth management products      
Assets      
Short-term investments 56,847   71,496
Marketable securities and other investments 2,808   2,649
Recurring basis | Listed equity securities      
Assets      
Marketable securities and other investments 2,765   11,611
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets      
Total assets 2,765   11,611
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities      
Assets      
Marketable securities and other investments 2,765   11,611
Recurring basis | Significant Other Observable Inputs (Level 2)      
Assets      
Restricted cash 7,506   6,254
Total assets 67,161   80,399
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products      
Assets      
Short-term investments 56,847   71,496
Marketable securities and other investments ¥ 2,808   ¥ 2,649