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Fair value measurement (Details)
¥ in Millions, $ in Millions
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Assets      
Investment securities ¥ 11,611 $ 1,683 ¥ 19,088
Recurring basis      
Assets      
Restricted cash 6,254   5,926
Total assets 92,010   102,024
Recurring basis | Wealth management products      
Assets      
Short-term investments 71,496   77,010
Other non-current assets 2,649    
Recurring basis | Listed equity securities      
Assets      
Investment securities 11,611   19,088
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets      
Total assets 11,611   19,088
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities      
Assets      
Investment securities 11,611   19,088
Recurring basis | Significant Other Observable Inputs (Level 2)      
Assets      
Restricted cash 6,254   5,926
Total assets 80,399   82,936
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products      
Assets      
Short-term investments 71,496   ¥ 77,010
Other non-current assets ¥ 2,649