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Land use rights, net (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Land Use Rights, Net [Line Items]              
Land use rights ¥ 15,253   ¥ 11,787        
Less: accumulated amortization (925)   (662)        
Net book value 14,328   11,125       $ 2,248
Amortization expenses 276   ¥ 229   ¥ 222    
Amortization expenses related to the land use rights for future periods              
2022 319            
2023 319            
2024 319            
2025 319            
2026 319            
2027 and thereafter ¥ 12,733            
Impairment charge | $   $ 0   $ 0   $ 0