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Convertible bonds (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Convertible bonds, non-current      
Convertible bonds $ 719,436 ¥ 5,008,600 ¥ 0
Notes due 2025      
Convertible bonds, non-current      
Convertible bonds   2,646,642 0
Notes due 2026      
Convertible bonds, non-current      
Convertible bonds   2,361,929 0
Short-term Debt [Member]      
Convertible bonds, current      
Convertible bonds, current   0 6,863
Long-term Debt [Member]      
Convertible bonds, non-current      
Convertible bonds   ¥ 5,008,571 ¥ 0