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Lines of credit and loan facilities (Details 2)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
CNY (¥)
Lines of credit and loan facilities          
Proceeds from long-term borrowings | ¥       ¥ 2,890,575  
LIBOR          
Lines of credit and loan facilities          
Percentage over variable rate basis   1.15%      
Term and Revolving Credit Facilities          
Lines of credit and loan facilities          
Term (in years)   5 years      
Maximum borrowing capacity under facilities   $ 1,000,000      
Number of arrangers | item   24      
Undrawn balance which will be expired one month prior to the final maturity date     $ 550,000    
Commitment fee (as a percentage)     0.20%    
Proceeds from long-term borrowings $ 450,000        
Unsecured revolving lines of credit          
Lines of credit and loan facilities          
Maximum borrowing capacity under facilities | ¥         ¥ 75,337,037
Debt payable more than two years but not exceeding five years     $ 450,000