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Unsecured senior notes (Tables)
9 Months Ended
Sep. 30, 2019
Unsecured senior notes  
Schedule of unsecured senior notes
                         
 
 
   
Effective
interest rate
 
 
As of
   
 
December 31,
2018
 
 
September 30,
2019
 
 
 
RMB
 
 
RMB
 
 
 
US$
500,000
3.125
% notes due 2021
   
3,413,264
     
3,523,467
     
3.37
%
US$
500,000
3.875
% notes due 2026
   
3,372,879
     
3,480,997
     
4.15
%
 
 
 
 
 
 
 
 
 
 
 
 
 
Carrying value
   
6,786,143
     
7,004,464
     
 
Unamortized discount and debt issuance costs
   
77,057
     
68,436
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total principal amounts of unsecured senior notes
   
6,863,200
     
7,072,900