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Lines of credit (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2015
CNY (¥)
item
Lines of credit  
Number of PRC commercial banks with whom entity had agreements | item 18
Outstanding borrowings ¥ 3,040,209
Amount reserved for the issuances of bank acceptance 5,510,796
Amount reserved for bank guarantee 82,056
Amount outstanding for the bank factoring 180,000
Revolving lines of credit  
Lines of credit  
Maximum borrowing capacity under facility ¥ 14,092,000