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Lines of credit (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
item
Lines of credit  
Number of PRC commercial banks with whom entity had agreements | item 21
Outstanding for the liquidity loans ¥ 2,000,000
Amount reserved for the issuances of bank acceptance 8,841,710
Amount reserved for bank guarantee 187,662
Amount outstanding for the bank factoring 826,973
Revolving lines of credit  
Lines of credit  
Maximum borrowing capacity under facility ¥ 21,660,000