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Lines of credit and loan facilities (Details)
Dec. 31, 2017
CNY (¥)
Lines of credit and loan facilities  
Outstanding for the liquidity loans ¥ 0
Amount reserved for the issuance of bank acceptance 18,762,657,000
Amount reserved for bank guarantee 605,713,000
Amount outstanding for other facilities 2,631,000
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Maximum borrowing capacity under facility ¥ 39,924,280,000