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Significant unobservable inputs used in fair value measurement of liabilities (Details)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivatives [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]    
Interest rate, significant unobservable inputs, liabilities 0.03% ~ 4.16% 0.02% ~ 4.16%
Borrowings and debt securities [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]    
Interest rate, significant unobservable inputs, liabilities 0.08% ~ 4.38% 0.02% ~ 4.38%
Finance lease [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]    
Interest rate, significant unobservable inputs, liabilities 9.00% ~ 10.83% 9.00% ~ 10.83%