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Significant unobservable inputs used in fair value measurement of liabilities (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivatives    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]    
Interest rate, significant unobservable inputs, liabilities (-) 0.73% ~ 3.08% 0.01% ~ 4.16%
Borrowings and debt securities    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]    
Interest rate, significant unobservable inputs, liabilities (-) 0.53% ~ 4.38% 0.17% ~ 3.90%
Finance lease    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]    
Interest rate, significant unobservable inputs, liabilities 0.57% ~ 16.60% 1.38% ~ 10.83%