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Financing receivables, net (Allowance For Financing Receivables) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable, net    
Balance at the beginning of the year ¥ (15,829)  
Charge for the year (170,941) ¥ (15,829)
Balance at the end of the year ¥ (186,770) ¥ (15,829)