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Summary of Significant Accounting Policies - Restricted cash (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Restricted cash        
Restricted cash $ 2,382,280 ¥ 16,379,364 ¥ 9,370,849  
ASU 2016-18 | Proforma Adjustment        
Restricted cash        
Restricted cash     ¥ 9,370,849 ¥ 0