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Net loss per share (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2015
CNY (¥)
item
¥ / shares
shares
Dec. 31, 2014
CNY (¥)
¥ / shares
shares
Dec. 31, 2013
CNY (¥)
¥ / shares
shares
Numerator:        
Net loss $ (1,447,715) ¥ (9,378,016) ¥ (4,996,358) ¥ (49,899)
Series C Preferred Shares redemption value accretion | ¥     (7,957,640) (2,435,366)
Net loss attributable to ordinary shareholders (1,447,715) (9,378,016) (12,953,998) (2,485,265)
Numerator for basic net loss per share $ (1,447,715) (9,378,016) (12,953,998) (2,485,265)
Numerator for diluted net loss per share | ¥   ¥ (9,378,016) ¥ (12,953,998) ¥ (2,485,265)
Denominator:        
Weighted average number of shares - basic | shares 2,735,034,034 2,735,034,034 2,419,668,247 1,694,495,048
Weighted average number of shares - diluted | shares 2,735,034,034 2,735,034,034 2,419,668,247 1,694,495,048
Basic net loss per share attributable to ordinary shareholders | (per share) $ (0.53) ¥ (3.43) ¥ (5.35) ¥ (1.47)
Diluted net loss per share attributable to ordinary shareholders | (per share) $ (0.53) ¥ (3.43) ¥ (5.35) ¥ (1.47)
Number of different classes of shares presented | item 3 3