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Convertible Preferences Shares (Details) - 12 months ended Dec. 31, 2012 - Convertible Preference Shares
$ / shares in Units, ¥ in Millions, $ in Billions
USD ($)
$ / shares
CNY (¥)
CNY (¥)
Convertible Preferences Shares      
Initial conversion price (in dollars per share) | $ / shares $ 18.50    
Prior to the second anniversary of the issuance date      
Convertible Preferences Shares      
Dividend rate per annum   2.00%  
Second anniversary of the issuance date until the mandatory redemption date      
Convertible Preferences Shares      
Dividend rate per annum   5.00%  
After the mandatory redemption date      
Convertible Preferences Shares      
Dividend rate per annum   8.00%  
Yahoo      
Convertible Preferences Shares      
Liquidation preference $ 1.7   ¥ 10,700
Issuance cost | ¥   ¥ 157