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Share-based Compensation (Effects of changes to forfeiture rate) (Details) - 12 months ended Dec. 31, 2016
¥ in Millions, $ in Millions
CNY (¥)
USD ($)
Change in forfeiture rate [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation reduced ¥ 27.6 $ 4.1