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Business Combination - Additional Information (Detail)
¥ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Business Acquisition [Line Items]          
Business acquisition, total purchase consideration $ 353 ¥ 2,400 ¥ 721    
Business acquisition, goodwill 2,483     ¥ 17,051 ¥ 15,806
Business acquisition, intangible assets 139     958  
Business acquisition, net assets other than goodwill and intangible assets 73     491  
Business acquisition, attribute to noncontrolling interest 130     889  
Cash paid for business combination 192 ¥ 1,300      
Series of Individually Immaterial Business Acquisitions          
Business Acquisition [Line Items]          
Business acquisition, goodwill $ 271     ¥ 1,900