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Investments - Long-term Investments - Additional information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
USD ($)
Aug. 31, 2018
CNY (¥)
Jul. 31, 2018
USD ($)
Jul. 31, 2018
CNY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Schedule of Investments [Line Items]                        
Carrying amount of cost method investments                       ¥ 21,800,000,000
Carrying amount of equity investments without readily determinable fair value         $ 4,000,000,000     $ 4,000,000,000     ¥ 27,600,000,000  
Accumulated impairment of equity investments without readily determinable fair value         175,000,000     175,000,000     1,200,000,000  
Equity investments measured at fair value         609,000,000     609,000,000     4,200,000,000  
Unrealized gains and losses recognized         143,000,000 ¥ 981,000,000   609,000,000 ¥ 4,200,000,000      
Impairment charges recognized on equity investments without readily determinable fair value         43,000,000 298,000,000   51,000,000 348,000,000      
Carrying amount of equity method investments         6,500,000,000     6,500,000,000     ¥ 44,700,000,000 ¥ 31,400,000,000
Impairment recognized for equity method investments         $ 0 ¥ 0 ¥ 0 $ 7,000,000 ¥ 48,000,000 ¥ 0    
Du Xiaoman Financial                        
Schedule of Investments [Line Items]                        
Deconsolidation, disposal gain $ 874,000,000 ¥ 6,000,000,000                    
Equity interest percentage 41.00% 41.00%                    
Global Ad and Tools Business                        
Schedule of Investments [Line Items]                        
Disposal gain recognized     $ 130,000,000 ¥ 893,000,000