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Fixed Assets (Detail)
¥ in Millions, $ in Millions
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 4,632 ¥ 31,811 ¥ 26,104
Accumulated depreciation (2,274) (15,614) (13,629)
Fixed assets, net 2,358 16,197 12,475
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 3,427 23,539 18,354
Office building      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 606 4,163 4,003
Office building related facility, machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 315 2,166 1,956
Vehicles      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 24 162 80
Office equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 109 747 690
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 50 341 341
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 101 ¥ 693 ¥ 680