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Fixed Assets (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 4,012 ¥ 26,104 ¥ 21,874
Accumulated depreciation and impairment (2,095) (13,629) (10,580)
Fixed assets, net 1,917 12,475 11,294
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 2,821 18,354 15,193
Office building      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 615 4,003 3,247
Office building related facility, machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 301 1,956 1,772
Vehicles      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 12 80 45
Office equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 106 690 546
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 52 341 316
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 105 ¥ 680 ¥ 755