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Income Taxes - Additional Information (Detail)
¥ in Billions, $ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
Sep. 30, 2018
USD ($)
Sep. 30, 2017
Sep. 30, 2018
CNY (¥)
Income Taxes [Line Items]          
Unified statutory income tax rate under current EIT law     25.00%    
Effective tax rate 15.00% 12.00% 16.00% 13.00%  
Undistributed earnings no withholding tax has accrued $ 19.9   $ 19.9   ¥ 136.9
PRC statutory withholding tax rate to which dividends paid by a FIE to any of its foreign non-resident enterprise investors     10.00%    
PRC special withholding tax rate to which dividends paid by a FIE to its foreign non-resident enterprise investors in Hong Kong     5.00%    
Baidu HK          
Income Taxes [Line Items]          
Income tax rate     16.50%