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Reconciliation of Net Income to Numerator for Computation of Basic and Diluted Net Income per Share (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]        
Net income attributable to Baidu, Inc. $ 2,812 ¥ 18,301 ¥ 11,632 ¥ 33,664
Accretion of redeemable noncontrolling interests 3 17 (557) (329)
Numerator for EPS computation $ 2,815 ¥ 18,318 ¥ 11,075 ¥ 33,335