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Reconciliation of Net Income to Numerator for Computation of Basic and Diluted Earnings Per Share (Detail)
¥ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]            
Net income attributable to Baidu, Inc. $ 1,805 ¥ 12,396 ¥ 7,949 $ 3,711 ¥ 25,492 ¥ 14,141
Accretion of the redeemable noncontrolling interests 0 0 466 (19) (128) (173)
Net income available to ordinary shareholders $ 1,805 ¥ 12,396 ¥ 8,415 $ 3,692 ¥ 25,364 ¥ 13,968