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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
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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

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