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Reconciliation of Net Income to Numerator for Computation of Basic and Diluted Per Share (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |
Net income attributable to Baidu, Inc. | ¥ 2,057 | $ 296 | ¥ 27,573 | ¥ 18,301
Accretion of the redeemable noncontrolling interests | (77) | (11) | (130) | 17
Numerator for basic EPS computation | 1,980 | 285 | 27,443 | 18,318
Impact of subsidiaries' and investees' diluted earnings per share | (28) | (4) |  |
Numerator for diluted EPS calculation | ¥ 1,952 | $ 281 | ¥ 27,443 | ¥ 18,318

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