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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
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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

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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