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Income Taxes - Additional Information (Detail) ¥ in Billions, $ in Billions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 | Sep. 30, 2018 CNY (¥)
Income Taxes [Line Items] |  |  |  |  |
Unified statutory income tax rate under current EIT law |  |  | 25.00% |  |
Effective tax rate | 15.00% | 12.00% | 16.00% | 13.00% |
Undistributed earnings no withholding tax has accrued | $ 19.9 |  | $ 19.9 |  | ¥ 136.9
PRC statutory withholding tax rate to which dividends paid by a FIE to any of its foreign non-resident enterprise investors |  |  | 10.00% |  |
PRC special withholding tax rate to which dividends paid by a FIE to its foreign non-resident enterprise investors in Hong Kong |  |  | 5.00% |  |
Baidu HK |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax rate |  |  | 16.50% |  |

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- Definition Percentage of statutory corporate income tax rate applicable to pretax income (loss). + References No definition available. + Details
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- Definition Income Taxes [Line Items] + References No definition available. + Details
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- Definition The special withholding tax rate to which dividends paid by a foreign-invested enterprise onshore in China to any of its Hong Kong non-resident enterprise investors offshore are subject. These Hong Kong investors must meet the requirements stipulated by China's tax regulations. + References No definition available. + Details
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- Definition The statutory withholding tax rate to which dividends paid by a foreign-invested enterprise onshore China to any of its foreign non-resident enterprise investors offshore are subject. + References No definition available. + Details
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- Definition Statutory enterprise income tax rate under current PRC's Enterprise Income Tax Law. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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