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Income Taxes - Additional Information (Detail) ¥ in Millions, $ in Millions | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2013 CNY (¥)
Income Taxes [Line Items] |  |  |  |  |  |  |
Unified statutory income tax rate under current EIT law | 25.00% |  |  |  |  |  |
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% |  |  |  |  |  |
Statutory withholding tax rate for capital gains | 10.00% |  |  |  |  |  |
Net losses deriving from entities in the PRC, Hong Kong and Japan | $ 1,200 |  |  |  | $ 1,200 | ¥ 7,800 |
Accrued withholding tax | 91 | ¥ 633 |  |  | 91 | 586 | ¥ 581
Undistributed earnings no withholding tax has accrued | $ 17,400 |  |  |  | $ 17,400 | ¥ 113,100 |
High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate | 15.00% |  |  |  |  |  |
Preferential enterprise income tax rate, effective period | 3 years |  |  |  |  |  |
Key Software Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate | 10.00% |  |  |  |  |  |
PRC |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforward period | 5 years |  |  |  |  |  |
Net operating loss carryforwards begins to expire | 2018 |  |  |  |  |  |
PRC | Maximum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Time period that tax authorities could conduct examinations of entity's tax filings | 5 years |  |  |  |  |  |
PRC | Earliest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax years remain open to examination by respective taxing jurisdictions | 2013 |  |  |  |  |  |
PRC | Latest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax years remain open to examination by respective taxing jurisdictions | 2017 |  |  |  |  |  |
Japan |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforward period | 9 years |  |  |  |  |  |
Net operating loss carryforwards begins to expire | 2018 |  |  |  |  |  |
Baidu HK |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax rate | 16.50% |  |  |  |  |  |
Baidu Japan |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax rate | 31.70% | 33.50% | 35.60% | 38.00% |  |  |
Baidu Online | Key Software Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  | 10.00% | 10.00% |  |  |  |
Baidu China | Key Software Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  | 10.00% | 10.00% |  |  |  |
Baidu International | Key Software Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  | 10.00% |  |  |  |  |
Certain PRC Subsidiaries and VIEs | High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  |  |  | 15.00% |  |
Certain PRC Subsidiaries and VIEs | High And New Technology Enterprise | Expiration Period One |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax holiday, expiration year | 2018 |  |  |  |  |  |
Certain PRC Subsidiaries and VIEs | High And New Technology Enterprise | Expiration Period Two |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax holiday, expiration year | 2019 |  |  |  |  |  |
Certain PRC Subsidiaries and VIEs | High And New Technology Enterprise | Expiration Period Three |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax holiday, expiration year | 2020 |  |  |  |  |  |

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