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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Jan. 01, 2018 CNY (¥) | Dec. 31, 2017 USD ($) Customer Segment | Dec. 31, 2016 CNY (¥) Customer Unit | Dec. 31, 2017 USD ($) Customer Unit | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2017 CNY (¥) Customer | Dec. 31, 2016 CNY (¥) Customer | Dec. 31, 2015 CNY (¥) Customer | Dec. 31, 2017 CNY (¥) Customer
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |  |  |  |  |  |
Internal use software development costs capitalized during the period |  |  |  |  |  | $ 0 | ¥ 0 | ¥ 4,000,000 | ¥ 33,000,000 |
Amortization expense for capitalized software costs |  |  |  |  |  | 1 | 8,000,000 | 7,000,000 | 13,000,000 |
Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net) |  |  | $ 3 | ¥ 30,000,000 | $ 3 | 3 |  | 30,000,000 |  | ¥ 22,000,000
Number of reporting units | Unit |  |  |  | 3 | 2 |  |  |  |  |
Gross interest income |  |  |  |  |  | 543 | 3,500,000,000 |  |  |
Gross interest cost |  |  |  |  |  | 288 | 1,900,000,000 |  |  |
Barter transaction, Gross Operating Revenue Recognized |  |  |  |  |  | 117 | 763,000,000 | 382,000,000 | 350,000,000 |
Sale tax and surcharges in cost of revenues |  |  |  |  |  | 951 | 6,200,000,000 | 4,700,000,000 | 4,600,000,000 |
Advertising and promotional expenses |  |  |  |  |  | 700 | ¥ 4,600,000,000 | ¥ 7,700,000,000 | ¥ 9,800,000,000 |
Cash and cash equivalents, restricted cash and short-term investments |  |  | $ 15,500 |  | $ 15,500 | $ 15,500 |  |  |  | ¥ 100,700,000,000
Number of customers with receivable balance exceeding 10 % |  |  | 0 | 0 | 0 | 0 |  | 0 |  | 0
Number of customer or any Baidu Union member with revenue greater than 10% |  |  |  |  |  | 0 | 0 | 0 | 0 |
Depreciation of US$ against RMB, as a percentage |  |  |  |  |  | 6.29% | 6.29% |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Percentage of change in revenue |  |  |  |  |  | 5.60% | 5.60% |  |  |
Accounting Standards Update 2016-01 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Cumulative effect of initially application of guidance on retained earnings | $ 104 | ¥ 676,000,000 |  |  |  |  |  |  |  |
Online Payment Agencies |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts of online payment agencies | ¥ |  |  |  | ¥ 0 |  |  |  | ¥ 0 |  | ¥ 0
Micro loans | Maximum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Periods of loan granted |  |  |  |  |  | 36 months | 36 months |  |  |
Micro loans | Minimum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Periods of loan granted |  |  |  |  |  | 1 month | 1 month |  |  |
Cash and cash equivalents | Maximum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  |  |  |  | 3 months | 3 months |  |  |
Short-term Investments | Maximum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  |  |  |  | 12 months | 12 months |  |  |
Short-term Investments | Minimum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  |  |  |  | 3 months | 3 months |  |  |
Credit Concentration Risk | Sales Revenue, Net | Maximum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  |  |  |  | 10.00% | 10.00% |  |  |
Onshore China | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 95.95% |  |  |  |  |  |  |
Offshore China | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 4.05% |  |  |  |  |  |  |
Bank of China | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 25.26% |  |  |  |  |  |  |
China Construction Bank [Member] | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 18.83% |  |  |  |  |  |  |
China Merchants Bank | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 12.56% |  |  |  |  |  |  |
Bank of Communications | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 10.50% |  |  |  |  |  |  |
iQIYI Licensed Copyright |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Barter transaction, Gross Operating Revenue Recognized |  |  |  |  |  | $ 117 | ¥ 763,000,000 | 382,000,000 | ¥ 350,000,000 |
Barter transaction, Cost Recognized |  |  |  |  |  | $ 100 | ¥ 650,000,000 | ¥ 363,000,000 | ¥ 265,000,000 |
Office building related facility, machinery and equipment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, salvage value, percentage |  |  | 4.00% |  | 4.00% | 4.00% |  |  |  | 4.00%

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