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Summary of Significant Accounting Policies - Additional Information (Detail) ¥ in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2018 CNY (¥) | Dec. 31, 2019 CNY (¥) Customer Unit Segment | Dec. 31, 2019 USD ($) Customer Unit Segment | Dec. 31, 2018 CNY (¥) Customer Unit Segment | Dec. 31, 2017 CNY (¥) Customer | Dec. 31, 2019 USD ($) Customer | Jan. 01, 2019 CNY (¥) | Jan. 01, 2019 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  | 2 | 2 | 2 |  |  |  |
Property, plant and equipment, salvage value, percentage |  | 4.00% |  |  |  | 4.00% |  |
Number of reporting units | Unit |  | 2 | 2 | 2 |  |  |  |
Retained earnings |  | ¥ 126,268 |  | ¥ 129,246 |  | $ 18,137 |  |
VAT recognized |  | 6,400 | $ 925 | 6,100 | ¥ 4,800 |  |  |
Acquisition of licensed copyrights from nonmonetary content exchanges |  | 683 | 98 | 1,083 | 763 |  |  |
Gross interest income |  |  |  | 3,300 | 3,500 |  |  |
Gross interest cost |  |  |  | 1,600 | 1,900 |  |  |
Advertising and promotional expenses |  | 10,500 | $ 1,500 | 10,100 | ¥ 4,600 |  |  |
Right of Use Assets |  | 7,332 |  | ¥ 0 |  | 1,053 |  |
Total Lease Liabilities |  | 6,769 |  |  |  | 972 |  |
Cash and cash equivalents, restricted cash and short-term investments |  | ¥ 147,400 |  |  |  | $ 21,200 |  |
Number of customers with receivable balance exceeding 10% | Customer |  | 0 |  | 0 |  | 0 |  |
Number of customer or any Baidu Union partner with revenue greater than 10% | Customer |  | 0 | 0 | 0 | 0 |  |  |
Appreciation of US$ against RMB, as a percentage |  | 1.26% | 1.26% |  |  |  |  |
Operating lease liabilities, Current |  | ¥ 2,283 |  | ¥ 0 |  | $ 328 |  |
Licensed copyrights |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Impairment charges recognized |  | 0 |  | 181 | ¥ 390 |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Retained earnings | ¥ 933 |  |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Right of Use Assets |  | 7,300 |  |  |  | 1,100 | ¥ 5,400 | $ 782
Total Lease Liabilities |  | 6,800 |  |  |  | 972 | 5,000 | $ 716
Operating lease liabilities, Current |  | 2,300 |  |  |  | 328 |  |
Online Payment Agencies |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Allowance for doubtful accounts of online payment agencies |  | 0 |  | 0 |  |  |  |
iQIYI Licensed Copyright |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Acquisition of licensed copyrights from nonmonetary content exchanges |  | 683 | $ 98 | 1,100 | 763 |  |  |
Barter transaction, Cost Recognized |  | ¥ 570 | $ 82 | 1,000 | ¥ 650 |  |  |
Short-term Investments | Minimum |  |  |  |  |  |  |  |
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 |  |  |  |  |
Cash and cash equivalents | Maximum |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  | 3 months | 3 months |  |  |  |  |
Other Current Assets, net |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Contract assets |  | ¥ 1,900 |  | 1,400 |  | 269 |  |
Allowance for doubtful accounts receivable |  | 7 |  | ¥ 21 |  | $ 1 |  |
Contract with Customer, Liability, Revenue Recognized |  | ¥ 3,100 | $ 444 |  |  |  |  |
Credit Concentration Risk | Sales Revenue, Net | Minimum |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Concentration risk by percentage |  | 10.00% | 10.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Instruments |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Concentration risk by percentage |  | 92.00% | 92.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Institution One [Member] |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Concentration risk by percentage |  | 24.00% | 24.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Institution Two [Member] |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Concentration risk by percentage |  | 21.00% | 21.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Institution Three [Member] |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Concentration risk by percentage |  | 18.00% | 18.00% |  |  |  |  |
Credit Concentration Risk | Offshore China | Financial Instruments |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Concentration risk by percentage |  | 8.00% | 8.00% |  |  |  |  |
Ordinary Shares | Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Cumulative effect on retained earnings | ¥ 1,900 |  |  |  |  |  |  |
Office building and its related facility |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Property, plant and equipment, salvage value, percentage |  | 4.00% |  |  |  | 4.00% |  |
Land use right | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  | ¥ 265 |

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