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Summary of Significant Accounting Policies - Additional Information (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2023 CNY (¥) Customer Segment Unit ¥ / shares | Dec. 31, 2023 USD ($) Customer Segment Unit $ / shares | Dec. 31, 2022 CNY (¥) Segment Unit ¥ / shares | Dec. 31, 2021 CNY (¥) ¥ / shares | Dec. 31, 2023 USD ($) Customer | May 31, 2015 CNY (¥) | May 31, 2015 HKD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |
Exchange rate used for conversion of financial statements from RMB to US dollar | 7.0999 |  |  |  | 7.0999 |  |
Number of reportable segments | Segment | 2 | 2 | 2 |  |  |  |
Number of reporting units | Unit | 3 | 3 | 3 |  |  |  |
Allowance for contract asset | ¥ 168.0 |  | ¥ 285.0 |  | $ 24 |  |
Advertising, marketing and promotional expenses | ¥ 13,200.0 | $ 1,900 | 10,200.0 | ¥ 12,200.0 |  |  |
Number of customers with receivable balance exceeding 10% | Customer | 0 |  |  |  | 0 |  |
Number of customer or any Baidu Union partner with revenue greater than 10% | Customer | 0 | 0 |  |  |  |  |
Appreciation or depreciation of US$ against RMB, as a percentage | 2.94% | 2.94% |  |  |  |  |
Net (loss) income | ¥ 21,549.0 | $ 3,036 | 7,534.0 | 7,591.0 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 385.0 |  | 277.0 |  | $ 54 |  |
Cash and cash equivalents, restricted cash, debt investments and long-term restricted cash | 230,900.0 |  |  |  | 32,500 |  |
Revenue, Remaining Performance Obligation, Amount | ¥ 2,300.0 |  |  |  | 319 |  |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating Income (Loss) | Operating Income (Loss) |  |  |  |  |
Impairment of goodwill | ¥ 0.0 |  | 0.0 |  |  |  |
Income from government subsidies | 768.0 | $ 108 | 728.0 | ¥ 520.0 |  |  |
Deferred income government subsidies | ¥ 506.0 |  | ¥ 231.0 |  | 71 |  |
Common Class A and Class B [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Earnings per share - diluted | (per share) | ¥ 6.89 | $ 0.97 | ¥ 2.48 | ¥ 3.51 |  |  |
Earnings per share - basic | (per share) | ¥ 6.98 | $ 0.98 | ¥ 2.5 | ¥ 3.58 |  |  |
Maximum | State Administration of Taxation, China [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Deposit insurance system amount |  |  |  |  |  | ¥ 0.5 |
Maximum | Inland Revenue, Hong Kong [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Deposit insurance system amount | $ |  |  |  |  |  |  | $ 0.5
Short-term Investments [Member] | Maximum |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Maturity period used to classify short-term investments | 12 months | 12 months |  |  |  |  |
Cash and cash equivalents | Maximum |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalents | 3 months | 3 months |  |  |  |  |
Other Current Assets, net |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Contract assets | ¥ 3,300.0 |  | ¥ 3,400.0 |  | 459 |  |
Allowance for contract asset | 168.0 |  | 285.0 |  | 24 |  |
Deferred revenue |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Contract with Customer, Liability, Revenue Recognized | 5,900.0 | $ 832 |  |  |  |  |
Customer deposits and deferred​ revenue​ |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Contract liabilities | ¥ 7,900.0 |  | ¥ 6,800.0 |  | $ 1,100 |  |
Credit Concentration Risk | Onshore China | Financial Instruments |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Concentration risk by percentage | 82.00% | 82.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Institution One [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Concentration risk by percentage | 17.00% | 17.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Institution Two [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Concentration risk by percentage | 16.00% | 16.00% |  |  |  |  |
Credit Concentration Risk | Onshore China | Financial Institution Three [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Concentration risk by percentage | 13.00% | 13.00% |  |  |  |  |
Credit Concentration Risk | Offshore China | Financial Instruments |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Concentration risk by percentage | 18.00% | 18.00% |  |  |  |  |
Customer Concentration Risk | Sales Revenue, Net | Maximum |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Concentration risk by percentage | 10.00% | 10.00% |  |  |  |  |
Office building and its related facility |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, salvage value, percentage | 4.00% |  |  |  | 4.00% |  |
Change In Accounting Estimate [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Depreciation expense |  |  |  | ¥ 982.0 |  |  |
Net (loss) income |  |  |  | ¥ 814.0 |  |  |
Change In Accounting Estimate [Member] | Common Class A and Class B [Member] |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Earnings per share - diluted | ¥ / shares |  |  |  | ¥ 0.28 |  |  |
Earnings per share - basic | ¥ / shares |  |  |  | ¥ 0.28 |  |  |

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