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Cash and cash equivalents, restricted cash, short term investments, long term time deposits and held to maturity investments.

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Deposit insurance system amount.

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Maturity period used to classify short-term investments.

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Net value of contract assets.

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Number Of Customer Accounting For More Than Ten Percent Of Accounts Receivable

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of increase (decrease) in income from government assistance.

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Amount of decrease in asset from government assistance.

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Indicates line item in statement of financial position that includes decrease in asset from government assistance.

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Indicates line item in statement of income or comprehensive income that includes increase (decrease) in income from government assistance.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The total expense recognized in the period for promotion, public relations, and brand or product advertising.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

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Summary of Significant Accounting Policies - Additional Information (Detail) ¥ in Millions, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 CNY (¥) Customer Segment Unit	Dec. 31, 2025 USD ($) Segment Unit Customer	Dec. 31, 2024 CNY (¥) Unit Segment	Dec. 31, 2023 CNY (¥)	Dec. 31, 2025 USD ($) 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	6.9931				6.9931
Number of reportable segments \| Segment	2	2	2
Number of reporting units \| Unit	3	3	3
Advertising, marketing and promotional expenses	¥ 15,100.0	$ 2,200	¥ 13,800.0	¥ 13,200.0
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	4.19%	4.19%
Government Assistance, Asset, Decrease	¥ 86.0	$ 12
Government Assistance, Asset, Decrease, Statement of Financial Position [Extensible Enumeration]	Assets	Assets
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]	Operating Income (Loss)	Operating Income (Loss)
Impairment of long-lived assets	¥ 16,190.0	$ 2,315	0.0	0.0
Cash and cash equivalents, restricted cash, short-term investments, long-term time deposits and held-to-maturity investments	239,400.0				$ 34,200
Income from government subsidies	689.0	99	1,000.0	¥ 768.0
Baidu General Business excluding Smart Living Group ("SLG"), SLG and iQIYI
Accounting Policies [Abstract]
Impairment of goodwill \| ¥	0.0		0.0
Deferred Revenue
Accounting Policies [Abstract]
Contract with Customer, Liability, Revenue Recognized	¥ 7,200.0	$ 1,000
Maximum \| State Administration of Taxation, China
Accounting Policies [Abstract]
Deposit insurance system amount \| ¥						¥ 0.5
Maximum \| Inland Revenue, Hong Kong
Accounting Policies [Abstract]
Deposit insurance system amount \| $							$ 0.5
Short-term Investments \| 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]
Net value of contract assets	¥ 1,900.0		2,400.0		272
Customer deposits and deferred revenue
Accounting Policies [Abstract]
Contract liabilities	¥ 8,700.0		¥ 8,400.0		$ 1,200
Credit Concentration Risk \| Onshore China \| Financial Instruments
Accounting Policies [Abstract]
Concentration risk by percentage	63.00%	63.00%
Credit Concentration Risk \| Onshore China \| Financial Institution One
Accounting Policies [Abstract]
Concentration risk by percentage	12.00%	12.00%
Credit Concentration Risk \| Onshore China \| Financial Institution Two
Accounting Policies [Abstract]
Concentration risk by percentage	10.00%	10.00%
Credit Concentration Risk \| Onshore China \| Financial Institution Three
Accounting Policies [Abstract]
Concentration risk by percentage	8.00%	8.00%
Credit Concentration Risk \| Offshore China \| Financial Instruments
Accounting Policies [Abstract]
Concentration risk by percentage	37.00%	37.00%
Customer Concentration Risk \| Sales Revenue, Net \| Maximum
Accounting Policies [Abstract]
Concentration risk by percentage	10.00%	10.00%
Office building and its related facility, machinery and equipment
Accounting Policies [Abstract]
Property, plant and equipment, salvage value, percentage	4.00%				4.00%