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Share-Based Awards Plan - Additional Information of Baidu, Inc. (Detail) $ / shares in Units, ¥ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |
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Dec. 02, 2021 shares $ / shares | Sep. 15, 2020 | Jul. 31, 2018 shares | Oct. 31, 2010 shares | Dec. 31, 2008 shares | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 $ / shares | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 $ / shares | Dec. 31, 2021 CNY (¥) | Dec. 31, 2023 USD ($) | Aug. 31, 2023 shares
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Percentage of voting power |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ / shares |  |  |  |  |  |  | $ 17 |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Parent Company | Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  |  | ¥ 64 | $ 9 |  | ¥ 124 |  | ¥ 210 |  |
Total fair value of options vested |  |  |  |  |  | 85 | $ 12 |  | 193 |  | 217 |  |
Unrecognized share-based compensation cost |  |  |  |  |  | ¥ 50 |  |  |  |  |  | $ 7 |
A weighted-average vesting period over which the deferred cost is expected to be recognized |  |  |  |  |  | 2 years 1 month 6 days | 2 years 1 month 6 days |  |  |  |  |  |
The weighted-average grant-date fair value of options granted during respective years | $ / shares |  |  |  |  |  |  |  | $ 8 |  | $ 12 |  |  |
Parent Company | Stock Options | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting term |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |
Parent Company | Stock Options | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting term |  |  |  |  |  | 2 years | 2 years |  |  |  |  |  |
Parent Company | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation cost |  |  |  |  |  | ¥ 4,900 |  |  |  |  |  | $ 686 |
A weighted-average vesting period over which the deferred cost is expected to be recognized |  |  |  |  |  | 2 years 7 months 6 days | 2 years 7 months 6 days |  |  |  |  |  |
Total fair value of shares vested during respective years, restricted shares |  |  |  |  |  | ¥ 6,100 | $ 861 |  | ¥ 6,200 |  | ¥ 5,000 |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ / shares |  |  |  |  |  |  | $ 17 | $ 15 |  | $ 23 |  |  |
Parent Company | Employee Holding More Than Ten Percent Voting Power | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the fair market value of the entity's ordinary shares |  |  |  |  |  | 110.00% |  |  |  |  |  | 110.00% |
Parent Company | 2008 Plan | Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  |  |  | 3,428,777 |  |  |  |  |  |  |  |
Parent Company | 2008 Plan | Revision of Prior Period, Reclassification, Adjustment [Member] | Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  |  |  | 274,302,160 |  |  |  |  |  |  |  |
Parent Company | 2008 Plan | Employee Holding No More Than Ten Percent Voting Power | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Parent Company | 2008 Plan | Employee Holding More Than Ten Percent Voting Power | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Parent Company | Stock Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  | 3,443,950 |  |  |  |  |  |  |  |  |  |
Parent Company | Stock Incentive Plan 2018 [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  | 275,516,000 |  |  |  |  |  |  |  |  |  |
Parent Company | 2023 Share Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 281,230,346
iQIYI | 2010 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  |  | 589,729,714 |  |  |  |  |  |  |  |  |
Shares vesting term |  |  |  | 4 years |  |  |  |  |  |  |  |  |
iQIYI | 2010 Equity Incentive Plan | Original Term |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted |  |  |  | 10 years |  |  |  |  |  |  |  |  |
iQIYI | 2010 Equity Incentive Plan | Modified Term |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted |  | 20 years |  |  |  |  |  |  |  |  |  |  |
iQIYI | 2010 and 2021 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation cost |  |  |  |  |  | ¥ 878 |  |  |  |  |  | $ 124 |
A weighted-average vesting period over which the deferred cost is expected to be recognized |  |  |  |  |  | 2 years 6 months | 2 years 6 months |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  | $ 0.08 |  |  |  |  |  |
iQIYI | 2021 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance | 364,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Reduction is ordinary shares for issuance of each restricted stock unit | 1.3 |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Other Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting term |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |

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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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