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Share-Based Awards Plan - Additional Information of Baidu, Inc. (Detail) $ / shares in Units, ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
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Jul. 31, 2018 shares | Nov. 30, 2017 shares | Oct. 31, 2010 | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 $ / shares | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 $ / shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2008 shares
Parent Company |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting power |  |  |  | 10.00% | 10.00% |  |  |  |  |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ / shares |  |  |  |  | $ 1,276 |  |  |  |  |  |
Parent Company | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  | ¥ 77 | $ 11 | ¥ 474 |  | ¥ 403 |  |  |
Total fair value of options vested |  |  |  | 216 | $ 31 | 956 |  | 195 |  |  |
Unrecognized share-based compensation cost |  |  |  | ¥ 439 |  |  |  |  |  | $ 63 |
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 |  |  |  |  |  |
The weighted-average grant-date fair value of options granted during respective years | $ / shares |  |  |  |  | $ 384 |  | $ 1,029 |  | $ 747 |  |
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 |  |  |  | ¥ 7,200 |  |  |  |  |  | $ 1,000 |
A weighted-average vesting period over which the deferred cost is expected to be recognized |  |  |  | 3 years 1 month 6 days | 3 years 1 month 6 days |  |  |  |  |  |
Total fair value of shares vested during respective years, restricted shares |  |  |  | ¥ 4,100 | $ 593 | ¥ 3,400 |  | ¥ 2,100 |  |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ / shares |  |  |  |  | $ 1,276 |  | $ 2,232 |  | $ 1,978 |  |
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 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  |  |  |  |  |  |  |  |  |  | 3,428,777
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 | 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 | 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 |  |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted | 10 years |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 589,729,714 |
Contractual term of share-based awards granted |  |  | 10 years |  |  |  |  |  |  |  |
Shares vesting term |  |  |  | 4 years | 4 years |  |  |  |  |  |
Unrecognized share-based compensation cost |  |  |  | ¥ 2,200 |  |  |  |  |  | $ 314 |
A weighted-average vesting period over which the deferred cost is expected to be recognized |  |  |  | 2 years 9 months 18 days | 2 years 9 months 18 days |  |  |  |  |  |
iQIYI | 2010 Equity Incentive Plan | First Anniversary [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  | 25.00% | 25.00% |  |  |  |  |  |
iQIYI | 2010 Equity Incentive Plan | Quarterly basis thereafter |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  | 75.00% | 75.00% |  |  |  |  |  |
iQIYI | 2017 Stock Incentive Plan. |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance |  | 720,000 |  |  |  |  |  |  |  |  |
Contractual term of share-based awards granted |  | 10 years |  |  |  |  |  |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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