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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. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 $ / shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 $ / shares | Dec. 31, 2017 CNY (¥) 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 | $ 1,977.57 |  |  |  |  |  |
Parent Company | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total intrinsic value of options exercised | $ 62 | ¥ 403 | ¥ 143 |  | ¥ 200 |  |
Total fair value of options vested | 30 | ¥ 195 | 225 |  | 149 |  |
Unrecognized share-based compensation cost | $ 91 |  |  |  |  |  | ¥ 592
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 |  |  |  |  |
The weighted-average grant-date fair value of options granted during respective years | $ 747.45 |  |  | $ 659.70 |  | $ 790.00 |
Parent Company | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized share-based compensation cost | $ 813 |  |  |  |  |  | ¥ 5,300
A weighted-average vesting period over which the deferred cost is expected to be recognized | 2 years 10 months 25 days | 2 years 10 months 25 days |  |  |  |  |
Total fair value of shares vested during respective years, restricted shares | $ 317 | ¥ 2,100 | ¥ 1,100 |  | ¥ 701 |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ 1,977.57 |  |  | $ 1,755.90 |  | $ 1,979.30 |
Parent Company | Restricted Stock | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 4 years | 4 years |  |  |  |  |
Parent Company | Restricted Stock | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 2 years | 2 years |  |  |  |  |
Parent Company | 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 | 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 | 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 | shares | 3,428,777 |  |  |  |  |  | 3,428,777
Parent Company | 2008 Plan | Stock Options | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 4 years | 4 years |  |  |  |  |
Parent Company | 2008 Plan | Stock Options | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 2 years | 2 years |  |  |  |  |
iQIYI |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized share-based compensation cost | $ 73 |  |  |  |  |  | ¥ 476
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 |  |  |  |  |

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- Definition The minimum percentage of voting power held by an employee whose granted incentive share option's term are subject to a maximum of five years, and the exercise price cannot be less than 110% of the fair market value of the company's ordinary shares on the date of that grant. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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