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Share-Based Awards Plan - Additional Information of Baidu, Inc. (Detail)
$ / shares in Units, ¥ in Millions, $ in Millions
12 Months Ended
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