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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
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