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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. 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