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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, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
$ / shares
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
$ / shares
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2008
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           $ 15            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares           $ 20            
Parent Company | Stock Options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Total intrinsic value of options exercised         ¥ 124 $ 18   ¥ 210   ¥ 157    
Total fair value of options vested         193 $ 28   217   261    
Unrecognized share-based compensation cost         ¥ 103           $ 15  
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           $ 8 $ 12   $ 9      
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         ¥ 6,300           $ 908  
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         ¥ 6,200 $ 895   ¥ 5,000   ¥ 4,600    
The weighted-average grant-date fair value of restricted shares granted during respective years | $ / shares           $ 15 $ 23   $ 14      
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 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                  
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                  
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 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         ¥ 925           $ 134  
A weighted-average vesting period over which the deferred cost is expected to be recognized         2 years 3 months 18 days 2 years 3 months 18 days            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares           $ 0.11            
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