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Share-Based Awards Plan - Additional Information of Baidu, Inc. (Detail)
$ / shares in Units, ¥ in Millions, $ in Millions
12 Months Ended
May 08, 2024
shares
Dec. 02, 2021
shares
$ / shares
Sep. 15, 2020
Jul. 31, 2018
shares
Oct. 31, 2010
shares
Dec. 31, 2008
shares
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
$ / shares
Dec. 31, 2022
CNY (¥)
Dec. 31, 2024
USD ($)
Aug. 31, 2023
shares
Aug. 06, 2016
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               $ 11              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares               $ 0              
Parent Company | Employee Stock Option                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total intrinsic value of options exercised | ¥                 ¥ 64   ¥ 124      
Total fair value of options vested             36 $ 5   85   193      
Unrecognized share-based compensation cost             ¥ 7           $ 1    
A weighted-average vesting period over which the deferred cost is expected to be recognized             1 year 1 year              
The weighted-average grant-date fair value of options granted during respective years | $ / shares                     $ 8        
Parent Company | Employee Stock Option | Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares vesting term             4 years 4 years              
Parent Company | Employee Stock Option | 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             ¥ 3,700           $ 508    
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             ¥ 4,400 $ 603   ¥ 6,100   ¥ 6,200      
The weighted-average grant-date fair value of restricted shares granted during respective years | $ / shares               $ 11 $ 17   $ 15        
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 | Revision of Prior Period, Reclassification, Adjustment | 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 | Revision of Prior Period, Reclassification, Adjustment                              
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         58,875,478                   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             ¥ 776           $ 104    
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               $ 0.01              
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                          
iQIYI | 2024 Equity Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares authorized for issuance 350,000,000                            
Contractual term of share-based awards granted 10 years                            
Other Subsidiaries                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares vesting term                   4 years