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Computation of Basic and Diluted Earnings Per Class A and Class B Ordinary Share (Detail)
¥ / shares in Units, $ / shares in Units, ¥ in Millions, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Numerator        
Allocation of net income attributable to Baidu, Inc. ¥ 19,598 $ 2,760 ¥ 6,968 ¥ 9,876
Numerator        
Numerator for diluted EPS calculation 19,554 2,754 6,968 9,876
Class A Ordinary Shares        
Numerator        
Allocation of net income attributable to Baidu, Inc. ¥ 15,905 $ 2,240 ¥ 5,590 ¥ 7,871
Denominator        
Denominator used for basic EPS 2,278 2,278 2,232 2,198
Earnings per share - basic | (per share) ¥ 6.98 $ 0.98 ¥ 2.5 ¥ 3.58
Numerator        
Allocation of net income attributable to Baidu, Inc. for diluted computation ¥ 15,909 $ 2,241 ¥ 5,604 ¥ 7,910
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares 3,645 513 1,364 1,966
Numerator for diluted EPS calculation ¥ 19,554 $ 2,754 ¥ 6,968 ¥ 9,876
Denominator        
Weighted average ordinary shares outstanding 2,278 2,278 2,232 2,198
Conversion of Class B to Class A ordinary shares 529 529 550 560
Share-based awards 30 30 27 56
Denominator used for diluted EPS 2,837 2,837 2,809 2,814
Earnings per share - diluted | (per share) ¥ 6.89 $ 0.97 ¥ 2.48 ¥ 3.51
Class A Ordinary Shares | American Depositary Shares        
Denominator        
Denominator used for basic EPS 285 285 279 275
Earnings per share - basic | (per share) ¥ 55.83 $ 7.86 ¥ 20.02 ¥ 28.64
Denominator        
Weighted average ordinary shares outstanding 285 285 279 275
Denominator used for diluted EPS 355 355 351 352
Earnings per share - diluted | (per share) ¥ 55.08 $ 7.76 ¥ 19.85 ¥ 28.07
Class B Ordinary Shares        
Numerator        
Allocation of net income attributable to Baidu, Inc. ¥ 3,693 $ 520 ¥ 1,378 ¥ 2,005
Denominator        
Denominator used for basic EPS 529 529 550 560
Earnings per share - basic | (per share) ¥ 6.98 $ 0.98 ¥ 2.5 ¥ 3.58
Numerator        
Allocation of net income attributable to Baidu, Inc. for diluted computation ¥ 3,645 $ 513 ¥ 1,364 ¥ 1,966
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares 0 0 0 0
Numerator for diluted EPS calculation ¥ 3,645 $ 513 ¥ 1,364 ¥ 1,966
Denominator        
Weighted average ordinary shares outstanding 529 529 550 560
Conversion of Class B to Class A ordinary shares 0 0 0 0
Share-based awards 0 0 0 0
Denominator used for diluted EPS 529 529 550 560
Earnings per share - diluted | (per share) ¥ 6.89 $ 0.97 ¥ 2.48 ¥ 3.51