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Changes in the Carrying Amount of Goodwill (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Goodwill [Line Items]      
Beginning Balance ¥ 22,477   ¥ 22,605
Goodwill disposed (5)   (128)
Goodwill acquired 114    
Ending Balance 22,586 $ 3,181 22,477
Baidu Core excluding SLG      
Goodwill [Line Items]      
Beginning Balance 16,874   16,940
Goodwill disposed 0   (66)
Goodwill acquired 114    
Ending Balance 16,988 2,393 16,874
SLG      
Goodwill [Line Items]      
Beginning Balance 1,777   1,777
Goodwill disposed 0   0
Goodwill acquired 0    
Ending Balance 1,777 250 1,777
iQIYI      
Goodwill [Line Items]      
Beginning Balance 3,826   3,888
Goodwill disposed (5)   (62)
Goodwill acquired 0    
Ending Balance ¥ 3,821 $ 538 ¥ 3,826