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Segment Reporting - Summary of Revenue Disaggregated by Revenue (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Disaggregation of Revenue [Line Items]        
Total revenues ¥ 134,598 $ 18,958 ¥ 123,675 ¥ 124,493
Operating Segments | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues 103,465 14,573 95,431 95,163
Operating Segments | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues 31,873 4,489 28,998 30,554
Operating Segments | Online marketing services | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues 75,112 10,579 69,522 73,919
Operating Segments | Cloud services | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 18,718 2,636 17,721 15,070
Operating Segments | Membership services | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 20,314 2,861 17,711 16,714
Operating Segments | Online advertising services | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [2] 6,224 877 5,332 7,067
Operating Segments | Content distribution | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 2,459 346 2,562 3,007
Operating Segments | Others | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 9,635 1,358 8,188 6,174
Operating Segments | Others | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 2,876 405 3,393 3,766
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenues ¥ (740) $ (104) ¥ (754) ¥ (1,224)
[1] The revenues were presented as “Others” in the consolidated statements of comprehensive income
[2] The revenues were presented as “Online marketing services” in the consolidated statements of comprehensive income