v3.22.1
Segment Reporting - Summary of Revenue Disaggregated by Revenue (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Disaggregation of Revenue [Line Items]        
Total revenues ¥ 124,493 $ 19,536 ¥ 107,074 ¥ 107,413
Operating Segments | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues 95,163 14,933 78,684 79,711
Operating Segments | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues 30,554 4,795 29,707 28,994
Operating Segments | Online marketing services | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues 73,919 11,600 66,283 70,038
Operating Segments | Cloud services | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 15,070 2,365 9,173 6,370
Operating Segments | Membership services | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 16,714 2,623 16,491 14,436
Operating Segments | Online advertising services | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [2] 7,067 1,109 6,822 8,271
Operating Segments | Content distribution | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 2,856 448 2,660 2,544
Operating Segments | Others | Baidu Core        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 6,174 968 3,228 3,303
Operating Segments | Others | iQIYI        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 3,917 615 3,734 3,743
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenues ¥ (1,224) $ (192) ¥ (1,317) ¥ (1,292)
[1] The revenues were presented as “Others” in the consolidated statements of comprehensive (loss) income
[2] The revenues were presented as “Online marketing services” in the consolidated statements of comprehensive (loss) income