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Segment Reporting - Summary of Revenue Disaggregated by Revenue (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
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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

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