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Investments - Long-term Investments - Additional information (Detail) ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2018 | Dec. 31, 2023 CNY (¥) Directors shares | Dec. 31, 2023 USD ($) Directors shares | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2023 USD ($) shares
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Impairment charges recognized on equity investments measured at fair value using the measurement alternative |  | ¥ 753 | $ 106 | ¥ 2,456 |  | ¥ 4,259 |
Impairment recognized for equity method investments |  | 62 | 9 | 569 |  | 57 |
Carrying amount of equity method investments |  | 20,800 |  | 25,900 |  |  | $ 2,900
Share of losses from equity method investments after modification | ¥ |  | 3,000 |  |  |  |  |
Share of losses from equity method investments |  | (3,799) | (535) | (1,910) |  | (932) |
Payment to acquire equity investments without readily determinable fair value |  | ¥ 1,487 | $ 209 | ¥ 3,628 |  | ¥ 3,395 |
Trip.com International, Ltd |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Percentage Of equity interest held by company |  | 9.00% |  | 12.00% |  |  | 9.00%
Fair value of equity investment |  | ¥ 15,100 |  |  |  |  | $ 2,100
Gains on equity method investments | ¥ |  | ¥ 1,400 |  |  |  |  |
Equity method investment, disposal of ADS | shares |  | 10,000,000 | 10,000,000 |  |  |  |
Number of directors | Directors |  | 8 | 8 |  |  |  |
Trip.com International, Ltd | Active directors |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Number of directors | Directors |  | 1 | 1 |  |  |  |
Jidu Auto Inc [Member] |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Payment to acquire equity method investments |  |  |  |  | $ 371 |  |
Payment to acquire equity investments without readily determinable fair value |  |  | $ 193 |  |  |  |
Jidu Auto Inc [Member] | Series C Warrant [Member] |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Payments for purchase of warrants | ¥ |  | ¥ 650 |  |  |  |  |
Jidu Auto Inc [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Class of warrant or right | shares |  | 14,443,320 |  |  |  |  | 14,443,320
Jidu Auto Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Payment to acquire equity method investments |  |  |  |  | 171 |  |
Jidu Auto Inc [Member] | In Substance Common Stock [Member] |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Payment to acquire equity method investments |  |  |  |  | $ 200 |  |
Jidu Auto Inc [Member] | Equity Investment |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Percentage Of equity interest held by company |  | 51.14% |  |  |  |  | 51.14%
Du Xiaoman Financial |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Equity interest percentage | 41.00% |  |  |  |  |  |

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