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Principal Accounting Policies - Intangible assets, advertising and promotional expenses and foreign currency translation (Details) ¥ in Billions, $ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 29, 2023 $ / ¥
Advertising and promotional expenses |  |  |  |  |
Advertising and promotional expenses | ¥ 10.4 | $ 1.5 | ¥ 10.0 | ¥ 8.9 |
Foreign currency translation |  |  |  |  |
Buying rate per US$ |  |  |  |  | 7.0999
License right |  |  |  |  |
Intangible assets |  |  |  |  |
Estimated useful lives of assets | over the license period | over the license period |  |  |
Technology | Equal to or more than |  |  |  |  |
Intangible assets |  |  |  |  |
Estimated useful lives of assets | 7 years | 7 years |  |  |
Technology | Less than |  |  |  |  |
Intangible assets |  |  |  |  |
Estimated useful lives of assets | 10 years | 10 years |  |  |
Trademark |  |  |  |  |
Intangible assets |  |  |  |  |
Estimated useful lives of assets | 10 years | 10 years |  |  |

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