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Principal Accounting Policies (Details 6) ¥ in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Goodwill |  |  |  |
Impairment charge of goodwill | ¥ 0 |  |  |
Advertising Expense |  |  |  |
Advertising expenses | ¥ 3,782,100 | $ 579.6 | ¥ 1,679,300 | ¥ 2,222,200
Foreign currency translation |  |  |  |
Buying rate per US$ | 6.5250 | 6.5250 |  |
Licensing Rights |  |  |  |
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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