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Short-term Investments (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Short-term Investments |  |  |
Investment income related to short-term investments | ¥ 580,700 | ¥ 657,600 | ¥ 463,500
Short-term investments |  |  |
Short-term Investments |  |  |
Cost | 13,095,780 | 15,116,330 |
Unrealized Gains/(Losses) | 177,246 | 196,265 |
Estimated Fair Value | ¥ 13,273,026 | ¥ 15,312,595 |
Short-term investments | Equal to or more than |  |  |
Short-term Investments |  |  |
Short-term investments, effective yields (as a percent) | 2.52% | 2.00% |
Short-term investments | Less than |  |  |
Short-term Investments |  |  |
Short-term investments, effective yields (as a percent) | 4.10% | 4.25% |

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- Definition Rate of interest on investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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