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Short-term Investments (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term Investments
Investment income related to short-term investments	¥ 639,800	¥ 580,700	¥ 657,600
Short-term investments
Short-term Investments
Cost	12,081,868	13,095,780
Unrealized Gains/(Losses)	199,680	177,246
Estimated Fair Value	¥ 12,281,548	¥ 13,273,026
Short-term investments | Equal to or more than
Short-term Investments
Short-term investments, effective yields (as a percent)	2.25%	2.52%
Short-term investments | Less than
Short-term Investments
Short-term investments, effective yields (as a percent)	4.40%	4.10%

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- Definition

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+ 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=123581744&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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