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Principal Accounting Policies - Share-based compensation (Details) - 12 months ended Dec. 31, 2019 ¥ in Millions, $ in Millions	CNY (¥)	USD ($)
Accounting Policies [Abstract]
Incremental compensation cost	¥ 31.6	$ 4.5

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- References

No definition available.

+ Details

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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