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Fair Value Measurements - Fair value measurements (Details) - Significant Other Observable Inputs (Level 2) - CNY (¥) ¥ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Measurements
Held-to-maturity investments	¥ 34,481,053	¥ 7,630,689
Convertible bonds	¥ 8,037,280

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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- Details

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