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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
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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 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 + Details
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