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Investment in equity investees (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Measurement Alternative and NAV practical expedient investments |  |
Carrying amount of cost method investments |  | ¥ 9,750,726
Carrying amount of investment under NAV practical expedient | ¥ 944,378 |
Carrying values of equity investments measured at fair value using the Measurement Alternative | 17,104,784 |
Measurement Alternative investments | 12,108,139 | ¥ 6,217,682
Top investee one |  |
Measurement Alternative and NAV practical expedient investments |  |
Measurement Alternative investments | 4,990,531 |
Top investee two |  |
Measurement Alternative and NAV practical expedient investments |  |
Measurement Alternative investments | ¥ 1,952,325 |

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- Definition Amount of alternative investments, over which the Group do not have the ability to exercise significant influence, and are accounted for under the existing practical expedient in ASC Topic 820, Fair Value Measurements and Disclosures ("ASC 820") to estimate fair value using the net asset value per share (or its equivalent) of the investment ("NAV practical expedient"). + References No definition available. + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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