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Investment in equity investees (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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

Original cost of investment in equity security without readily determinable fair value.

+ References

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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").

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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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

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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.

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