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Principal accounting policies (Sales and Marketing Expenses, Share based Compensation, Statutory Reserves, Dividends and Segment Reporting - Narrative) (Details) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory reserves [Line Item]
Advertising and market promotion expenses	¥ 2,981,328	¥ 1,065,866	¥ 621,771
Employee social security and welfare benefits	¥ 509,375	286,139	214,848
Minimum percentage appropriation to statutory surplus fund required	10.00%
Surplus fund threshold for mandatory appropriation requirement (as a percent)	50.00%
Amount appropriated to statutory reserves	¥ 0	¥ 0	¥ 0
Dividends declared	¥ 0	¥ 0	¥ 0
Statutory reserves
Statutory reserves [Line Item]
Amount appropriated to statutory reserves	¥ 48,236	¥ 39,007	¥ 3,861
VIEs registered as PRC domestic companies
Statutory reserves [Line Item]
Minimum percentage appropriation to statutory surplus fund required	10.00%
Surplus fund threshold for mandatory appropriation requirement (as a percent)	50.00%

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Topic 505
-SubTopic 10
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-Paragraph 1
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-SubTopic 70
-Section 50
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The total expense recognized in the period for promotion, public relations, and brand or product advertising.

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-SubTopic 10
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Represents Statutory reserves appropriated during the period.

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- Definition

Represents the minimum percentage of after-tax profit required to be appropriated towards the statutory surplus fund for the entities incorporated in the People's Republic Of China until the reserve balance reaches 50 percent of registered capital.

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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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Represents the level of the statutory surplus fund balance as a percentage of registered capital for the entities incorporated in the People's Republic of China, which must be attained before mandatory transfers to the fund are no longer required.

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