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Mezzanine equity (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands					4 Months Ended	12 Months Ended
	Mar. 08, 2018 CNY (¥) shares	Mar. 08, 2018 USD ($) shares	Jul. 10, 2017 CNY (¥) shares	Jul. 10, 2017 USD ($) $ / shares shares	May 11, 2018 CNY (¥)	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Redeemable NonControlling Interest Equity Stock Issued During Period Shares New Issues | shares			22,058,823	22,058,823		500,000,000	500,000,000
Redeemable NonControlling Interest Equity Stock Issued During Period Value New Issues			¥ 509,730	$ 75,000		¥ 345,420	$ 50,000
Temporary Equity, Accretion to Redemption Value						5,758		¥ 19,842
Derivative Liability						892,000
Derivative, Gain (Loss) on Derivative, Net						(2,285,223)	$ (332,372)	¥ 0	¥ 0
Proceeds from Issuance Initial Public Offering					¥ 795,073
Other Preferred Stock Dividends and Adjustments						489,284
Convertible Preferred Stock, Nonredeemable or Redeemable, Issuer Option, Value					¥ 4,009,874
Huya Broad casting [Member]
Derivative, Gain (Loss) on Derivative, Net						¥ (2,285,223)
Interest Ownership Percentage By Parent					44.00%
Additional Paid in Capital					¥ 4,804,947
Series A Preferred Shares [Member]
Shares Issued, Price Per Share | $ / shares				$ 3.4
Series B2 Preferred Shares [Member]
Redeemable NonControlling Interest Equity Stock Issued During Period Shares New Issues | shares	64,488,235	64,488,235
Redeemable NonControlling Interest Equity Stock Issued During Period Value New Issues	¥ 2,919,112	$ 461,600

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- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of preferred stock dividends and adjustments classified as other.

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