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Treasury shares (Details) ¥ in Thousands, $ in Millions		12 Months Ended
	Nov. 17, 2015 USD ($)	Dec. 31, 2018 shares	Dec. 31, 2017 shares	Dec. 31, 2016 CNY (¥) shares
Treasury shares
Repurchase of treasury stock (in shares)				1,614,135
Repurchase of treasury stock | ¥				¥ 844,711
Treasury stock, shares		0
Payables for repurchase of ordinary shares | ¥				¥ 194,514
Treasury shares re-issued to employees for share awards (in shares)		0	1,356,918	257,217
ADS
Treasury shares
Term of share repurchase program	24 months
ADS | Maximum
Treasury shares
Stock repurchase program, authorized amount | $	$ 300

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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