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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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