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Share repurchase program (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 USD ($) $ / shares shares | Nov. 30, 2021 USD ($)
Shares repurchased during the year | ¥ |  |  | ¥ 5,246 |  | ¥ 312 |  | ¥ 131 |  |  |  |
ADS | 2020 Share repurchase program |  |  |  |  |  |  |  |  |  |  |
Authorized amount | $ | $ 2,000 |  |  |  |  |  |  |  |  |  |
Repurchase period (in months) | 24 months |  |  |  |  |  |  |  |  |  |
Shares repurchased during the year (in ADS shares) | shares |  |  | 10,214,827 | 10,214,827 | 1,191,370 | 1,191,370 |  |  |  |  |
Shares repurchased during the year |  |  | ¥ 5,246 | $ 806 | ¥ 312 | $ 44 |  |  |  |  |
Weighted average repurchase price (in dollars per ADS) | $ / shares |  |  |  | $ 78.92 |  | $ 37.04 |  |  |  |  |
Share Repurchase Authorization | $ |  |  |  | $ 3,000 |  |  |  |  |  |  | $ 2,000
ADS | 2018 Share repurchase program |  |  |  |  |  |  |  |  |  |  |
Authorized amount | $ |  | $ 1,000 |  |  |  |  |  |  |  | $ 1,000 |
Shares repurchased total (in ADS shares) | shares |  | 2,332,048 |  |  |  |  |  |  |  | 2,332,048 |
Repurchase period (in months) |  | 12 months |  |  |  |  |  |  |  |  |
Shares repurchased during the year (in ADS shares) | shares |  |  |  |  |  |  | 935,848 | 935,848 | 1,396,200 | 1,396,200 |
Shares repurchased during the year |  |  |  |  |  |  | ¥ 131 | $ 19 | ¥ 206 | $ 30 |
Weighted average repurchase price (in dollars per ADS) | $ / shares |  |  |  |  |  |  |  | $ 20.41 |  | $ 21.48 |

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- Definition Total shares repurchased under stock ​repurchase ​program. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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