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Share Repurchase Programs (Details) ¥ in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) | Feb. 29, 2020 USD ($) | Nov. 30, 2019 USD ($) shares | Nov. 30, 2018 USD ($) shares | Nov. 30, 2017 USD ($) | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | May 19, 2020 USD ($) | Jun. 11, 2018 USD ($)
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Value of shares repurchased | ¥ |  |  |  |  |  | ¥ 11,273,814 |  | ¥ 1,467 | ¥ 7,592,598 |  |
American Depositary Shares | 2017 share repurchase program |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  |  |  | $ 1,000.0 |  |  |  |  |  | $ 2,000.0
Share repurchase program period, maximum |  |  |  |  | 12 months |  |  |  |  |  |
Additional authorized amount |  |  |  |  |  |  |  |  |  |  | $ 1,000.0
Shares repurchased (in shares) | shares |  |  |  | 23,000,000.0 |  |  |  |  |  |  |
Value of shares repurchased |  |  |  | $ 1,178.5 |  |  |  |  |  |  |
American Depositary Shares | 2018 share repurchase program |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  |  | $ 1,000.0 |  |  |  |  |  |  |
Share repurchase program period, maximum |  |  |  | 12 months |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  | 5,075 |  |  |  |  |  |  |  |
Value of shares repurchased |  |  | $ 0.2 |  |  |  |  |  |  |  |
American Depositary Shares | 2019 share repurchase program | Youdao |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  | $ 20.0 |  |  |  |  |  |  |  |
Share repurchase program period, maximum |  |  | 12 months |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 198,000 | 198,000 |  |  |  |
Value of shares repurchased |  |  |  |  |  |  | $ 3.4 |  |  |  |
American Depositary Shares | 2020 share repurchase program |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  | $ 1,000.0 |  |  |  |  |  |  |  |  |
Share repurchase program period, maximum |  | 12 months |  |  |  |  |  |  |  |  |
Additional authorized amount |  |  |  |  |  |  |  |  |  | $ 1,000.0 |
Shares repurchased (in shares) | shares |  |  |  |  |  | 21,100,000 | 21,100,000 |  |  |  |
Value of shares repurchased |  |  |  |  |  |  | $ 1,625.1 |  |  |  |
American Depositary Shares | 2021 share repurchase program | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Authorized amount | $ 2,000.0 |  |  |  |  |  |  |  |  |  |
Share repurchase program period, maximum | 24 months |  |  |  |  |  |  |  |  |  |
Ordinary shares | 2017 share repurchase program |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  | 114,900,000 |  |  |  |  |  |  |
Ordinary shares | 2018 share repurchase program |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  | 25,375 |  |  |  |  |  |  |  |
Ordinary shares | 2020 share repurchase program |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 105,500,000 | 105,500,000 |  |  |  |

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