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Taxation (Details) ¥ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 CNY (¥) ¥ / shares | Dec. 31, 2021 HKD ($) | Dec. 31, 2020 CNY (¥) ¥ / shares | Dec. 31, 2020 HKD ($) | Dec. 31, 2019 CNY (¥) ¥ / shares | Dec. 31, 2019 HKD ($) | Dec. 31, 2018
Income taxes |  |  |  |  |  |  |
Income tax rate (as a percent) | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% |
Combined effects of EIT exemptions and tax rate reductions |  |  |  |  |  |  |
Aggregate amount of EIT exemptions and tax rate reductions | ¥ 2,238,907,000 |  | ¥ 1,969,414,000 |  | ¥ 1,665,199,000 |  |
Earnings per share effect, basic (in CNY per share) | ¥ / shares | ¥ 0.67 |  | ¥ 0.60 |  | ¥ 0.52 |  |
Earnings per share effect, diluted (in CNY per share) | ¥ / shares | ¥ 0.66 |  | ¥ 0.59 |  | ¥ 0.51 |  |
Cayman Islands |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Withholding tax amount | ¥ 0 |  |  |  |  |  |
BVI |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Withholding tax amount | ¥ 0 |  |  |  |  |  |
Hong Kong |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Income tax rate (as a percent) | 16.50% | 16.50% | 16.50% | 16.50% | 16.50% | 16.50% |
Taxable income | $ |  | $ 2 |  | $ 2 |  | $ 2 |
Hong Kong | Taxable income below threshold amount |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Income tax rate (as a percent) | 8.25% | 8.25% | 8.25% | 8.25% | 8.25% | 8.25% |
Hong Kong | Taxable income over threshold amount |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Income tax rate (as a percent) | 16.50% | 16.50% | 16.50% | 16.50% | 16.50% | 16.50% |
PRC |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Income tax rate (as a percent) | 25.00% | 25.00% |  |  |  |  |
PRC | Boguan, NetEase Hangzhou and certain other PRC subsidiaries | HNTEs |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Preferential tax rate | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% |
PRC | Boguan, NetEase Hangzhou and certain other PRC subsidiaries | Key Software Enterprise |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |
Preferential tax rate |  |  |  |  | 10.00% | 10.00% | 10.00%

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