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Equity - Summary of Capital Stock (Detail) shares in Millions, $ in Millions, $ in Millions | Dec. 31, 2021 TWD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 TWD ($) shares
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Disclosure of classes of share capital [abstract] |  |  |
Authorized shares | 28,050.0 | 28,050.0 | 28,050.0
Authorized capital | $ | $ 280,500.0 |  | $ 280,500.0
Issued and paid shares | 25,930.3 | 25,930.3 | 25,930.3
Issued capital | $ 259,303.8 | $ 9,347.7 | $ 259,303.8

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