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Segment Information - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($)
Disclosure of operating segments [Line Items] |  |  |
Long-lived assets | $ 383,056 | $ 424,377 | $ 15,113
Information about major customers | Company did not have any single customer whose revenue exceeded 10% of the total revenues |  |
Overseas [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Long-lived assets | $ 4,063 | $ 3,746 |

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