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Operating Segments Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Texts Block [Abstract] |
Geographic Information |
| 1) | Geographic information
|  | December 31, |  |  |  |  |  | December 31, |
|  | 2023 |  |  |  |  |  | 2024 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  |  |  |  | NT$ |  |  |  |
Noncurrent Assets |  | (In Millions) |  |  |  |  |  | (In Millions) |
Taiwan |  |  |  |  |  |  | $2,525,608.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $2,613,112.2 |  |  |  |  |
United States |  |  |  |  |  |  | 420,093.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 541,836.3 |  |  |  |  |
Japan |  |  |  |  |  |  | 94,558.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126,600.6 |  |  |  |  |
China |  |  |  |  |  |  | 97,268.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,405.8 |  |  |  |  |
Europe, the Middle East and Africa |  |  |  |  |  |  | 146.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,150.1 |  |  |  |  |
Others |  |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.4 |  |  |  |  |
|  |  |  |  |  | $ | 3,137,675.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 3,383,106.4 |  |  |  |  |
Major Customers Representing at Least 10% of Net Revenue |
| 2) | Major customers representing at least 10% of net revenue
|  | Years Ended December 31
|  | 2022 |  | 2023 |  | 2024
|  | Amount |  |  | % |  | Amount |  | % |  | Amount |  | %
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  |  |  |  |  |  | NT$ |  |  |  |  |  |  |  |  |  |  |  |  | NT$ |  |  |  |  |  |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  |
Customer A |  |  |  |  |  | $ | 529,649.2 |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  | $ | 546,550.9 |  |  |  |  |  |  | 25 |  |  |  |  |  | $ | 624,345.5 |  |  |  |  |  |  | 22 |  |
Customer B |  |  |  |  |  |  | NA (Note) |  |  |  |  |  |  |  |  | NA |  |  |  |  |  |  | NA (Note) |  |  |  |  |  |  | NA |  |  |  |  |  |  | 352,271.2 |  |  |  |  |  |  | 12 |  |
Customer C |  |  |  |  |  |  | NA (Note) |  |  |  |  |  |  |  |  | NA |  |  |  |  |  |  | 241,152.4 |  |  |  |  |  |  | 11 |  |  |  |  |  |  | NA (Note) |  |  |  |  |  |  | NA |  |
Note:  Revenue less than 10% of the Company’s net revenue.

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