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Operating Segments Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Geographic Information |
| 1) | Geographic information
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
Noncurrent Assets |  | (In Millions) |  |  | (In Millions) |
Taiwan |  | $ | 1,344,352.6 |  |  | $ | 1,569,080.4 |
United States |  |  | 8,850.1 |  |  |  | 9,455.5 |
China |  |  | 38,586.6 |  |  |  | 34,456.4 |
Europe, the Middle East and Africa |  |  | 186.2 |  |  |  | 174.2 |
Japan |  |  | 27.1 |  |  |  | 327.2 |
Others |  |  | 3.1 |  |  |  | 3.0 |
|  | $ | 1,392,005.7 |  |  | $ | 1,613,496.7 |
Major Customers Representing at Least 10% of Net Revenue |
| 2) | Major custom e rs representing at least 10% of net revenue
|  | Years Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | Amount |  |  | % |  |  | Amount |  |  | % |  |  | Amount |  |  | % |
|  | NT$ |  |  |  |  |  | NT$ |  |  |  |  |  | NT$ |  |  |  |
|  | (In Millions) |  |  |  |  |  | (In Millions) |  |  |  |  |  | (In Millions) |  |  |  |
Customer A |  | $ | 224,690.7 |  |  |  | 22 |  |  | $ | 247,213.3 |  |  |  | 23 |  |  | $ | 336,775.5 |  |  |  | 25 |
Customer B |  |  | 83,885.6 |  |  |  | 8 |  |  |  | 152,876.9 |  |  |  | 14 |  |  |  | 167,390.8 |  |  |  | 12 |

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