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Operating Segments Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Geographic Information |
| 1) | Geographic information
|  | Net Revenue from External Customers |  |  | Noncurrent Assets |
|  | Years Ended December 31 |  |  | December 31, |
|  | 2016 |  |  | 2017 |  |  | 2017 |  |  | 2018 |
|  | NT$ (In Millions) |  |  | NT$ (In Millions) |  |  | NT$ (In Millions) |  |  | NT$ (In Millions) |
Taiwan |  | $ | 125,106.7 |  |  | $ | 88,046.1 |  |  | $ | 1,027,963.2 |  |  | $ | 1,039,471.3 |
United States |  |  | 626,434.8 |  |  |  | 635,851.7 |  |  |  | 7,515.9 |  |  |  | 7,569.8 |
China |  |  | 82,634.1 |  |  |  | 110,201.4 |  |  |  | 44,204.9 |  |  |  | 43,574.5 |
Europe, the Middle East and Africa |  |  | 58,112.4 |  |  |  | 69,046.8 |  |  |  | 8.1 |  |  |  | 8.3 |
Japan |  |  | 44,373.0 |  |  |  | 60,628.0 |  |  |  | 8.5 |  |  |  | 13.1 |
Others |  |  | 11,277.3 |  |  |  | 13,673.2 |  |  |  | — |  |  |  | — |
|  | $ | 947,938.3 |  |  | $ | 977,447.2 |  |  | $ | 1,079,700.6 |  |  | $ | 1,090,637.0 |
Production Information |
| 2) | Product information
|  | Years Ended December 31 |
Product |  | 2016 |  |  | 2017 |
|  | NT$ (In Millions) |  |  | NT$ (In Millions) |
Wafer |  | $ | 861,519.9 |  |  | $ | 875,461.4 |
Others |  |  | 86,418.4 |  |  |  | 101,985.8 |
|  | $ | 947,938.3 |  |  | $ | 977,447.2 |
Major Customers Representing at Least 10% of Net Revenue |
| 3) | Major customers representing at least 10% of net revenue
|  | Years Ended December 31 |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  | Amount |  |  | % |  |  | Amount |  |  | % |  |  | Amount |  |  | % |
|  | NT$ (In Millions) |  |  |  |  |  | NT$ (In Millions) |  |  |  |  |  | NT$ (In Millions) |  |  |  |
Customer A |  | $ | 161,261.4 |  |  |  | 17 |  |  | $ | 220,463.1 |  |  |  | 23 |  |  | $ | 224,690.7 |  |  |  | 22 |
Customer B |  |  | 106,541.9 |  |  |  | 11 |  |  |  | 63,805.9 |  |  |  | 7 |  |  |  | 59,149.0 |  |  |  | 6 |

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