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Operating Segments Information (Tables) | 12 Months Ended
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Dec. 31, 2017
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Segment Revenue and Operating Results |
b. | Segment revenue and operating results
|  | Foundry |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Net revenue from external customers |  | $ | 842,690.2 |  |  | $ | 807.2 |  |  | $ | 843,497.4 |
Income (loss) from operations |  |  | 320,833.2 |  |  |  | (785.4 | ) |  |  | 320,047.8 |
Share of profits (loss) of associates and joint venture |  |  | 4,582.0 |  |  |  | (385.6 | ) |  |  | 4,196.4 |
Income tax expense (benefit) |  |  | 47,646.5 |  |  |  | (1.8 | ) |  |  | 47,644.7 |
Geographic Information |
| c. | Geographic information
|  | Net Revenue from External Customers |  |  | Non-current Assets |
|  | Years Ended December 31 |  |  | December 31, |  |  | December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Taiwan |  | $ | 90,169.5 |  |  | $ | 127,063.0 |  |  | $ | 90,129.4 |  |  | $ | 991,567.9 |  |  | $ | 1,027,963.2 |
United States |  |  | 566,600.2 |  |  |  | 610,371.1 |  |  |  | 620,948.7 |  |  |  | 8,245.0 |  |  |  | 7,515.9 |
Asia |  |  | 123,705.9 |  |  |  | 146,907.4 |  |  |  | 194,477.1 |  |  |  | 14,071.3 |  |  |  | 44,213.4 |
Europe, the Middle East and Africa |  |  | 57,065.0 |  |  |  | 58,042.3 |  |  |  | 68,538.3 |  |  |  | 8.7 |  |  |  | 8.1 |
Others |  |  | 5,956.8 |  |  |  | 5,554.5 |  |  |  | 3,353.7 |  |  |  | — |  |  |  | — |
|  | $ | 843,497.4 |  |  | $ | 947,938.3 |  |  | $ | 977,447.2 |  |  | $ | 1,013,892.9 |  |  | $ | 1,079,700.6 |
Production Information |
| d. | Production information
|  | Years Ended December 31 |
Production |  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Wafer |  | $ | 766,228.8 |  |  | $ | 861,170.8 |  |  | $ | 874,572.6 |
Others |  |  | 77,268.6 |  |  |  | 86,767.5 |  |  |  | 102,874.6 |
|  | $ | 843,497.4 |  |  | $ | 947,938.3 |  |  | $ | 977,447.2 |
Major Customers Representing at Least 10% of Net Revenue |
| e. | Major customers representing at least 10% of net revenue
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | Amount |  |  | % |  |  | Amount |  |  | % |  |  | Amount |  |  | % |
|  | NT$ |  |  |  |  |  | NT$ |  |  |  |  |  | NT$ |  |  |  |
|  | (In Millions) |  |  |  |  |  | (In Millions) |  |  |  |  |  | (In Millions) |  |  |  |
Customer A |  | $ | 134,117.2 |  |  |  | 16 |  |  | $ | 157,185.4 |  |  |  | 17 |  |  | $ | 214,228.8 |  |  |  | 22 |
Customer B |  |  | 134,158.4 |  |  |  | 16 |  |  |  | 107,463.2 |  |  |  | 11 |  |  |  | 64,096.2 |  |  |  | 7 |

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