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Operating Segments Information (Tables) | 12 Months Ended
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Dec. 31, 2019
TextBlock [abstract] |
Geographic Information |
| 1) | Geographic information
|  | Net Revenue from External Customers |  |  |  |  |  |  |
|  | Year Ended |  |  | Noncurrent Assets |
|  | December 31 |  |  | December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Taiwan |  | $ | 88,046.1 |  |  | $ | 1,039,471.3 |  |  | $ | 1,344,352.6 |
United States |  |  | 635,851.7 |  |  |  | 7,569.8 |  |  |  | 8,850.1 |
China |  |  | 110,201.4 |  |  |  | 43,574.5 |  |  |  | 38,586.6 |
Europe, the Middle East and Africa |  |  | 69,046.8 |  |  |  | 8.3 |  |  |  | 186.2 |
Japan |  |  | 60,628.0 |  |  |  | 13.1 |  |  |  | 27.1 |
Others |  |  | 13,673.2 |  |  |  | — |  |  |  | 3.1 |
|  | $ | 977,447.2 |  |  | $ | 1,090,637.0 |  |  | $ | 1,392,005.7 |
Production Information |
| 2) | Product information
|  | Year Ended December 31 |
|  | 2017 |
|  | NT$ |
Product |  | (In Millions) |
Wafer |  | $ | 875,461.4 |
Others |  |  | 101,985.8 |
|  | $ | 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 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | Amount |  |  | % |  |  | Amount |  |  | % |  |  | Amount |  |  | % |
|  | NT$ |  |  |  |  |  | NT$ |  |  |  |  |  | NT$ |  |  |  |
|  | (In Millions) |  |  |  |  |  | (In Millions) |  |  |  |  |  | (In Millions) |  |  |  |
Customer A |  | $ | 220,463.1 |  |  |  | 23 |  |  | $ | 224,690.7 |  |  |  | 22 |  |  | $ | 247,213.3 |  |  |  | 23 |
Customer B |  |  | 46,355.5 |  |  |  | 5 |  |  |  | 83,885.6 |  |  |  | 8 |  |  |  | 152,876.9 |  |  |  | 14 |

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- Definition The disclosure of the entity's products and services. [Refer: Products and services [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 32 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_32&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The disclosure of major customers. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_34&doctype=Standard -URIDate 2019-03-27 + Details
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