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Operating Segments Information - Geographic Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | $ 977,447.2 | $ 32,977.3 | $ 947,938.3 | $ 843,497.4
Non-current Assets | 1,079,700.6 |  | 1,013,892.9 |
Taiwan [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | 90,129.4 |  | 127,063.0 | 90,169.5
Non-current Assets | 1,027,963.2 |  | 991,567.9 |
United States [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | 620,948.7 |  | 610,371.1 | 566,600.2
Non-current Assets | 7,515.9 |  | 8,245.0 |
Asia [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | 194,477.1 |  | 146,907.4 | 123,705.9
Non-current Assets | 44,213.4 |  | 14,071.3 |
Europe, the Middle East and Africa [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | 68,538.3 |  | 58,042.3 | 57,065.0
Non-current Assets | 8.1 |  | 8.7 |
Others [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | $ 3,353.7 |  | $ 5,554.5 | $ 5,956.8

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