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Net Revenue - Summary of Net Revenue (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure Of Net Revenue [Abstract] |  |  |  |
Net revenue from sale of goods | $ 976,923.2 |  | $ 947,415.9 | $ 842,997.6
Net revenue from royalties | 524.0 |  | 522.4 | 499.8
Net revenue | $ 977,447.2 | $ 32,977.3 | $ 947,938.3 | $ 843,497.4

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