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Segment Information - Geographic Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of geographical areas [Line Items] |  |  |  |
Revenues | $ 215,483 | $ 7,040 | $ 227,514 | $ 229,991
Taiwan, ROC [Member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenues | 205,696 |  | 217,568 | 218,933
Overseas [Member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenues | $ 9,787 |  | $ 9,946 | $ 11,058

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