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Financial Assets at Fair Value through Other Comprehensive Income Noncurrent - Summary of Financial Assets at Fair Value through Other Comprehensive Income Noncurrent (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
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Disclosure of financial assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | $ 6,933 | $ 226 | $ 0
Domestic listed stocks [Member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | 2,900 |  |
Domestic non-listed stocks [Member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | 3,901 |  |
Foreign non-listed stocks [Member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | $ 132 |  |

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- Definition Noncurrent financial assets at fair value through other comprehensive income. + References No definition available. + Details
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- Definition The amount of non-current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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