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Other Income - Summary of Other Income (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of other income [abstract] |  |  |  |
Bank deposits | $ 10,310.7 |  | $ 6,412.8 | $ 4,892.6
Financial assets at FVTPL | 382.7 |  |  |
Financial assets at FVTOCI | 3,078.6 |  |  |
Financial assets at amortized cost | 922.4 |  |  |
Available-for-sale financial assets |  |  | 2,091.4 | 816.2
Held-to-maturity financial assets |  |  | 568.6 | 383.3
Structured product |  |  | 391.9 | 225.4
Interest income | 14,694.4 | $ 480.0 | 9,464.7 | 6,317.5
Dividend income | 158.4 | 5.2 | 145.6 | 137.4
Other income | $ 14,852.8 | $ 485.2 | $ 9,610.3 | $ 6,454.9

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- Definition The amount of income associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of revenue arising from interest for financial assets that are measured at amortised cost. [Refer: Interest income; Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_20_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of interest income on available-for-sale financial assets. [Refer: Interest income; Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_112_c&doctype=Standard&book=b_pdf -URIDate 2018-03-16 + Details
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- Definition The amount of interest income on deposits. [Refer: Interest income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of interest income on financial assets designated at fair value through profit or loss. [Refer: Interest income; Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of interest income on held-to-maturity investments. [Refer: Interest income; Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_112_c&doctype=Standard&book=b_pdf -URIDate 2018-03-16 + Details
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- Definition The amount of interest revenue arising on financial assets measured at fair value through other comprehensive income. [Refer: Revenue; Financial assets measured 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 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_20_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of income arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_c&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_e&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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