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Available-for-sale Financial Assets - Summary of Available-for-sale Financial Assets (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | $ 98,248.5 |  | $ 71,891.3
Current portion | 93,374.2 | $ 3,150.3 | 67,788.8
Noncurrent portion | 4,874.3 | $ 164.5 | 4,102.5
Corporate bonds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 40,165.2 |  | 29,999.5
Agency bonds/Agency mortgage-backed securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 29,235.4 |  | 14,880.5
Asset-backed securities [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 13,459.5 |  | 11,254.7
Government bonds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 7,817.7 |  | 8,457.4
Publicly traded stocks [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 2,548.1 |  | 3,196.7
Non-publicly traded stocks [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 2,532.3 |  | 2,944.9
Mutual funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | 2,342.0 |  | $ 1,157.6
Commercial paper [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale | $ 148.3 |  |

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- Definition The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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