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Available-for-sale Financial Assets - Summary of Available-for-sale Financial Assets (Detail) $ in Millions	Dec. 31, 2017 TWD ($)
Disclosure of financial assets [line items]
Financial assets available-for-sale	$ 98,248.5
Current portion	93,374.2
Noncurrent portion	4,874.3
Corporate bonds [member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	40,165.2
Agency bonds/Agency mortgage-backed securities [member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	29,235.4
Asset-backed securities [Member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	13,459.5
Government bonds [member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	7,817.7
Non-publicly traded stocks [member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	4,874.3
Publicly traded stocks [member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	2,548.1
Commercial paper [member]
Disclosure of financial assets [line items]
Financial assets available-for-sale	$ 148.3

X

- 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 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 8
-Subparagraph d
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+ References

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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 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-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
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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

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-Note Expiry date 2021-01-01
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-IssueDate 2018-01-01
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