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Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)
Disclosure of financial assets [line items]
Less: Allowance for impairment loss	$ (2.9)		$ (8.2)
Financial assets at amortized cost	612,740.6		745,585.8
Current portion	299.9	$ 10.0	14,277.6
Noncurrent portion	7,348.9	$ 245.7	7,528.3
Corporate bonds [member]
Disclosure of financial assets [line items]
Financial assets at amortized cost	$ 7,651.7		19,520.0
Commercial paper [member]
Disclosure of financial assets [line items]
Financial assets at amortized cost			$ 2,294.1

X

- Definition

The amount of current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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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

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- Definition

The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 8
-Subparagraph f
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- Definition

The amount of non-current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

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-Number 7
-IssueDate 2019-01-01
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- Definition

Financial assets allowance for impairment losses.

+ References

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