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Financial Assets at Amortized Cost-2018 - Schedule of Financial Assets at Amortized Cost (Detail) - Dec. 31, 2018 $ in Millions, $ in Millions	TWD ($)	USD ($)
Disclosure of financial assets [line items]
Less: Allowance for impairment loss	$ (8.2)
Financial assets at amortized cost	21,805.9
Current portion	14,277.6	$ 466.4
Noncurrent portion	7,528.3	$ 245.9
Corporate bonds [member]
Disclosure of financial assets [line items]
Financial assets at amortized cost	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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- 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 2018-01-01
-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 2018-01-01
-Paragraph 8
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- Definition

Financial assets allowance for impairment losses.

+ References

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