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Significant Operating Lease Arrangements - Minimum Lease Payments Expensed (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of finance lease and operating lease by lessee [abstract]
Minimum lease payments	$ 4,243.1	$ 2,178.1	$ 1,135.7

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- References

No definition available.

+ Details

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- Definition

The amount of expense recognised on rental activities.

+ 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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Period Type:	duration