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Significant Operating Lease Arrangements - Minimum Lease Payments Expensed (Detail) - TWD ($) $ in Millions | 12 Months Ended
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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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Period Type: | duration

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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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