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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
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Classes Of Inventories [Abstract] |  |  |
Merchandise | $ 6,068 |  | $ 5,133
Project in process | 6,756 |  | 1,390
Work in process | 109 |  | 152
Raw materials | 112 |  | 89
Inventories subtotal | 13,045 |  | 6,764
Land held under development | 1,999 |  | 1,999
Construction in progress | 77 |  | 77
Inventories | $ 15,121 | $ 494 | $ 8,840

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- Definition Land held under development. + References No definition available. + Details
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- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_37&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition A classification of current inventory representing the amount of goods acquired for resale. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_37&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_c&doctype=Standard -URIDate 2018-03-16 + Details
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