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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Classes Of Inventories [Abstract] |  |  |
Merchandise | $ 5,133 |  | $ 4,136
Project in process | 1,390 |  | 961
Work in process | 152 |  | 109
Raw materials | 89 |  | 143
Inventories subtotal | 6,764 |  | 5,349
Land held under development | 1,999 |  | 1,999
Construction in progress | 77 |  | 75
Inventories | $ 8,840 | $ 298 | $ 7,423

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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 2016-01-13 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_37&doctype=Standard -URIDate 2016-03-31 + Details
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