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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Classes Of Inventories [Abstract] |  |  |
Merchandise | $ 3,858 |  | $ 6,068
Project in process | 11,113 |  | 6,756
Work in process | 141 |  | 109
Raw materials | 156 |  | 112
Inventories subtotal | 15,268 |  | 13,045
Land held under development | 1,999 |  | 1,999
Construction in progress | 77 |  | 77
Inventories | $ 17,344 | $ 580 | $ 15,121

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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 2019-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_37&doctype=Standard -URIDate 2019-03-27 + Details
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