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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($)
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Classes Of Inventories [Abstract] |  |  |
Merchandise | $ 3,903 |  | $ 3,858
Project in process | 6,167 |  | 11,113
Work in process | 126 |  | 141
Raw materials | 137 |  | 156
Inventories subtotal | 10,333 |  | 15,268
Land held under development | 1,999 |  | 1,999
Construction in progress | 77 |  | 77
Inventories | $ 12,409 | $ 442 | $ 17,344

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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 2020-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_37&doctype=Standard -URIDate 2020-01-01 + Details
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