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Inventories | 12 Months Ended
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Dec. 31, 2019
Classes Of Inventories [Abstract] |
Inventories |
1 1. | INVENTORIES
|  | December 31 |
|  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Merchandise |  | $ | 6,068 |  |  | $ | 3,858 |
Project in process |  |  | 6,756 |  |  |  | 11,113 |
Work in process |  |  | 109 |  |  |  | 141 |
Raw materials |  |  | 112 |  |  |  | 156 |
|  |  | 13,045 |  |  |  | 15,268 |
Land held under development |  |  | 1,999 |  |  |  | 1,999 |
Construction in progress |  |  | 77 |  |  |  | 77 |
|  | $ | 15,121 |  |  | $ | 17,344 |
The operating costs related to inventories were $56,342 million, $48,649 million and $49,258 million for the years ended December 31, 2017, 2018 and 2019, respectively. For the years ended December 31, 2017, 2018 and 2019, valuation loss on inventories recognized as operating costs included the amounts of $52 million, $365 million and $475 million, respectively. As of December 31, 2018 and 2019, inventories of $2,076 million and $2,076 million, respectively, were expected to be recovered for a time period longer than twelve months. The aforementioned amount of inventories is related to property development owned by LED. Land held under development and construction in progress was developed by LED for Qingshan Sec., Dayuan Dist., Taoyuan City project.

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- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS02_g36-39_TI -URIDate 2019-03-27 + Details
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