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Inventories | 12 Months Ended
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Dec. 31, 2018
Classes Of Inventories [Abstract] |
Inventories |
12. | INVENTORIES
|  | December 31 |
|  | 2017 |  |  | 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Merchandise |  | $ | 5,133 |  |  | $ | 6,068 |
Project in process |  |  | 1,390 |  |  |  | 6,756 |
Work in process |  |  | 152 |  |  |  | 109 |
Raw materials |  |  | 89 |  |  |  | 112 |
|  |  | 6,764 |  |  |  | 13,045 |
Land held under development |  |  | 1,999 |  |  |  | 1,999 |
Construction in progress |  |  | 77 |  |  |  | 77 |
|  | $ | 8,840 |  |  | $ | 15,121 |
The operating costs related to inventories were $54,183 million, $56,342 million and $48,649 million for the years ended December 31, 2016, 2017 and 2018, respectively. For the years ended December 31, 2016, 2017 and 2018, the provisions for inventory and obsolescence recognized as operating costs included the amounts of $192 million, $52 million and $365 million, respectively. As of December 31, 2017 and 2018, 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 on December 31, 2017 and 2018 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 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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