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Inventories | 12 Months Ended
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Dec. 31, 2017
Classes Of Inventories [Abstract] |
Inventories |
12. | INVENTORIES
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Merchandise |  | $ | 4,136 |  |  | $ | 5,133 |
Project in process |  |  | 961 |  |  |  | 1,390 |
Work in process |  |  | 109 |  |  |  | 152 |
Raw materials |  |  | 143 |  |  |  | 89 |
|  |  | 5,349 |  |  |  | 6,764 |
Land held under development |  |  | 1,999 |  |  |  | 1,999 |
Construction in progress |  |  | 75 |  |  |  | 77 |
|  | $ | 7,423 |  |  | $ | 8,840 |
The operating costs related to inventories were $52,666 million, $54,183 million and $56,342 million for the years ended December 31, 2015, 2016 and 2017, respectively. For the years ended December 31, 2015, 2016 and 2017, the provisions for inventory and obsolescence recognized as operating costs included the amounts of $198 million, $192 million and $52 million, respectively. As of December 31, 2016 and 2017, inventories of $2,074 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, 2016 and 2017 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 2016-01-13 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2016-03-30&anchor=sect_Disclosure&doctype=Standard -URIDate 2016-03-31 + Details
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