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v3.19.1

Net Income and Other Comprehensive Income (Loss) - Depreciation and Amortization Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Property, plant and equipment | $ 27,461 |  | $ 28,143 | $ 29,087
Investment properties | 21 |  | 21 | 19
Intangible assets | 4,386 |  | 3,766 | 3,379
Amortization of incremental costs of obtaining contracts | 1,941 | $ 63 | 0 | 0
Total depreciation and amortization expenses | 33,809 |  | 31,930 | 32,485
Depreciation expenses | 27,482 | $ 898 | 28,164 | 29,106
Amortization expenses | 6,327 |  | 3,766 | 3,379
Operating costs [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 25,996 |  | 26,402 | 27,214
Amortization expenses | 6,085 |  | 3,473 | 3,042
Operating expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 1,486 |  | 1,762 | 1,892
Marketing expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 113 |  | 154 | 173
General and administrative expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 93 |  | 104 | 126
Research and development expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | $ 36 |  | $ 35 | $ 38

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- Definition The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 128 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_128_b&doctype=Standard -URIDate 2018-03-16 + Details
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