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v3.20.1

Net Income and Other Comprehensive Income (Loss) - Depreciation and Amortization Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Property, plant and equipment | $ 26,930 |  | $ 27,461 | $ 28,143
Right-of-use assets | 3,968 |  | 0 | 0
Investment properties | 25 |  | 21 | 21
Intangible assets | 4,253 |  | 4,386 | 3,766
Incremental costs of obtaining contracts | 1,173 | $ 39 | 1,941 | 0
Total depreciation and amortization expenses | 36,349 |  | 33,809 | 31,930
Depreciation expenses | 30,923 | $ 1,034 | 27,482 | 28,164
Amortization expenses | 5,426 |  | 6,327 | 3,766
Operating costs [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 28,957 |  | 25,996 | 26,402
Amortization expenses | 5,196 |  | 6,085 | 3,473
Operating expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 1,966 |  | 1,486 | 1,762
Marketing expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 96 |  | 113 | 154
General and administrative expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 95 |  | 93 | 104
Research and development expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | $ 39 |  | $ 36 | $ 35

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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 2019-01-01 -Paragraph 128 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_128_b&doctype=Standard -URIDate 2019-03-27 + Details
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