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v3.21.1

Net Income - Depreciation and Amortization Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Property, plant and equipment | $ 26,989 |  | $ 26,930 | $ 27,461
Right-of-use assets | 3,931 |  | 3,968 | 0
Investment properties | 22 |  | 25 | 21
Intangible assets | 5,424 |  | 4,253 | 4,386
Incremental costs of obtaining contracts | 772 | $ 27 | 1,173 | 1,941
Total depreciation and amortization expenses | 37,138 |  | 36,349 | 33,809
Depreciation expenses | 30,942 | $ 1,102 | 30,923 | 27,482
Amortization expenses | 6,196 |  | 5,426 | 6,327
Operating costs [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 29,056 |  | 28,957 | 25,996
Amortization expenses | 5,971 |  | 5,196 | 6,085
Operating expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 1,886 |  | 1,966 | 1,486
Marketing expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 100 |  | 96 | 113
General and administrative expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 82 |  | 95 | 93
Research and development expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | $ 43 |  | $ 39 | $ 36

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