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Segment Information - Other Segment Information (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 operating segments [Line Items] |  |  |  |
Share of the profits of associates and joint ventures accounted for using equity method | $ 459 | $ 15 | $ 509 | $ 419
Interest income | 251 | 8 | 197 | 205
Interest expenses | 104 | 3 | 18 | 22
Operating costs and expenses | 166,747 |  | 171,949 | 180,706
Depreciation and amortization | 36,349 |  | 33,809 | 31,930
Capital expenditure | 24,166 | 807 | 28,550 | 26,875
Impairment loss on property, plant and equipment | 93 | 4 | 0 | 0
Reversal of impairment loss | 57 | 2 | 19 | 11
Impairment loss on intangible assets | 9 |  | 51 | 9
Impairment loss on other assets | 44 | $ 1 | 0 | 0
Domestic Fixed Communications Business [Member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Interest income | 15 |  | 18 | 21
Interest expenses | 5 |  | 0 | 0
Operating costs and expenses | 56,269 |  | 59,430 | 62,795
Depreciation and amortization | 14,842 |  | 15,027 | 15,614
Capital expenditure | 12,071 |  | 12,693 | 11,647
Impairment loss on property, plant and equipment | 0 |  |  |
Reversal of impairment loss | 57 |  | 19 | 11
Impairment loss on intangible assets | 0 |  | 0 | 0
Impairment loss on other assets | 13 |  |  |
Mobile Communications Business [Member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Interest income | 9 |  | 12 | 15
Interest expenses | 58 |  | 0 | 6
Operating costs and expenses | 72,952 |  | 73,901 | 80,275
Depreciation and amortization | 16,254 |  | 13,788 | 11,001
Capital expenditure | 7,773 |  | 10,664 | 9,742
Impairment loss on property, plant and equipment | 0 |  |  |
Impairment loss on intangible assets | 9 |  | 51 | 9
Impairment loss on other assets | 0 |  |  |
Internet Business [Member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Interest income | 20 |  | 19 | 9
Interest expenses | 1 |  | 0 | 0
Operating costs and expenses | 13,850 |  | 13,766 | 13,288
Depreciation and amortization | 2,914 |  | 3,121 | 3,385
Capital expenditure | 1,425 |  | 2,729 | 2,779
Impairment loss on property, plant and equipment | 0 |  |  |
Impairment loss on intangible assets | 0 |  | 0 | 0
Impairment loss on other assets | 13 |  |  |
International Fixed Communications Business [Member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Interest income | 41 |  | 28 | 15
Interest expenses | 12 |  | 0 | 0
Operating costs and expenses | 11,427 |  | 13,279 | 13,385
Depreciation and amortization | 1,547 |  | 1,425 | 1,477
Capital expenditure | 1,117 |  | 1,348 | 1,580
Impairment loss on property, plant and equipment | 0 |  |  |
Impairment loss on intangible assets | 0 |  | 0 | 0
Impairment loss on other assets | 0 |  |  |
Other [Member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Share of the profits of associates and joint ventures accounted for using equity method | 459 |  | 509 | 419
Interest income | 166 |  | 120 | 145
Interest expenses | 28 |  | 18 | 16
Operating costs and expenses | 12,249 |  | 11,573 | 10,963
Depreciation and amortization | 792 |  | 448 | 453
Capital expenditure | 1,780 |  | 1,116 | 1,127
Impairment loss on property, plant and equipment | 93 |  |  |
Impairment loss on intangible assets | 0 |  | $ 0 | $ 0
Impairment loss on other assets | $ 18 |  |  |

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