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Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | $ 47,353 |  |  |
Additions-acquired separately | $ 10,935 | $ 9,955 |  |  |  |
Amortization expenses |  |  | (3,766) |  | $ (3,379) | $ (3,080)
Impairment losses |  |  | (9) | $ 0 | 0 | 0
Ending balance |  |  | 54,883 | $ 1,852 | 47,353 |
Gross carrying amount [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 63,267 |  | 63,103 | 52,778
Additions-acquired separately |  |  | 11,305 |  | 282 | 10,380
Disposal |  |  | (462) |  | (121) | (377)
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  |  |  | 314
Others |  |  |  |  | 3 | 8
Ending balance |  | 63,103 | 74,110 |  | 63,267 | 63,103
Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | (15,914) |  | (12,656) | (9,953)
Amortization expenses |  |  | (3,766) |  | (3,379) | (3,080)
Disposal |  |  | 462 |  | 121 | 377
Impairment losses |  |  | (9) |  | 0 |
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Others |  |  |  |  |  | 0
Ending balance |  | (12,656) | (19,227) |  | (15,914) | (12,656)
3G and 4G concession [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 45,796 |  |  |
Ending balance |  |  | 53,469 |  | 45,796 |
3G and 4G concession [Member] | Gross carrying amount [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 59,209 |  | 59,209 | 49,254
Additions-acquired separately |  |  | 10,935 |  | 0 | 9,955
Disposal |  |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  |  |  | 0
Others |  |  |  |  | 0 | 0
Ending balance |  | 59,209 | 70,144 |  | 59,209 | 59,209
3G and 4G concession [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | (13,413) |  | (10,608) | (8,104)
Amortization expenses |  |  | (3,262) |  | (2,805) | (2,504)
Disposal |  |  | 0 |  | 0 | 0
Impairment losses |  |  | 0 |  | 0 |
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Others |  |  |  |  |  | 0
Ending balance |  | (10,608) | (16,675) |  | (13,413) | (10,608)
Computer software [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 995 |  |  |
Ending balance |  |  | 880 |  | 995 |
Computer software [Member] | Gross carrying amount [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 3,408 |  | 3,249 | 3,192
Additions-acquired separately |  |  | 366 |  | 277 | 424
Disposal |  |  | (462) |  | (121) | (375)
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  |  |  | 0
Others |  |  |  |  | 3 | 8
Ending balance |  | 3,249 | 3,312 |  | 3,408 | 3,249
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | (2,413) |  | (1,983) | (1,793)
Amortization expenses |  |  | (481) |  | (551) | (565)
Disposal |  |  | 462 |  | 121 | 375
Impairment losses |  |  | 0 |  | 0 |
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Others |  |  |  |  |  | 0
Ending balance |  | (1,983) | (2,432) |  | (2,413) | (1,983)
Goodwill [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 218 |  |  |
Ending balance |  |  | 209 |  | 218 |
Goodwill [Member] | Gross carrying amount [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 236 |  | 236 | 181
Additions-acquired separately |  |  | 0 |  | 0 | 0
Disposal |  |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  |  |  | 55
Others |  |  |  |  | 0 | 0
Ending balance |  | 236 | 236 |  | 236 | 236
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | (18) |  | (18) | (18)
Amortization expenses |  |  | 0 |  | 0 | 0
Disposal |  |  | 0 |  | 0 | 0
Impairment losses |  |  | (9) |  | 0 |
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Others |  |  |  |  |  | 0
Ending balance |  | (18) | (27) |  | (18) | (18)
Others [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 344 |  |  |
Ending balance |  |  | 325 |  | 344 |
Others [Member] | Gross carrying amount [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 414 |  | 409 | 151
Additions-acquired separately |  |  | 4 |  | 5 | 1
Disposal |  |  | 0 |  | 0 | (2)
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  |  |  | 259
Others |  |  |  |  | 0 | 0
Ending balance |  | 409 | 418 |  | 414 | 409
Others [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | (70) |  | (47) | (38)
Amortization expenses |  |  | (23) |  | (23) | (11)
Disposal |  |  | 0 |  | 0 | 2
Impairment losses |  |  | 0 |  | 0 |
Effect of foreign exchange difference |  |  | 0 |  | 0 | 0
Others |  |  |  |  |  | 0
Ending balance |  | $ (47) | $ (93) |  | $ (70) | $ (47)

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