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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 ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | $ 50,944 |  |  |
Additions-acquired separately | $ 10,935 |  |  |  |
Amortization expenses |  | (4,253) |  | $ (4,386) | $ (3,766)
Impairment losses |  | (9) | $ 0 | (51) | (9)
Ending balance |  | 47,047 | $ 1,573 | 50,944 |
Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 74,179 |  | 74,110 | 63,267
Additions-acquired separately |  | 363 |  | 498 | 11,305
Disposal |  | (10,535) |  | (429) | (462)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Others |  | 2 |  |  |
Ending balance |  | 64,009 |  | 74,179 | 74,110
Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (23,235) |  | (19,227) | (15,914)
Amortization expenses |  | (4,253) |  | (4,386) | (3,766)
Disposal |  | 10,535 |  | 429 | 462
Impairment losses |  | (9) |  | (51) | (9)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Ending balance |  | (16,962) |  | (23,235) | (19,227)
3G and 4G concession [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 49,512 |  |  |
Ending balance |  | 45,672 |  | 49,512 |
3G and 4G concession [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 70,144 |  | 70,144 | 59,209
Additions-acquired separately |  | 0 |  | 0 | 10,935
Disposal |  | (10,179) |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Others |  | 0 |  |  |
Ending balance |  | 59,965 |  | 70,144 | 70,144
3G and 4G concession [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (20,632) |  | (16,675) | (13,413)
Amortization expenses |  | (3,840) |  | (3,957) | (3,262)
Disposal |  | 10,179 |  | 0 | 0
Impairment losses |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Ending balance |  | (14,293) |  | (20,632) | (16,675)
Computer software [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 959 |  |  |
Ending balance |  | 931 |  | 959 |
Computer software [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 3,426 |  | 3,312 | 3,408
Additions-acquired separately |  | 358 |  | 485 | 366
Disposal |  | (356) |  | (371) | (462)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Others |  | 2 |  |  |
Ending balance |  | 3,430 |  | 3,426 | 3,312
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (2,467) |  | (2,432) | (2,413)
Amortization expenses |  | (388) |  | (406) | (481)
Disposal |  | 356 |  | 371 | 462
Impairment losses |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Ending balance |  | (2,499) |  | (2,467) | (2,432)
Goodwill [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 209 |  |  |
Ending balance |  | 200 |  | 209 |
Goodwill [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 236 |  | 236 | 236
Additions-acquired separately |  | 0 |  | 0 | 0
Disposal |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Others |  | 0 |  |  |
Ending balance |  | 236 |  | 236 | 236
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (27) |  | (27) | (18)
Amortization expenses |  | 0 |  | 0 | 0
Disposal |  | 0 |  | 0 | 0
Impairment losses |  | (9) |  | 0 | (9)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Ending balance |  | (36) |  | (27) | (27)
Others [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 264 |  |  |
Ending balance |  | 244 |  | 264 |
Others [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 373 |  | 418 | 414
Additions-acquired separately |  | 5 |  | 13 | 4
Disposal |  | 0 |  | (58) | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Others |  | 0 |  |  |
Ending balance |  | 378 |  | 373 | 418
Others [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (109) |  | (93) | (70)
Amortization expenses |  | (25) |  | (23) | (23)
Disposal |  | 0 |  | 58 | 0
Impairment losses |  | 0 |  | (51) | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Ending balance |  | $ (134) |  | $ (109) | $ (93)

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